CN211131532U - Covered stent and covering film thereof - Google Patents
Covered stent and covering film thereof Download PDFInfo
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- CN211131532U CN211131532U CN201921032407.7U CN201921032407U CN211131532U CN 211131532 U CN211131532 U CN 211131532U CN 201921032407 U CN201921032407 U CN 201921032407U CN 211131532 U CN211131532 U CN 211131532U
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- annular portion
- stent
- tectorial membrane
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- peripheral wall
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Abstract
The utility model relates to a tectorial membrane support and tectorial membrane thereof, this tectorial membrane includes the tectorial membrane body, the cover is equipped with the sealing member on the tip periphery wall of tectorial membrane body, the sealing member is constructed to can meet water inflation and form into clitellum structure, clitellum structure including be used for with the connection annular portion that the tectorial membrane body links to each other with for the free annular portion that the tectorial membrane body freely set up, free annular portion with connect annular portion and arrange along the axial. By the technical scheme, the connecting annular part of the sealing element of the outer peripheral wall of the film covering end part positions the sealing element at the end part of the film covering body, and when the sealing element is impacted by fluid such as blood, the free annular part expands outwards in the radial direction to enable the outer peripheral wall of the sealing element to be completely attached to the inner peripheral wall of the blood vessel so as to physically block a gap between the outer peripheral wall of the film covering and the inner peripheral wall of the blood vessel.
Description
Technical Field
The disclosure relates to the field of medical equipment, in particular to a covered stent and a covering film thereof.
Background
With the progress of medical technology, stent grafts are widely used in the treatment of vascular diseases such as peripheral vascular malformation and acute and chronic vascular injuries. The most common complication after the stent graft is the occurrence of internal leakage, which means that blood continuously flows into the false cavity in various ways after the stent graft is implanted, for example, the blood flows into the false cavity through a gap between the proximal end of the stent and the aorta, so that the high-speed blood flow at the proximal end of the stent changes the false cavity into a high-pressure cavity which can not be entered, and the probability of forming or breaking the false cavity or aneurysm is greatly increased. After the internal leakage occurs, the patient is often required to be treated for the second time, which increases the pain of the patient.
SUMMERY OF THE UTILITY MODEL
The purpose of the disclosure is to provide a covered stent and a covered membrane thereof, the sealing performance between the covered membrane and a blood vessel is strong, and internal leakage can be effectively prevented.
In order to achieve the above object, the present disclosure provides a stent graft including a stent graft body, a sealing member is sleeved on an end outer peripheral wall of the stent graft body, the sealing member is configured to be capable of swelling in water and is formed into a hoop structure, the hoop structure includes a connection annular portion for connecting with the stent graft body and a free annular portion freely disposed with respect to the stent graft body, and the free annular portion and the connection annular portion are axially arranged.
Optionally, the free annular portion comprises a first annular portion located between the connecting annular portion and the end edge of the graft body.
Optionally, the free annular portion further includes a second annular portion, and the annular belt structure is composed of the first annular portion, the connecting annular portion, and the second annular portion in this order along the axial direction.
Optionally, the axial lengths of the first and second annular portions are equal.
Optionally, the ratio of the axial lengths of the free annular part and the connecting annular part is (3-5): 1.
Optionally, the connection ring-shaped portion is fixed to the covering film body by sewing or bonding with a thread.
Optionally, the diameter of the free annular portion is greater than the diameter of the connecting annular portion.
Optionally, the surface of the sealing member is formed with a water-absorbing fluff structure.
The present disclosure also provides a stent graft, comprising a stent and a graft supported by the stent, wherein the graft is a graft according to the above.
Optionally, the stent includes a plurality of stent rings disposed at intervals in the axial direction, and the sealing member is disposed on the outer peripheral wall of the stent graft body corresponding to one of the stent rings.
