CN212679343U

CN212679343U - Covered stent

Info

Publication number: CN212679343U
Application number: CN202022206982.3U
Authority: CN
Inventors: 李爽; 汪泽辉; 夏洁
Original assignee: Suzhou Zhongtian Medical Device Technology Co ltd
Current assignee: Suzhou Zhongtian Medical Device Technology Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-03-12
Anticipated expiration: 2030-09-30

Abstract

The utility model belongs to the technical field of medical instrument, concretely relates to tectorial membrane support. The stent graft includes a stent body having a proximal end and a distal end, the proximal end being disposed upstream of the blood vessel relative to the distal end, and a membrane. The film is arranged and covered on the bracket body, the surface of the film is provided with a plurality of openings, and the openings face to the near end or the far end of the bracket body. The utility model discloses a behind the Y type bifurcation department of support body installation to carotid, the support body opens, and the film opens along with the support body, and the film covers the plaque in the blood vessel to can prevent that the plaque from breaking because of the extrusion of support body and droing. In addition, after the stent body is installed to the common carotid artery and the internal carotid artery, the blood flow entering the external carotid artery from the common carotid artery easily washes away the film at the entrance of the external carotid artery, thereby ensuring that the blood normally enters the external carotid artery. To sum up, the utility model discloses a tectorial membrane support's safety in utilization is better.

Description

Covered stent

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to tectorial membrane support.

Background

Cerebrovascular disease is today a major disease threatening human health, second only to cardiovascular disease and the third leading cause of death of tumors, where 25% of ischemic strokes are associated with carotid stenosis or occlusion.

The treatment of carotid stenosis is mainly divided into drug treatment, carotid endarterectomy and carotid stenting. Among them, carotid artery stent implantation has the advantages of simple operation, small wound and few complications, and is one of the effective methods for treating carotid artery stenosis at present.

The carotid artery is divided into a common carotid artery, an external carotid artery and an internal carotid artery, the common carotid artery, the external carotid artery and the internal carotid artery are Y-shaped bifurcation structures, the blood flow of the common carotid artery flows into the internal carotid artery and the external carotid artery respectively at the bifurcation sites, wherein the blood of the internal carotid artery mainly flows to the brain, and the blood of the external carotid artery mainly supplies facial organs.

Common carotid stents at present are bare stents and covered stents. After the carotid artery stent is placed on the common carotid artery and the internal carotid artery, the carotid artery stent is expanded, so that a narrow blood vessel is expanded, and the carotid artery restores normal blood supply.

The existing naked stent is usually in a tubular structure formed by laser cutting or metal wire weaving, the meshes of the naked stent are large, when the naked stent is released at a carotid artery narrow part, a stent rod easily generates cutting action on plaques, the plaques are broken and fall off, the fallen broken plaques can enter the brain along with blood flow, and then cerebral vessels are blocked, stroke is caused, and even death is caused.

The existing covered stent is arranged at the Y-shaped bifurcation structure of the carotid artery, and the film of the covered stent easily covers the inlet of the external carotid artery, so that the external carotid artery is ischemic, and the blood supply of facial organs is influenced.

In conclusion, the existing carotid artery stent has lower safety.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a covered stent to solve the lower problem of current carotid artery support security.

To achieve the purpose, the utility model adopts the following technical proposal:

a stent graft, comprising:

a stent body having a proximal end and a distal end, the proximal end being for placement upstream of a blood vessel relative to the distal end;

the thin film is installed on and covers the support body, a plurality of openings are formed in the surface of the thin film, and the openings face the near end or the far end of the support body.

Preferably, in the stent graft described above, the thin film forms the openings by a laser cutting method.

Preferably, in the stent graft above, a plurality of groups of openings are sequentially arranged in the length direction of the thin film, each group of openings has a plurality of openings, and the plurality of openings of each group of openings are continuously distributed along the circumferential direction of the thin film.

Preferably, in the above-mentioned stent graft, the opening has a semicircular structure.

Preferably, in the above-mentioned stent graft, the opening has a rectangular structure.

