CN209734232U - Covered stent - Google Patents

Abstract

The present disclosure relates to a stent graft including a main body portion and a fenestration and/or bifurcation portion formed on the main body portion, the main body portion having a main graft body and a plurality of stent rings arranged on the main graft body at intervals in an axial direction, the plurality of stent rings including a first stent ring adjacent to the fenestration and/or bifurcation portion, the first stent ring including a first section and a second section connected to form an annular shape, the second section being bent to one side in the axial direction with respect to the first section so as to avoid the fenestration and/or bifurcation portion. The stent graft provided by the disclosure has a first stent ring which can be bent to one side along the axial direction to avoid the fenestration and/or the branch part and prevent the fenestration and/or the branch part from being extruded and deformed, thereby ensuring that the stent graft has enough supporting force.

Description

Covered stent

Technical Field

The present disclosure relates to medical devices, and in particular, to a stent graft.

Background

For the covered stent applied to a special part, windowing or branching is often needed.

Current patent CN205849590U discloses an aorta fenestration branch covered stent, contains the tubular skeleton of making by the filament, and covers tectorial membrane on the tubular skeleton, the proximal end of tubular skeleton is fit for inserting in aorta fenestration covered stent's window, with aorta fenestration covered stent intercommunication, the distal end of tubular skeleton is fit for inserting in the branch blood vessel, just the tubular skeleton the proximal end is harder than the distal end. The aorta windowing branch covered stent belongs to the technical field of vascular stents, reduces the operation difficulty of the aorta intracavity minimally invasive surgery keeping the branch blood flow, and solves the technical problem of internal leakage easily generated in the surgery.

Prior patent CN205626188U discloses a fenestration covered stent, which comprises two stent units, wherein each stent unit comprises a metal stent, a covering membrane coated on the surface of the metal stent and a metal bare stent connected with the top end of the metal stent, a fenestration area is arranged at the proximal end of the stent unit, and at least one membrane is arranged on the periphery of the covering membrane below the fenestration area. The two position-adjustable covered stent units are adopted, the operation is simple, the release is easy, the direct puncture can be completed, the wound is small, the displacement is not easy, the success rate of the operation is very high, the pain of a patient is reduced, the effect is reliable, and the renal artery can be better protected; the windowing covered stent has good adherence to blood vessels, effectively avoids gaps or gaps between the stent and the blood vessels at partial positions, and reduces the incidence rate of internal leakage.

For the covered stent which needs to be windowed or has branches, the common wavy stent is difficult to find enough space for windowing, so that the supporting force of the covered stent to the windowing or the branches is insufficient.

SUMMERY OF THE UTILITY MODEL

The covered stent provided by the disclosure has the advantages that the first stent ring with the bending part is arranged, the supporting force of the covered stent is improved, and the windowing part or the branch part is prevented from being extruded and deformed.

In order to achieve the above object, the present disclosure provides a stent graft including a main body part having a stent graft body and a plurality of stent rings arranged on the stent graft body at intervals in an axial direction, and fenestrations and/or branches formed on the main body part, the plurality of stent rings including a first stent ring adjacent to the fenestrations and/or branches, the first stent ring including a first section and a second section connected to form a ring shape, the second section being bent to one side in the axial direction with respect to the first section to avoid the fenestrations and/or branches.

Optionally, the second segment is formed into an arc shape or a zigzag shape along the axial direction.

Optionally, the first section is wavy.

Optionally, both ends of the second section are connected with the wave crests of the first section, or

And the two ends of the second section are connected with the wave troughs of the first section.

Optionally, the length of the first segment is 50-80% of the total length of the first stent ring.

Optionally, the first stent ring comprises one or more second segments.

Optionally, the plurality of stent rings further include a second stent ring, which is a wavy ring and is axially spaced apart from the fenestration and/or the branch portion by the first stent ring.

Optionally, the distance between the first stent ring and the fenestration or the branch portion is 5-20% of the length of the first stent ring.

Optionally, the membrane body is sewn or bonded to the first stent ring and the second stent ring.

Optionally, the stent graft is an aortic stent graft.

The stent graft provided by the disclosure has a first stent ring which can be bent to one side along the axial direction to avoid the fenestration and/or the branch part and prevent the fenestration and/or the branch part from being extruded and deformed, thereby ensuring that the stent graft has enough supporting force.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

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

Fig. 1 is a schematic structural view of one embodiment of a first stent ring provided by the present disclosure.

FIG. 2 is a schematic structural view of one embodiment of a stent graft provided by the present disclosure.

FIG. 3 is a schematic structural view of another embodiment of a stent graft provided by the present disclosure.

Description of the reference numerals

100-window 200-branch part

1 first section 12 second section of first carrier ring 11

2 main body of film coating

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

As shown in fig. 1 to 3, the present disclosure provides a stent graft including a main body portion having a stent graft body 2 and a plurality of stent rings arranged on the stent graft body 2 at intervals in an axial direction, the plurality of stent rings including a first stent ring 1 adjacent to the fenestration 100 and/or the bifurcation 200 (i.e., in the axial direction, no other stent ring exists between the first stent ring and the fenestration 100 and/or the bifurcation 200), the first stent ring 1 including a first segment 11 and a second segment 12 connected to form a ring shape, and a fenestration 100 and/or a bifurcation 200 formed on the main body portion, the second segment 12 being bent to one side in the axial direction with respect to the first segment 11 to avoid the fenestration 100 and/or the bifurcation 200.