Through the technical scheme, after the covering membrane is implanted into a blood vessel, the outer peripheral wall of the end part of the covering membrane is anchored with the inner peripheral wall of the blood vessel, and a sealing element is arranged between the outer peripheral wall of the end part of the covering membrane and the inner peripheral wall of the blood vessel to improve the fitting degree and the sealing property of the covering membrane body and the blood vessel so as to prevent internal leakage; the connecting annular part of the sealing element is used for being connected with the film covering body so as to position the sealing element at the end part of the film covering body, and the free annular part is freely arranged on the film covering body, so that when the sealing element is impacted by fluid such as blood, a tiny gap can be formed between the inner peripheral wall of the free annular part and the film covering body, the free annular part expands outwards along the radial direction, and the outer peripheral wall of the free annular part is completely attached to the inner peripheral wall of the blood vessel so as to physically block the gap between the outer peripheral wall of the film covering and the inner peripheral wall of the blood vessel; in addition, the seal may be made of a water-swellable material to better fill the gap and prevent internal leakage.
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 a stent graft and its cover in one embodiment of the present disclosure;
FIG. 2 is a schematic structural view of a stent graft and its cover in another embodiment of the present disclosure;
FIG. 3 is a schematic structural view of a stent graft and its cover in yet another embodiment of the present disclosure.
Description of the reference numerals
1 film-covered body 2 seal
21 connecting the free ring part of the ring part 22
221 a first annular portion 222 and a second annular portion
3 axial direction of stent A
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.
In the present disclosure, unless otherwise specified, use of directional terms such as "inner" and "outer" refers to the interior and exterior of the contours of the respective component or structure. Furthermore, terms such as "first," "second," and the like, are used herein to distinguish one element from another, and are not necessarily sequential or significant. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.
In the related art, the inventor of the present application finds that the failure of completely isolating the communication between the diseased part and the blood vessel after the covering membrane is implanted into the diseased part and positioned is the root cause of the occurrence of the internal leakage, that is, the outer peripheral wall of the covering membrane and the inner peripheral wall of the blood vessel are not attached to each other to form a gap, and the blood flows into the false cavity from the gap.
In view of this, as shown in fig. 1 to 3, an embodiment of the present disclosure provides a stent graft including a stent graft body 1, a seal 2 sleeved on an end outer peripheral wall of the stent graft body 1, the seal 2 configured to be capable of expanding with water and formed in a hoop structure including a connection annular portion 21 for connecting with the stent graft body 1 and a free annular portion 22 freely provided with respect to the stent graft body 1, the free annular portion 22 and the connection annular portion 21 being arranged in an axial direction a. The free annular portion 22 is freely provided with respect to the film body 1, which means that the free annular portion 22 covers only the outer peripheral wall of the film body 1 and has no fixed connection with the film body 1, that is, the film body 1 does not restrain the free annular portion 22.
Through the technical scheme, after the covering membrane is implanted into a blood vessel, the outer peripheral wall of the end part of the covering membrane is anchored with the inner peripheral wall of the blood vessel, and the sealing element 2 is arranged between the outer peripheral wall of the end part of the covering membrane and the inner peripheral wall of the blood vessel to improve the fitting degree and the sealing property of the covering membrane body 1 and the blood vessel so as to prevent internal leakage; the connecting annular part 21 of the sealing member 2 is used for being connected with the film body 1 so as to position the sealing member 2 at the end part of the film body 1, and the free annular part 22 is freely arranged on the film body 1, so that when the sealing member 2 is impacted by fluid such as blood, a tiny gap can be formed between the inner peripheral wall of the free annular part 22 and the film body 1, so that the free annular part 22 expands outwards along the radial direction, and the outer peripheral wall of the free annular part is completely attached to the inner peripheral wall of the blood vessel so as to physically block the gap between the outer peripheral wall of the film and the inner peripheral wall of the blood vessel; in addition, the sealing member 2 may be made of a water-swellable material to better fill the gap and prevent internal leakage.
For example, the surface of the sealing element 2 in the embodiment of the present disclosure may also be formed with a water-absorbing fluff structure, for example, the sealing element 2 may be made of any one of polyglycolide, polyvinyl alcohol compounds, celluloses (dacron, hemostatic cotton, etc.), and gelatin sponge. The absorbent fluff structure of the sealing member 2 can be spread when being impacted by blood flow, and a dense net structure is formed in the gap, so that the flow velocity of blood can be greatly reduced, and blood coagulation can be promoted.
