Covered stent

Abstract

The utility model relates to the technical field of medical instruments, in particular to a covered stent. The covered stent comprises a supporting structure which is tubular and has a straight pipe state and a bent pipe state, the supporting structure comprises a plurality of supporting rings which are arranged at intervals, and a channel with openings in the two ends is formed in the supporting structure in the extending direction of the supporting structure; the outer side of the supporting structure is wrapped with the covering film, and the covering film is fixedly connected with the multiple supporting rings; the two sets of supporting wires are arranged at the two ends of the supporting structure respectively, each set comprises at least four supporting wires, one ends of the supporting wires are fixedly connected with the supporting ring at the opening, and the other ends of the supporting wires extend in the direction away from the supporting structure. According to the covered stent provided by the utility model, the supporting structure supports the inner wall of the blood vessel by wrapping the covering film on the peripheral surface of the supporting structure, and the at least four supporting wires are respectively arranged at the two ends of the supporting structure, so that the external expansion force of the two ends of the stent to the inner wall of the blood vessel is reduced, and the restenosis phenomenon is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a coated stent. Background Art

[0002] The mainstream treatment for peripheral vascular disease is stent implantation. For long-segment occlusive lesions, covered stents are more effective than bare metal stents. However, the areas where the two ends of the covered stent are connected to the native artery are subject to greater external expansion forces, which can cause hyperplasia of the smooth muscle system in the intima of the native artery, leading to greater restenosis at both ends of the covered stent. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the defect in the prior art that the two ends of the coated stent exert a large outward expansion force on the inner wall of the blood vessel, resulting in a large restenosis phenomenon at both ends of the coated stent, thereby providing a coated stent that can reduce the outward expansion force at both ends of the coated stent on the inner wall of the blood vessel, thereby reducing the restenosis phenomenon at both ends of the coated stent.

[0004] In order to solve the above technical problems, the utility model provides a stent graft, comprising:

[0005] The support structure is arranged in a tubular shape and has a straight tube state and a bent tube state. The support structure includes a plurality of support rings arranged at intervals. Along the extension direction of the support structure, a channel with two ends open is formed inside the support structure;

[0006] A covering film, wrapped around the outside of the supporting structure and fixedly connected to the plurality of supporting rings, wherein the outer peripheral surface of the covering film facing away from the supporting structure is suitable for abutting against the inner wall of the blood vessel;

[0007] Two groups of support wires are respectively arranged at both ends of the support structure, and each group includes at least four support wires. One end of the support wire is fixedly connected to the support ring at the opening, and the other end extends in a direction away from the support structure. The support wire is suitable for supporting the inner wall of the blood vessel.

[0008] Optionally, two ends of the covering film respectively extend toward the supporting wire to form an extension portion, and the extension portion is fixedly connected to the supporting wire and is suitable for covering a partial area of ​​the supporting wire.

[0009] Optionally, the axis of the support wire is parallel to the center line of the channel.

[0010] Optionally, the support ring is arranged in an S shape around the center line of the channel, and the support ring is suitable for supporting the coating.

[0011] Optionally, the diameters of the plurality of support rings are the same, so as to keep the inner diameter of the channel unchanged.

[0012] Optionally, along the extension direction of the channel, the diameters of the plurality of support rings gradually increase or decrease, so as to make the channel tapered.

[0013] Optionally, the diameter of the support ring ranges from 4 mm to 6 mm.

[0014] Optionally, along the extension direction of the channel, the support ring has crests and troughs, and the crest positions of two adjacent support rings correspond to the trough positions.

[0015] Optionally, when the stent graft is in the straight tube state, the support rings are equidistantly distributed along the extension direction of the channel.

[0016] Optionally, the material of the coating is elastic.

[0017] The technical solution of the utility model has the following advantages:

[0018] 1. The covered stent provided by the utility model has a support structure that supports the inner wall of the blood vessel by wrapping the covered film on its outer peripheral surface, and at least four support wires are respectively arranged at both ends of the support structure to reduce the outward expansion force of the two ends of the stent on the inner wall of the blood vessel, thereby alleviating restenosis.