Preferably, in the above-mentioned stent graft, the opening has a triangular structure.

Preferably, in the stent graft described above, the thin film has a single-layer structure.

Preferably, in the stent graft above, the thin film has a two-layer structure, and the openings of the two layers of thin films have an overlapping region therebetween.

Preferably, in the stent graft above, the thin film has a two-layer structure, and the closed end of the opening of the thin film of the outer layer is laminated to the open end of the opening of the thin film of the inner layer.

Preferably, in the stent graft above, the stent body is a cylindrical or conical-cylindrical structure formed by laser cutting a medical metal tube or weaving a medical metal wire.

The utility model discloses a tectorial membrane support's beneficial effect lies in:

after the stent body is arranged at the Y-shaped bifurcation of the carotid artery, the stent body is opened, the film is opened along with the stent body and covers plaques in the blood vessel, so that the plaques can be prevented from being broken and falling off due to the extrusion of the stent body.

In addition, after the stent body is installed to the common carotid artery and the internal carotid artery, the blood flow entering the external carotid artery from the common carotid artery easily washes away the film at the entrance of the external carotid artery, thereby ensuring that the blood normally enters the external carotid artery.

To sum up, the utility model discloses a tectorial membrane support's safety in utilization is better.

Drawings

FIG. 1 is a schematic diagram of carotid arteries according to embodiments 1 and 2 of the present invention;

FIG. 2 is a structural diagram of a stent graft according to example 1 of the present invention;

FIG. 3 is a structural diagram of a first single-layer film of a stent graft according to example 1 of the present invention;

FIG. 4 is a structural diagram of a second single-layer film of a stent graft according to example 1 of the present invention;

FIG. 5 is a structural view of a third single-layer film of a stent graft according to example 1 of the present invention;

FIG. 6 is a structural diagram of two layers of films of a stent graft according to example 2 of the present invention;

FIG. 7 is a view showing the stent graft of the embodiment 1 and 2 of the present invention in an initial state installed in the carotid artery;

fig. 8 is a state diagram of the stent graft according to embodiments 1 and 2 of the present invention when it is impacted by blood flow at the external carotid artery.

The component names and designations in the drawings are as follows:

carotid artery 10, common carotid artery 11, internal carotid artery 12, external carotid artery 13, plaque 14, stent graft 20, stent body 21, membrane 22, opening 221, overlap region 222, port 223, proximal end 23, middle portion 24, distal end 25.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example 1

Fig. 1 is a block diagram of a carotid artery 10 according to an embodiment of the invention. As shown in fig. 1, the carotid artery 10 is divided into a common carotid artery 11, an internal carotid artery 12, and an external carotid artery 13, and the common carotid artery 11, the internal carotid artery 12, and the external carotid artery 13 form a Y-shaped bifurcation structure. The blood of the common carotid artery 11 flows into the internal carotid artery 12 and the external carotid artery 13, respectively, at the Y-shaped bifurcation. Wherein blood from the internal carotid artery 12 mainly flows to the brain and blood from the external carotid artery 13 mainly supplies facial organs. The common carotid artery 11 and the internal carotid artery 12 have plaques 14, and the plaques 14 cause narrowing of the blood vessel and affect the blood circulation. Therefore, a covered stent needs to be installed at a diseased part to enlarge a blood vessel and ensure that blood flows normally. However, when the stent graft of the prior art is attached to the carotid artery 10, the plaque 14 is easily broken, and the fragments form a thrombus, which flows downstream of the blood vessel, causing stroke and even death.

The utility model discloses a tectorial membrane support 20 is installed in common carotid 11 and internal carotid artery 12 of Y type bifurcation structure department to guarantee the normal circulation of blood, and can prevent that the thrombus from flowing to vascular low reaches.