The present disclosure provides a method of manufacturing a stent graft as follows: firstly, the size of the second section of the first support ring is designed according to the size of the windowing and/or the branch part, so that the windowing or the support ring can be partially accommodated in the bent part of the second section of the first support ring, then the plurality of support rings are connected with the film coating main body, and the windowing and/or the branch part is arranged on the film coating main body close to the first support ring, so that the first support ring at the windowing and/or the branch part can be effectively prevented from being extruded and deformed, and the supporting performance of the first support is ensured.

According to the present disclosure, the second segment may be provided in various shapes corresponding to the outer peripheral profile of the fenestration or the branch, for example, as shown in fig. 1 and 3, the second segment 12 may be formed in a C shape in the axial direction, for example, in an arc shape or a zigzag shape, so that the fenestration or the branch may be avoided in the bent portion of the second segment, and thus, the second segment may be prevented from being crushed.

The present disclosure is not particularly limited to the configuration of the first section, and the first section 11 may have a wave shape as shown in fig. 1-2. Further, both ends of the second segment 12 may be connected to the peaks of the first segment 11, or both ends of the second segment 12 may be connected to the valleys of the first segment 11, so that the space between the stent rings can be maximally utilized.

In the present disclosure, the lengths of the first section and the second section can be set as required, generally, the diameter of the fenestration or the branch part is slightly smaller than the diameter of the main body part, for example, the length of the first section 11 accounts for 50-80% of the total length of the first stent ring 1, and in the case that the first section is wavy, the length of the second section can be the length between at least two wave crests of the first section, so that the second section has the necessity of setting.

In the present disclosure, the stent graft may be provided with one or more fenestrations 100 and/or bifurcation portions 200 on the outer periphery of the same axial position, and therefore, the first stent ring 1 may include one or more second segments 12, the shape of which may be adapted to the outer peripheral shape of the fenestrations 100 and/or bifurcation portions 200, and the second segments may be adjacent to each other or may be separated by the first segments.

In the present disclosure, the plurality of stent rings may include a second stent ring, which may be a conventional stent ring, in addition to the first stent ring, but is a wavy ring and is axially spaced apart from the fenestration and/or bifurcation by the first stent ring 1 to avoid crush deformation of the fenestration and/or bifurcation on the second stent ring.

In the present disclosure, as shown in fig. 1 to 2, the distance between the first stent ring and the fenestration 100 or the bifurcation 200 may be 5 to 20% of the length of the first stent ring, so that the fenestration distance or the bifurcation 200 is prevented from being too close to the first stent ring to press and deform the first stent ring, and the strength of the fenestration and the bifurcation is improved.

In the present disclosure, the stent graft body and the stent graft may be connected in a conventional manner, for example, the stent graft body 2 may be sutured or bonded to the first stent graft 1 and the second stent graft, a thread may be threaded back and forth between the stent graft and the stent graft body during suturing, and an adhesive may be bonded between the stent graft and the stent graft. Other conventional means of attachment such as welding may also be used by those skilled in the art.

The stent graft provided by the present disclosure can be applied to various blood vessels, and preferably, the stent graft is an aortic stent graft.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A stent graft comprising a main body part having a main graft body (2) and a plurality of stent rings arranged on the main graft body (2) at intervals in an axial direction, and fenestrations (100) and/or branches (200) formed on the main body part, characterized in that the plurality of stent rings comprises a first stent ring (1) adjacent to the fenestrations (100) and/or branches (200), the first stent ring (1) comprising a first section (11) and a second section (12) connected to form a ring shape, the second section (12) being bent to one side in the axial direction with respect to the first section (11) to avoid the fenestrations (100) and/or branches (200).

2. The stent graft as set forth in claim 1, wherein the second segment (12) is formed in an arc shape or a zigzag shape in the axial direction.

3. The stent graft as claimed in claim 1, wherein the first section (11) is undulated.

4. The stent graft as claimed in claim 3, wherein both ends of the second segment (12) are connected to the peaks of the first segment (11), or

Both ends of the second section (12) are connected with the wave troughs of the first section (11).

5. The stent graft as claimed in claim 1, wherein the length of the first segment (11) is 50-80% of the total length of the first stent ring (1).

6. The stent graft of claim 1, wherein the first stent loop is located at a distance of 5-20% of the length of the first stent loop from the fenestration (100) or the bifurcation (200).

7. The stent graft as claimed in claim 1, wherein the first stent ring (1) comprises one or more second segments (12).

8. The stent graft as claimed in claim 1, wherein the plurality of stent rings further comprises a second stent ring which is a wavy ring and is axially spaced from the fenestration and/or bifurcation by the first stent ring (1).

9. The stent graft of claim 8, wherein the graft body (2) is sutured or bonded to the first stent ring (1) and the second stent ring.

10. The stent graft of claim 1, wherein the stent graft is an aortic stent graft.