CN212382692U

CN212382692U - Novel close net support

Info

Publication number: CN212382692U
Application number: CN202021909803.6U
Authority: CN
Inventors: 吴重草; 刘振全; 贾晶; 孙冰
Original assignee: Jiangsu Nuanyang Medical Instruments Co ltd
Current assignee: Jiangsu Nuanyang Medical Instruments Co ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2021-01-22
Anticipated expiration: 2030-09-04

Abstract

The invention discloses a novel dense net bracket, which comprises a bracket; the stent is a tubular braided fabric, and rhombic meshes are formed among braided wires; the diameters of the two ends of the support are larger than the diameter of the middle section, and the weaving density of the two ends is different from that of the middle section. The dense mesh stent has the beneficial effects that mesh densities and diameters of meshes at different positions of the stent are different, so that the anchoring performance of the stent is effectively improved while effective occlusion of a tumor body and no influence on branch blood vessels are ensured.

Description

Novel close net support

Technical Field

The invention relates to the technical field of medical instrument implants, in particular to a novel dense net support.

Background

Intracranial aneurysm is a local abnormality of cerebral artery formed due to dysplasia or injury, and has quite high risk, and once a tumor body is ruptured, sudden death or disability is easily caused, and the incidence rate of intracranial aneurysm in people reaches 2-7% by statistics. Endovascular intervention is a common treatment for intracranial aneurysms, which includes aneurysm occlusion, intraluminal embolization, and parent artery reconstruction. The blood flow guiding device is a current-carrying artery reconstruction device, and can induce the formation of thrombus in the aneurysm and promote the epithelial hyperplasia at the neck of the aneurysm by reducing the blood flow between the aneurysm body and the current-carrying artery, thereby realizing the function of treating the aneurysm.

The choice of the blood flow directing device, i.e. the dense mesh stent, should take into account a number of factors, in particular the mesh fraction and the stent diameter. The mesh rate influences the blood exchange efficiency between the tumor body and the current-carrying artery, and at the tumor neck, the mesh density as high as possible can ensure that the tumor body is effectively blocked; the density of the branch blood vessels is not too high, and the normal circulation of blood needs to be ensured, otherwise complications are easily induced, and the prognosis is reduced. The diameter of the stent is matched with the inner diameter of a blood vessel, poor adherence is easily caused when the diameter is too small, and then displacement or shortening are generated; too large a diameter can result in stent overstretching reducing mesh density and potentially difficult distal opening.

Disclosure of Invention

1. Technical problem to be solved

The technical problem to be solved by the invention is to provide a novel dense mesh stent, which is realized by the non-uniform distribution of mesh rate and diameter, and effectively improves the anchoring performance of the stent while ensuring effective occlusion of a tumor body and no influence on branch blood vessels.

2. Technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a novel dense net support comprises a support; the stent is a tubular braided fabric, and rhombic meshes are formed among braided wires; the diameters of the two ends of the support are larger than the diameter of the middle section, and the weaving density of the two ends is different from that of the middle section.

The novel dense-mesh stent is characterized in that the ratio of the weaving density of the two ends of the stent to the weaving density of the middle section of the stent is 1: 10-10: 1.

The novel dense mesh stent is characterized in that the weaving density of the positions with the same diameter of the stent is the same; the reducing position of the support is one or a combination of bell shape, truncated spherical shape and truncated conical shape.

The novel dense net support is characterized in that the diameter of the support is 2-50 mm, and the length of the support is 10-500 mm.

The novel dense mesh stent is a single-layer or multi-layer tubular braided fabric, and one or more braided wires are provided.

In the above novel dense mesh stent, the braided wire is made of an elastic material or a memory material, including but not limited to one or more of metal, alloy, and polymer material. Metal or alloy materials include, but are not limited to, stainless steel, platinum-tungsten alloy, platinum-iridium alloy, nickel-titanium alloy, or cobalt-chromium alloy; polymeric materials include, but are not limited to, polyethylene, polyoxymethylene, polyurethane, polyester, polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polyamide, polyimide, or nylon.

3. Advantageous effects

In conclusion, the beneficial effects of the invention are as follows: the dense mesh stent has different mesh densities and diameters at different positions of the stent, ensures effective occlusion of tumor bodies and does not influence branch vessels, and effectively improves the anchoring performance of the stent.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:

FIG. 1 is a schematic structural diagram of the novel dense net support;

FIG. 2 is one embodiment of the present novel dense mesh stent for aneurysm treatment;

FIG. 3 is one embodiment of the present novel dense mesh stent for aneurysm treatment;

FIG. 4 is a schematic view of the dense mesh support with a bell-shaped diameter-variable structure;