Fig. 2 is a structural diagram of a stent graft 20 according to an embodiment of the present invention. As shown in FIG. 2, the present embodiment discloses a stent graft 20, the stent graft 20 including a stent body 21 and a thin membrane 22, the stent body 21 having a proximal end 23, a middle portion 24 and a distal end 25, the proximal end 23 being disposed upstream of the blood vessel relative to the distal end 25. The film 22 is mounted on and covers the stent body 21, and a plurality of openings 221 are opened on the surface of the film 22, and the openings 221 face the proximal end 23 or the distal end 25 of the stent body 21. The membrane 22 itself has a mesh, and the openings 221 are additionally machined in the membrane 22. The mesh is used for allowing blood to pass and blocking thrombus. The opening 221 is intended to allow blood to pass through the membrane 22 and still normally enter the external carotid artery 13.

After the stent body 21 of the stent graft 20 of the present embodiment is attached to the Y-shaped bifurcation of the carotid artery 10, the stent body 21 is expanded, the thin film 22 covers the plaque 14 in the blood vessel as the stent body 21 is expanded, and the plaque 14 can be prevented from being broken and falling off by the pressing of the stent body 21. Specifically, the film 22 presses the plaque 14 against the inner wall of the blood vessel, and even if the plaque 14 is detached from the inner wall of the blood vessel, the plaque will not fall off due to the presence of the film 22 and will not flow downstream of the blood vessel.

In addition, FIG. 7 is a view of the stent graft 20 of the present invention in an initial state when it is installed in the carotid artery 10. FIG. 8 is a view showing the stent graft 20 according to the embodiment of the present invention in a state where it is impacted by blood flow in the external carotid artery 13. As shown in fig. 7 and 8, after the stent body 21 is mounted to the common carotid artery 11 and the internal carotid artery 12, the blood flow entering the external carotid artery 13 from the common carotid artery 11 easily breaks the membrane 22 at the entrance of the external carotid artery 13, thereby ensuring that the blood normally enters the external carotid artery 13. The term "blow-off" here means: under the impact of blood flow into the external carotid artery 13, the openings 221 in the membrane 22 where it is impacted open.

In summary, the stent graft 20 of the present embodiment is safer to use than the prior art.

The stent graft 20 of the present embodiment is conveniently mounted to the carotid artery 10 without the need to find the entrance to the external carotid artery 13. The stent body 21 of this embodiment can be entirely covered with the thin film 22 without avoiding the entrance to the external carotid artery 13.

The film 22 of this embodiment may be woven from polymer filaments, or may be formed by laser drilling from polymer film material, and the mesh may be circular, square, diamond, oval, etc.

Preferably, the thin film 22 is formed by laser cutting the film to form the opening 221 in a simple manner.

Preferably, a plurality of sets of openings 221 are sequentially arranged in the length direction of the film 22, each set of openings 221 has a plurality of openings 221, and the plurality of openings 221 of each set of openings 221 are continuously distributed along the circumferential direction of the film 22. The opening 221 of the present embodiment may cover the entire surface of the holder body 21, or may cover a part of the surface of the holder body 21. After the stent body 21 is completely opened, the film 22 is also completely opened, and the two adjacent openings 221 are not overlapped.

The shape, size, and location distribution of the openings 221 may be designed according to the diameter of each blood vessel at the Y-shaped bifurcation to better accommodate different blood vessels.

Three shapes of the opening 221 are preferred in this embodiment.

FIG. 3 is a schematic diagram of a first monolayer film 22 of a stent graft 20 according to an embodiment of the present invention. The opening 221 has a semicircular structure. The plurality of sets of openings 221 form a fish scale-like distribution structure.

FIG. 4 is a diagram of a second monolayer film 22 of a stent graft 20 according to an embodiment of the invention. The opening 221 has a rectangular structure.

FIG. 5 is a schematic diagram of a third monolayer film 22 of a stent graft 20 according to an embodiment of the invention. The opening 221 has a triangular structure.

Preferably, the stent body 21 is a cylindrical or conical structure formed by laser cutting or weaving medical metal tubes. The medical metal material comprises medical stainless steel, nickel-titanium alloy, cobalt-based alloy, titanium alloy, magnesium alloy and the like, and the nickel-titanium alloy is preferred. After the stent body 21 is released in the blood vessel of the human body, the stent body 21 is expanded, and the tension of the stent body 21 is gradually increased along with the increase of the temperature until the stent body is completely expanded. After the stent body 21 is completely expanded, the blood vessel which is narrowed due to the lesion is expanded by the stent body 21, so that blood can normally pass through the blood vessel.