As an exemplary embodiment of the present disclosure, as shown in fig. 1, the free annular portion 22 includes a first annular portion 221, the first annular portion 221 being located between the connecting annular portion 21 and the end edge of the stent body 1. When blood flows from the end edge of the stent body 1 to the first annular portion 221, the first annular portion 221 slightly expands outward in the radial direction to block the gap between the stent body 1 and the blood vessel and prevent the blood from flowing out through the gap.
Further, as another exemplary embodiment of the present disclosure, the free annular portion 22 includes, in addition to the first annular portion 221, as shown in fig. 2, the free annular portion 22 further includes a second annular portion 222, and the annular band structure is composed of the first annular portion 221, the connecting annular portion 21, and the second annular portion 222 in this order in the axial direction a. Thus, when a liquid such as tissue fluid outside the blood vessel hits the second annular portion 222, the second annular portion 222 also slightly expands radially outward, and the tissue fluid outside can be prevented from penetrating into the blood vessel. The annular band structure is formed in a structure in which only the middle portion is connected to the film covering body 1 and both sides are freely provided, and even when the radial dimension of the gap is larger than the thickness of the annular band structure after expansion, the annular band structure can close the gap by the first annular portion 221 and the second annular portion 222 which are slightly expanded outward, and the sealing performance is better.
In order to keep the first and second annular portions 221 and 222 uniformly expanded and expanded outward, the first and second annular portions 221 and 222 are equal in axial length. In other embodiments of the present disclosure, the axial lengths of the first annular portion 221 and the second annular portion 222 may be different, for example, the axial length of the first annular portion 221 may be greater than the axial length of the second annular portion 222, so as to mainly prevent blood from leaking into the blood vessel.
In a preferred embodiment of the present disclosure, the ratio of the axial lengths of the free annular portion 22 and the connecting annular portion 21 is (3-5): 1, wherein the axial length of the free annular portion 22 includes the sum of the axial lengths of the first annular portion 221 and the second annular portion 222. It can be seen that the axial length of the connecting annular portion 21 is much smaller than the axial length of the free annular portion 22, and this ratio can increase the axial length of the free annular portion 22 as much as possible while facilitating the fixation of the connecting annular portion 21.
Further, the connection ring portion 21 is fixed to the film main body 1 by sewing or bonding with a thread. When bonding is used, the axial length of the connecting ring portion 21 may be slightly longer, for example, the ratio of the axial lengths of the free ring portion 22 and the connecting ring portion 21 is 3:1, so as to ensure the bonding firmness (as shown in fig. 1 or fig. 2); when the thread sewing is used, the ratio of the axial lengths of the free annular portion 22 and the connecting annular portion 21 may be 5:1 to increase the flexibility of the free annular portion 22 to expand outward.
In addition, in other embodiments of the present disclosure, the ratio of the axial lengths of the free annular portion 22 and the connection annular portion 21 may be flexibly designed according to actual dimensions, and is not limited to the above range. For example, when the manner of sewing with a thread is adopted, the sealing member 2 may be sewn to the cover film body 1 by a sewing thread extending in the circumferential direction of the sealing member 2 (as shown in fig. 3), which is not limited by the present disclosure.
In order to ensure that the connecting annular portion 21 is attached to the stent body 1, the inner diameter of the connecting annular portion 21 may be equal to the inner diameter of the stent body 1, and in order to allow the free annular portion 22 to expand outward under the impact of blood, the diameter of the free annular portion 22 is larger than that of the connecting annular portion 21, so that a certain gap exists between the free annular portion 22 and the outer circumferential wall of the stent body 1, and the free annular portion 22 is easily expanded outward in the radial direction to be attached to the inner circumferential wall of the blood vessel when the blood impacts.