[0019] 2. The stent graft provided by the present invention is provided with an S-shaped support ring to increase the support area of ​​the support structure for the membrane graft, thereby improving the stability of the support structure in supporting the membrane graft 2.

[0020] 3. The coated stent provided by the utility model reduces the tension at the turning point of the support structure by arranging the wave crests of two adjacent support rings to correspond to the wave troughs.

[0021] 4. The stent graft provided by the present invention has a plurality of support rings equidistantly distributed to enhance the support reliability of the support structure for the graft.

[0022] 5. The coated stent provided by the present invention has an elastic coating, which can reduce the tension at the turning point of the coated stent and can adjust the length of the coated stent to a certain extent, thereby improving applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a three-dimensional schematic diagram of the stent graft of the utility model;

[0025] Figure 2 It is a schematic diagram of the utility model of the stent graft in the expanded state;

[0026] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0027] Figure 4 It is a side view of one end of the coated stent of the utility model.

[0028] Description of reference numerals:

[0029] 1-support ring, 2-film, 3-support wire, 4-extension part, 5-platinum marking point. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Embodiment 1

[0035] Combination Figure 1-Figure 4 As shown, the stent graft provided in this embodiment includes:

[0036] The support structure is arranged in a tubular shape and has a straight tube state and a bent tube state. The support structure comprises a plurality of support rings 1 arranged at intervals. Along the extension direction of the support structure, a channel with openings at both ends is formed inside the support structure;

[0037] A coating 2 wrapped around the outside of the support structure and fixedly connected to the plurality of support rings 1, wherein the outer peripheral surface of the coating 2 facing away from the support structure is suitable for abutting against the inner wall of the blood vessel;

[0038] Two groups of support wires 3 are respectively arranged at both ends of the support structure, and each group includes at least four support wires 3. One end of the support wire 3 is fixedly connected to the support ring 1 at the opening, and the other end extends in a direction away from the support structure. The support wire 3 is suitable for supporting the inner wall of the blood vessel.

[0039] The coated stent is implanted into the blood vessel to support the inner wall of the blood vessel, so that the interior of the blood vessel implanted with the coated stent remains unobstructed. The shape of the support structure is adapted to the shape of the blood vessel so as to be arranged inside the blood vessel, wherein the support structure can be in a straight tube state or a curved tube state, or a part of the area can be in a straight tube state and the rest can be in a curved tube state, and the shape of the support structure is adapted to be adjusted to follow the shape of the blood vessel. The plurality of support rings 1 are adapted to form the channel with openings at both ends, and when the support structure supports the blood vessel, the blood inside the blood vessel is adapted to flow into the channel through an opening at one end of the channel and flow out through an opening at the other end of the channel, so that the blood can flow smoothly inside the blood vessel.

[0040] The coating 2 is wrapped around the outer circumference of the support structure and fixedly connected to the plurality of support rings 1. The plurality of support rings 1 are indirectly connected through the coating 2, and the support rings 1 abut against the inner wall of the blood vessel via the coating 2. By wrapping at least one layer of the coating 2 around the outer circumference of the support structure, the proliferation of the smooth muscle system in the endothelium of the blood vessel is prevented, thereby affecting the patency rate inside the support structure.

