CN110575282A

CN110575282A - Structure for covered stent and covered stent

Info

Publication number: CN110575282A
Application number: CN201910918659.8A
Authority: CN
Inventors: 潘宁; 陆信武; 叶开创; 秦金宝; 赵中
Original assignee: Hangzhou Xinqiao Medical Technology Co Ltd
Current assignee: Hangzhou Xinqiao Medical Technology Co Ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2019-12-17
Also published as: CN111870393A

Abstract

the application discloses tectorial membrane support is with structure and tectorial membrane support includes: the outer layer film, the metal bracket main body and the inner layer film are sequentially distributed from outside to inside; a cavity is formed between the outer layer film and the inner layer film and used for placing the metal bracket main body; the thickness of the cavity is greater than the thickness of the metal support body, and the metal support body is movable in the cavity. The technical scheme of the application has the following beneficial effects: 1. the blood vessel type and the size of a patient do not need to be customized, and mass production can be easily realized; 2. the open pore position of the covered stent is completely matched with the branches of the patient, so that the blood flow of the branches is not influenced; 3. the operation is easy, the operation time is short, and the operation complication is not easy to generate; 4. the internal leakage at the joint of the branch and the main body is reduced; 5. preventing the branch stent from shifting.

Description

Structure for covered stent and covered stent

Technical Field

the application relates to the technical field of medical equipment, in particular to a structure for a covered stent and a covered stent.

Background

Thoracic aortic aneurysm refers to aneurysm occurring in aortic sinus, ascending aorta, aortic arch or descending aorta, and is an abnormal expansion, deformation, or neoplastic protrusion of the thoracic aorta. The thoracic aorta is irreversibly dilated or expanded locally or at multiple positions due to various reasons to form a "tumor-like" mass, which is called aneurysm. Aneurysms are classified into true aneurysms, pseudoaneurysms, and aortic dissections. The covered stent can be mainly used for plugging a crevasse and has the effect of treating aortic aneurysm. When the crevasse position is at the far end of the left clavicle position, the conventional straight tube type covered stent can be used for plugging, when the crevasse position is at the initiative arch part or the aorta ascending part, due to the lack of an anchoring area, if the conventional straight tube type covered stent is used, a branch blood vessel can be plugged, and the currently researched covered stent scheme for the aortic ascending part or the arch part lesion is mainly a branch type covered stent and an open pore type covered stent.

In the prior art, there are two types of stents that are common:

scheme 1: a branch type covered stent. This type of branch stent is mainly customized according to the aortic arch. The main defects are as follows: because the individual difference of the blood vessels of patients is large, the angles and the sizes of the blood vessels are numerous, the mass production is not suitable, and meanwhile, because the stent is provided with branches, the required delivery sheath is also large, the stent is not suitable for most cases.

Scheme 2: and (5) opening a hole to cover the stent. The main defects are as follows: the type of covered stent is similar to a branch type covered stent, the individual difference of different patients is large, the angle change of blood vessels is more, the type of covered stent is not suitable for mass production, and meanwhile, when the stent is implanted, the opening position of the covered stent is not easy to align the branch blood vessels, and certain influence is caused on the branched blood flow.

disclosure of Invention

In order to solve the technical problem, the embodiment of the application provides a structure for a covered stent and a covered stent.

The first aspect of the embodiment of the application provides a tectorial membrane structure for support, adopts columnar structure, includes:

The outer layer film, the metal bracket main body and the inner layer film are sequentially distributed from outside to inside;

a cavity is formed between the outer layer film and the inner layer film and used for placing the metal bracket main body;

the thickness of the cavity is greater than the thickness of the metal holder body, and the metal holder body is movable in the cavity.

Further, the outer layer film employs: e-PTFE or FEP or PET or silica gel.

Further, the inner layer film employs: e-PTFE or FEP or PET or silica gel.

Furthermore, a plurality of connecting units are arranged between the outer layer film and the inner layer film.

furthermore, a section is made along the central line of the columnar structure, the section shapes of the outer layer film and the inner layer film are straight lines, and the height of the connecting unit is consistent with the height between the outer layer film and the inner layer film.

Furthermore, a section is made along the central line of the columnar structure, the shapes of the sections of the outer layer film and the inner layer film are wavy lines, and the height of the connecting unit is not consistent with the height between the outer layer film and the inner layer film.

A second aspect of embodiments of the present application provides a stent graft, comprising:

a first stent section as a stent proximal end which is first inserted into a blood vessel;

The second bracket part is used as the middle section of the bracket and is connected with the branch bracket;

A third support part as a support far end connected with the conveyor;

The first and third bracket parts include:

the outer layer film, the metal bracket main body and the inner layer film are sequentially distributed from outside to inside; the metal bracket main body is fixed between the outer layer film and the inner layer film;

the second stent part consists of the structure for the covered stent;

the first bracket part, the second bracket part and the third bracket part are connected with each other through respective outer layer films and inner layer films.

Further, the connection units are evenly distributed in the second bracket part.

Further, the connection units are distributed at both ends of the second leg portion.