As shown in fig. 1 to 3, another embodiment of the present disclosure also provides a stent graft including a stent 3 and a cover supported by the stent 3, the cover being the cover in the above-described embodiment. The stent 3 may be sleeved on the outer side of the covering film or supported on the inner side of the covering film, which is not limited in this disclosure. The sealing element 2 of the film is always sleeved on the outer sides of the film body 1 and the bracket 3.
As an exemplary embodiment of the present disclosure, the stent 3 includes a plurality of stent rings disposed at intervals in the axial direction a, and the seal 2 is disposed on the outer peripheral wall of the stent body 1 corresponding to one stent ring. That is, the axial length of the sealing element 2 can be equal to the axial length of a stent ring, and the sealing element 2 is correspondingly sleeved outside the stent ring, and the stent ring supports the sealing element 2, so that the sealing element 2 is tightly attached between the outer peripheral wall of the stent body 1 and the inner peripheral wall of the blood vessel.
However, in other embodiments of the present disclosure, the axial length of the sealing element 2 may also cover a plurality of spaced stent rings, and those skilled in the art can flexibly design the sealing element according to the actual requirements of the patient, which is not limited by the present disclosure.
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. For example.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
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. The utility model provides a tectorial membrane of tectorial membrane support, includes tectorial membrane body (1), its characterized in that, the cover is equipped with sealing member (2) on the tip periphery wall of tectorial membrane body (1), sealing member (2) are constructed and can be met water inflation and form into the clitellum structure, the clitellum structure including be used for with connection ring type portion (21) that tectorial membrane body (1) links to each other and for free ring type portion (22) that tectorial membrane body (1) freely set up, free ring type portion (22) with connect ring type portion (21) and arrange along axial (A).
2. The membrane according to claim 1, wherein the free annular portion (22) comprises a first annular portion (221), the first annular portion (221) being located between the connecting annular portion (21) and an end edge of the membrane body (1).
3. The covering membrane according to claim 2, characterized in that said free annular portion (22) further comprises a second annular portion (222), said annular structure being composed of, in sequence in the axial direction (a), said first annular portion (221), said connecting annular portion (21) and said second annular portion (222).
4. The coating according to claim 3, characterized in that the axial length of said first annular portion (221) and of said second annular portion (222) is equal.
5. The coating according to any one of claims 1 to 4, wherein the ratio of the axial lengths of the free annular portion (22) and the connecting annular portion (21) is (3-5): 1.
6. The membrane according to any one of claims 1 to 4, characterized in that the connection ring (21) is fixed to the membrane body (1) by means of stitching or adhesive bonding.
7. The coating according to any one of claims 1 to 4, characterized in that the diameter of the free annular portion (22) is greater than the diameter of the connecting annular portion (21).
8. The coating according to claim 1, characterized in that the surface of the seal (2) is formed with a water-absorbing fleece structure.
9. A stent graft comprising a stent (3) and a graft supported by the stent (3), characterized in that the graft is according to any one of claims 1 to 8.
10. The stent graft of claim 9, wherein the stent (3) comprises a plurality of stent rings arranged at intervals in the axial direction (a), and the seal (2) is arranged on the outer circumferential wall of the stent graft body (1) corresponding to one stent ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921032407.7U CN211131532U (en) | 2019-07-03 | 2019-07-03 | Covered stent and covering film thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921032407.7U CN211131532U (en) | 2019-07-03 | 2019-07-03 | Covered stent and covering film thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211131532U true CN211131532U (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921032407.7U Active CN211131532U (en) | 2019-07-03 | 2019-07-03 | Covered stent and covering film thereof |
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| CN (1) | CN211131532U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112587279A (en) * | 2020-12-09 | 2021-04-02 | 山东第一医科大学附属省立医院(山东省立医院) | Assembled aorta large support system |
-
2019
- 2019-07-03 CN CN201921032407.7U patent/CN211131532U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112587279A (en) * | 2020-12-09 | 2021-04-02 | 山东第一医科大学附属省立医院(山东省立医院) | Assembled aorta large support system |
| CN112587279B (en) * | 2020-12-09 | 2022-07-29 | 山东第一医科大学附属省立医院(山东省立医院) | Assembled aorta large support system |
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