[0041] Combination Figure 1 and Figure 3 As shown, at least four support wires 3 are provided at each end of the support structure, one end of the support wire 3 is fixedly connected to the support ring 1 located at both ends of the support structure, and the other end extends in a direction away from the support structure. Preferably, four support wires 3 are provided at each end of the support structure, and the four support wires 3 at each end are equidistantly distributed around the axis of the channel, and the support wires 3 are abutted against the inner wall of the blood vessel to improve the stability of the two ends of the support structure. Figure 2 , Figure 3 and Figure 4 As shown, at least one of the support wires 3 at both ends of the support structure is provided with a platinum marking point 5, and medical personnel are suitable for locating the proximal end and the distal end of the coated stent through the platinum marking point 5. The coated stent is a self-expanding stent, which allows the coated stent to enter the body from outside the body along the guide wire, and is guided to the lesion according to the platinum marking point 5. After accurate positioning, the outer sheath is removed to release the coated stent. Preferably, each end has two support wires 3 provided with the platinum marking point 5, and the support wires 3 with the platinum marking point 5 are arranged at intervals, and the platinum marking point 5 is arranged at the end of the support wire 3 away from the support structure. Along the extension direction of the channel, the length of the coated stent is the sum of the length of the supporting structure and the length of the supporting wire 3. The length range of the coated stent is 30mm-160mm to be suitable for the blood vessels in different parts. Preferably, the length of the coated stent can be 30mm, 60mm, 80mm, 100mm, 120mm, 140mm, 160mm, wherein the length of the supporting wire 3 is 20mm.

[0042] The coated stent provided in this embodiment has a support structure that supports the inner wall of the blood vessel by wrapping the coating 2 on its outer circumferential surface, and provides at least four support wires 3 at both ends of the support structure to reduce the outward expansion force of the two ends of the stent on the inner wall of the blood vessel, thereby alleviating restenosis.

[0043] Specifically, two ends of the coating 2 extend toward the supporting wire 3 to form an extension portion 4 . The extension portion 4 is fixedly connected to the supporting wire and is suitable for covering a partial area of ​​the supporting wire 3 .

[0044] Preferably, along the extension direction of the support wire 3, the coating 2 extends toward the support wire 3 to form the extension portion 4, the length of the extension portion 4 is 10 mm, the extension portion 4 is wrapped around the side of the plurality of support wires 3 at the same end close to the inner wall of the blood vessel, the partial area of ​​the support wire 3 is suitable for abutting the inner wall of the blood vessel via the extension portion 4, and the other areas of the support wire 3 except the partial area directly abut the inner wall of the blood vessel. The extension portion 4 partially covers the support wire 3, the outward expansion force of the coating 2 is greater than the outward expansion force of the extension portion 4, and the area of ​​the support wire 3 not covered by the extension portion 4 has no outward expansion force, so as to facilitate the transition of the outward expansion force along the extension direction of the coating 2 toward the support wire 3. It should be noted that the support wires 3 at both ends of the support structure are anchored at the position where the blood vessel has no lesions, and the plaque or calcification in the blood vessel in this area is relatively light, and will not be compressed to cause the collapse of the end of the extension portion 4 away from the coating 2.

[0045] Specifically, the axis of the support wire 3 is parallel to the center line of the channel.

[0046] Preferably, the extension direction of the support wire 3 is parallel to the center line of the channel at the opening.

[0047] Specifically, the support ring 1 is arranged in an S shape around the center line of the channel, and the support ring 1 is suitable for supporting the coating 2.

[0048] Combination Figure 1 and Figure 2 As shown, preferably, the support ring 1 is S-shaped or corrugated and arranged around the center of the channel.

[0049] The stent graft provided in this embodiment has the support ring 1 arranged in an S shape to increase the support area of ​​the support structure for the membrane 2, thereby improving the stability of the support structure in supporting the membrane 2.

[0050] Specifically, the diameters of the plurality of support rings 1 are the same, so as to keep the inner diameter of the channel unchanged.

[0051] Along the extension direction of the channel, the diameter of the support structure includes multiple types to be suitable for the blood vessels in different parts. When the diameters of the multiple support rings 1 on the same support structure are the same, the diameter of the support ring 1 ranges from 4mm to 10mm. Preferably, the diameter of the support ring 1 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0052] Specifically, along the extending direction of the channel, the diameters of the plurality of support rings 1 gradually increase or decrease, so as to make the channel tapered.

[0053] Specifically, the diameter of the support ring 1 ranges from 4 mm to 6 mm.

[0054] When the channel is conical, the diameter of the support ring 1 at the smaller diameter end is in the range of 4 mm to 5 mm, and the diameter of the support ring 1 at the larger diameter end is in the range of 5 mm to 6 mm.