FIG. 5 is a schematic view of the dense net support with truncated spherical diameter change;

fig. 6 is a schematic view of the conical frustum diameter-changing of the dense net support.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In actual operation, the dense mesh stent at the middle section is placed at the neck of an aneurysm, and the mesh density as high as possible can ensure that the aneurysm is effectively blocked; the branch blood vessels on the two sides need to ensure the normal circulation of blood, and the mesh density of the stent is not too high. As in fig. 1, the mesh density of the dense mesh stent varies in the axial direction, wherein: the ratio of the weaving density at the two ends to the weaving density in the middle is at least 10% and at most 1000%, preferably, the wide diameter sections at the two ends have a low mesh density and the middle section has a higher mesh density. The novel dense mesh stent is divided into five sections from the far end to the near end according to the relative position specifically used in the operation, the length of the novel dense mesh stent is marked as L1-L5, and the diameter of the novel dense mesh stent is marked as D1-D5. The ratio of the L3 to the total length of the bracket is at least 10% and at most 98%, and the lengths of the L1, the L2, the L4 and the L5 can be adjusted according to any proportion according to actual requirements. The diameters of the five parts can be equal or different from each other, the ratio of D1 to D3 or D5 to D3 is at least 100% and at most 150%, when D1 is equal to D3 or D3 is equal to D5, the middle sections D2 or D4 of the two parts are of an equal-diameter structure, otherwise, the five parts are of a continuous variable-diameter structure; when D1 is not equal to D3, or D3 is not equal to D5, it is preferred that the ends have a larger diameter than the middle section.

Furthermore, on the premise that the diameter of the stent is matched with the inner diameter of a blood vessel and the stent can adhere well to the wall, the diameters D1 and D5 on the two sides of the stent are slightly larger, so that the anchoring property of the stent can be improved, the stent can be better positioned in the blood vessel, and displacement or shortening are avoided.

Further, the stent of the dense-mesh stent and the wide-diameter parts at two sides of the dense-mesh stent has larger stretching degree in the blood vessel, thereby further reducing the mesh density at two ends.

As shown in FIG. 2, a possible embodiment of the dense mesh stent is in a blood vessel, in the illustrated case, one side of the blood vessel wall has a raised aneurysm, and two sides of the aneurysm body have branch blood vessels respectively; at the moment, the dense mesh part in the middle of the dense mesh stent completely covers the tumor neck, and the branch blood vessels are covered by the non-dense mesh areas on the two sides of the stent or are positioned outside the stent covering area. Furthermore, the brackets with the wide-diameter parts at the two ends are tightly anchored with the vessel wall and are not easy to slip.

Fig. 3 shows a modified embodiment of the dense mesh stent of fig. 1, which comprises only a wide section with a low mesh rate and a narrow section with a high mesh rate, which are connected by a variable diameter section. In the illustrated case, there is a raised aneurysm on the vessel wall side, and a branch vessel on the tumor body side; at the moment, the dense mesh part in the middle of the dense mesh stent completely covers the tumor neck and the branch blood vessel and is covered by the non-dense mesh area on one side of the stent or is positioned outside the stent covering area.

As shown in fig. 4, the dense mesh stent has several possible shapes of the wide-diameter and narrow-diameter connecting sections, (a) a bell shape, (b) a truncated spherical shape, and (c) a truncated conical shape. Furthermore, the shape of the connecting section can be one or a combination of several of the shapes. Further, the mesh density of the connecting section can be the same as that of one of the two ends, or between the two, or gradually changed from high density section to low density section from large to small.

Further, the diameter of the support is 2-50 mm, and the length of the support is 10-500 mm; the knitted fabric is a single-layer, double-layer or multi-layer knitted fabric formed by knitting or weaving filamentous materials, the knitted material is an elastic material or a memory material, and is usually formed by matching one or more of metal, alloy and high polymer materials, and the knitting silk can be a single or a plurality of threads; can be formed by one-time weaving or by combining multiple sections of fabrics after being woven respectively.

Further, the dense mesh stent may be embodied to be implanted in a blood vessel in cooperation with an associated delivery system, and is generally a device comprising a series of elements such as a sheath, a guide wire, a microcatheter pushing member, etc., which are well known to those skilled in the art and can be operated and used in accordance with the prior art.

Further, the shape of the stent is determined by designing the shape of the braiding mandrel; the weaving density of the stent is determined by the design of the weaving process.

Furthermore, the forming process and the performance of the dense net support are easy to control and guarantee.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A novel close net support which is characterized in that: comprises a bracket; the stent is a tubular braided fabric, and rhombic meshes are formed among braided wires; the diameters of the two ends of the support are larger than the diameter of the middle section, and the weaving density of the two ends is different from that of the middle section.

2. The novel dense net support of claim 1, wherein: the ratio of the weaving density of the two ends of the support to the weaving density of the middle section of the support is 1: 10-10: 1.

3. The novel dense net support of claim 1, wherein: the weaving density of the positions with the same diameter of the stent is the same; the reducing position of the support is one or a combination of bell shape, truncated spherical shape and truncated conical shape.

4. The novel dense net support of claim 1, wherein: the diameter of the support is 2-50 mm, and the length of the support is 10-500 mm.

5. The novel dense net support of claim 1, wherein: the stent is a single-layer or multi-layer tubular braided fabric, and one or more braided wires are used.