The thin film 22 is completely opened along with the complete opening of the stent body 21, and the thin film 22 can normally pass blood. The film 22 may be woven from medical polymer filaments or laser-cut from medical polymer films, which include medical chitin, medical fibrin, medical polyglycolic acid, medical polylactic acid, ePTFE, PET, PU, PEEK, PE, etc.

The film 22 may be attached to the surface of the stent body 21 by means of glue bonding, ultrasonic welding, laser welding, needle and thread sewing, hot pressing, or the like.

As shown in fig. 7 and 8, after the stent body 21 is mounted to the common carotid artery 11 and the internal carotid artery 12, the openings 221 will form through openings 223 under the impact of blood entering the external carotid artery 13, thereby ensuring that blood normally enters the external carotid artery 13.

Example 2

This embodiment is substantially the same as embodiment 1 except that: the film 22 of example 1 is a single-layer structure, and the film 22 of this example is a double-layer structure.

FIG. 6 is a schematic diagram of the two-layered film 22 of a stent graft 20 according to an embodiment of the present invention. As shown in fig. 6, it is preferable that the two films 22 have an overlapping area 222 between the openings 221. Specifically, each opening 221 of each layer of film 22 is a semi-circular structure, and the plurality of groups of openings 221 collectively form a fish-scale-like structure.

Preferably, the closed end of the opening 221 of the film 22 of the outer layer is laminated to the open end of the opening 221 of the film 22 of the inner layer. The open end of the opening 221 refers to the open end of the figure enclosed by the outline of the opening 221, and the closed end of the opening 221 refers to the closed end of the figure enclosed by the outline of the opening 221.

The film 22 of the present example can further prevent the plaque 14 from falling off and flowing into the downstream blood vessel, compared to example 1. In addition, the membrane 22 of this embodiment still forms the port 223 under the impact of the blood flow entering the external carotid artery 13 to allow the blood to normally enter the external carotid artery 13 for supplying blood to the facial organs. The stent graft 20 of the present embodiment is safer to use than prior art stent grafts.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A stent graft, comprising:

a stent body (21), the stent body (21) having a proximal end (23) and a distal end (25), the proximal end (23) being for placement upstream of a blood vessel relative to the distal end (25);

the thin film (22) is installed on and covers the bracket body (21), a plurality of openings (221) are formed in the surface of the thin film (22), and the openings (221) face the near end (23) or the far end (25) of the bracket body (21).

2. The stent graft as claimed in claim 1, wherein the thin film (22) is formed into the opening (221) by a laser cutting method.

3. The stent covered with a membrane according to claim 1, wherein a plurality of groups of openings (221) are sequentially arranged in the length direction of the membrane (22), each group of openings (221) has a plurality of openings (221), and the plurality of openings (221) of each group of openings (221) are continuously distributed along the circumferential direction of the membrane (22).

4. The stent graft as in claim 1, wherein the opening (221) is a semi-circular structure.

5. The stent graft as in claim 1, wherein the opening (221) is a rectangular-shaped structure.

6. The stent graft of claim 1, wherein the opening (221) is a triangular structure.

7. The stent graft as recited in claim 1, wherein the membrane (22) is a single layer structure.

8. The stent graft of claim 1, wherein the membrane (22) is a two-layer structure with an overlap region (222) between the openings (221) of the two layers of membrane (22).

9. The stent graft of claim 1, wherein the membrane (22) is a two-layer structure, with the closed end of the opening (221) of the membrane (22) of the outer layer being laminated to the open end of the opening (221) of the membrane (22) of the inner layer.

10. The stent graft as claimed in claim 1, wherein the stent body (21) is a cylindrical or conical cylindrical structure formed by medical metal tube laser cutting or medical metal wire weaving.