[0055] Additionally, the channel may also be funnel-shaped, and the diameter of the support ring 1 may be at least 4 mm and at most 6 mm.

[0056] Specifically, along the extension direction of the channel, the support ring 1 has crests and troughs, and the crest positions of two adjacent support rings correspond to the trough positions.

[0057] Preferably, along the extension direction of the channel, the connecting line of the wave crests and wave troughs of the plurality of support rings 1 is parallel to the center line of the channel. The peak values ​​of the wave crests and wave troughs of the plurality of support rings 1 may be consistent or inconsistent.

[0058] The stent graft provided in this embodiment reduces the tension at the turning point of the support structure by arranging the wave crests of two adjacent support rings 1 to correspond to the wave troughs.

[0059] Specifically, when the stent graft is in the straight tube state, the support rings 1 are equidistantly distributed along the extension direction of the channel.

[0060] The stent graft provided in this embodiment has a plurality of support rings 1 equidistantly distributed to enhance the support reliability of the support structure for the graft 2 .

[0061] Specifically, the material of the coating 2 is elastic.

[0062] The plurality of support rings 1 are indirectly connected through the coating 2. Since the coating 2 is elastic, the tension at the corner of the support structure can be reduced and the length of the stent can be adjusted to a certain extent. The inner wall of the coating 2 close to the through hole is provided with a heparin coating to reduce thrombus in the coated stent and avoid the risk of proliferation.

[0063] In the stent graft provided in this embodiment, the coating 2 is elastic, so that the tension at the bends of the stent graft can be reduced and the length of the stent graft can be adjusted to a certain extent, thereby improving the applicability.

[0064] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention of the utility model.

Claims

1. A stent graft, characterized in that: include: The support structure is arranged in a tubular shape and has a straight tube state and a bent tube state. The support structure comprises a plurality of support rings (1) arranged at intervals. Along the extension direction of the support structure, a channel with two ends open is formed inside the support structure. A coating (2) is wrapped around the outside of the support structure and fixedly connected to the plurality of support rings (1); the outer peripheral surface of the coating (2) facing away from the support structure is suitable for abutting against the inner wall of the blood vessel; Two groups of support wires (3) are respectively arranged at two ends of the support structure, each group comprises at least four support wires (3), one end of the support wire (3) is fixedly connected to the support ring (1) at the opening, and the other end extends in a direction away from the support structure, and the support wire (3) is suitable for supporting the inner wall of the blood vessel; The length of the stent graft ranges from 30 mm to 160 mm; The two ends of the coating (2) respectively extend toward the supporting wire (3) to form an extension portion (4); the extension portion (4) is fixedly connected to the supporting wire and is suitable for covering a partial area of ​​the supporting wire (3).

2. The stent graft according to claim 1, characterized in that: The axis of the support wire (3) is parallel to the center line of the channel.

3. The stent graft according to claim 1, characterized in that: The support ring (1) is arranged in an S shape around the center line of the channel, and the support ring (1) is suitable for supporting the coating (2).

4. The stent graft according to claim 3, characterized in that: The diameters of the plurality of support rings (1) are the same, so as to keep the inner diameter of the channel constant.

5. The stent graft according to claim 3, characterized in that: Along the extension direction of the channel, the diameters of the plurality of support rings (1) gradually increase or decrease, so as to make the channel tapered.

6. The stent graft according to claim 5, characterized in that: The diameter of the support ring (1) ranges from 4 mm to 6 mm.

7. The stent graft according to claim 3, characterized in that: Along the extension direction of the channel, the support ring (1) has wave crests and wave troughs, and the wave crest positions of two adjacent support rings correspond to the wave trough positions.

8. The stent graft according to claim 1, characterized in that: When the stent graft is in the straight tube state, the support rings (1) are distributed at equal distances along the extension direction of the channel.

9. The stent graft according to any one of claims 1 to 8, characterized in that: The material of the coating (2) is elastic.

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