Further, in the second bracket part, the inner film covers at least a position where the connection unit is located.

the technical scheme of the application has the following beneficial effects: 1. the blood vessel type and the size of a patient do not need to be customized, and mass production can be easily realized; 2. the open pore position of the covered stent is completely matched with the branches of the patient, so that the blood flow of the branches is not influenced; 3. the operation is easy, the operation time is short, and the operation complication is not easy to generate; 4. the internal leakage at the joint of the branch and the main body is reduced; 5. preventing the branch stent from shifting.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a stent structure of the present application;

FIG. 2 is a perspective view of the present application with the outer layer film removed;

FIG. 3 is an overall block diagram of the present application;

FIG. 4 is an active view of the stent body;

FIG. 5 is a block diagram of a second bracket portion;

fig. 6 is a structural view of another second holder portion.

the meaning of the reference symbols in the figures:

101-a first stent part, 102-a second stent part, 103-a third stent part, a-an active region, 10-an outer membrane, 20-an inner membrane, 30-a metal stent main body, and 40-a connecting unit.

Detailed Description

In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, 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 application.

The technical scheme of the application is further explained by the specific implementation mode in combination with the attached drawings.

in the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

The covered stent in the application consists of a Niti stent section, an e-PTFE covering film, an FEP covering film and other materials, the whole structure is divided into three parts, and the first part and the third part are positioned at the near end and the far end of the covered stent, namely a first stent part and a third stent part.

in this embodiment, the stent body of the first and third stent sections is positioned intermediate the double layer of e-PTFE cover, which is primarily used for proximal and distal sealing. First support portion and third support portion can adopt current structure, also can adopt the structure for the support in this application, and the difference is, the inside metal support of first support portion and third support portion does not have the mobility, and three support portion is connected through the outer rete on respective surface, when the inner layer rete of second support portion adopted the form of full coverage, also can be with inside inner layer rete interconnect.

the second stent section is located between the e-PTFE film and the FEP film, and is mainly used for branch perforation. In this embodiment, through a special processing technology, the second stent part can move between the e-PTFE coating and the FEP coated stent, and when the balloon is expanded, the stent section can move between the two layers of coatings, so that interference of the stent section on a branch stent at a drilling position is avoided.

In the present application, in order to realize the movement of the stent, the stent is considered to be connected by stent units, and the stent is formed into a structure similar to a framework, rather than a surface. Therefore, the outer layer film and the inner layer film are provided with a plurality of connecting units in the second stent portion. The connecting unit can be in two modes, one mode is that the outer layer film and the inner layer film are connected at certain positions through the built-in structure, and the connecting parts are distributed on two sides of the bracket and cannot be located on the same side of the bracket unit, otherwise, the connecting unit can limit one side. In the second mode, certain positions of the outer layer film and the inner layer film are directly connected without an external structure by directly adopting a process shaping mode, so that the formed interface of the outer layer film and the inner layer film is similar to a wave shape, and the requirement of the connection position is the same as that of the first mode.

As shown in fig. 2, a plurality of connection units are arranged between the outer layer film and the inner layer film, and the connection units are directly in a tubular structure.

the utility model provides a structure is arranged in supporting blood vessel in the artery, consider the deformity of blood vessel, through putting into established position with this structural support after, outer tunica adventitia and the inner tunica adventitia of second support portion are punctured through specific puncture structure, utilize the sacculus to expand this position, because after whole structure expansion, it can influence because of deformation to beat the sky position at this, lead to the support can direct interference to branch's support, but the structure in this application can make the support section have certain displacement distance, can remove between two-layer tectorial membrane, avoid the support section to the interference of the branch's support of punching the position.

in order to deal with the deformation problem of stent expansion, the FEP coating in the second stent part does not need to be completely covered, and only 2/3 stent sections are covered in the embodiment, so that the flexibility of the stent can be improved when the stent is bent.

in the present application, the stent material is not limited to NITI, and stainless steel, cobalt-chromium alloy, or the like may be used. The coating material is not limited to e-PTFE and FEP, and materials such as PET and silicone rubber may be used.

The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. A structure for a covered stent adopts a columnar structure and is characterized in that,

The structure for a stent graft includes:

The thickness of the cavity is greater than the thickness of the metal support body, and the metal support body is movable in the cavity.

2. The structure for a stent graft according to claim 1, wherein,

the outer layer film adopts: e-PTFE or FEP or PET or silica gel.

3. The structure for a stent graft according to claim 1, wherein,

the inner layer film adopts the following steps: e-PTFE or FEP or PET or silica gel.

4. the structure for a stent graft according to claim 1, wherein,

And a plurality of connecting units are arranged between the outer layer film and the inner layer film.

5. The structure for a stent graft according to claim 4,

And a section is made along the central line of the columnar structure, the sections of the outer layer film and the inner layer film are straight lines, and the height of the connecting unit is consistent with the height between the outer layer film and the inner layer film.

6. the structure for a stent graft according to claim 4,

and a section is made along the central line of the columnar structure, the sections of the outer layer film and the inner layer film are wavy lines, and the height of the connecting unit is not consistent with the height between the outer layer film and the inner layer film.

7. A covered stent is characterized in that,

The stent graft includes:

A third support part as a support far end connected with the conveyor;

the first and third leg portions include:

The second stent section is composed of the structure for a stent graft according to claim 4;

the first support part, the second support part and the third support part are connected with each other through respective outer layer films and inner layer films.

8. the stent graft of claim 7,

the connecting units are evenly distributed in the second bracket part.

9. the stent graft of claim 7 or 8,

The connecting units are distributed at two ends of the second bracket part.

10. the stent graft of claim 7,

In the second bracket part, the inner film covers at least the position where the connection unit is located.