Lumen stent and lumen stent system

Abstract

The invention relates to a lumen stent and a lumen stent system.The lumen stent can be used in cooperation with a branch stent and comprises a stent body and a fence, the stent body is tubular and provided with a sealed tube wall, and the fence is connected with the stent body and comprises a plurality of blocking pieces arranged at intervals in the circumferential direction; each separation blade comprises an elastic frame and a sealing film arranged on the frame, the frame comprises two first edges spaced from each other in the circumferential direction and a second edge connected with the two first edges, the end, away from the second edge, of each first edge is connected with the support body, and the frame can deflect relative to the support body; a first gap is formed between the two adjacent first edges of the two adjacent blocking pieces, one end of the branch support can stretch into the first gap and is clamped by the two adjacent first edges of the two adjacent blocking pieces, and the branch support extrudes the two adjacent first edges so that the two adjacent first edges can be supported by the branch support in the radial direction. The lumen stent can reduce internal leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a lumen stent and a lumen stent system. Background Art

[0002] The information provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] Aneurysm and aortic dissection are common cardiovascular diseases. Endovascular exclusion is one of the common means for treating aneurysm and aortic dissection. For example, a covered stent is compressed and loaded into the delivery catheter of a delivery device, and then the delivery catheter with the covered stent is delivered along the patient's blood vessel. Then, the covered stent in the delivery catheter is released at the lesion site, so that the covered stent radially expands at the lesion site and covers the aneurysm or dissection, thereby isolating the aneurysm cavity or dissection from the inner lumen of the blood vessel and preventing blood from entering the aneurysm cavity or dissection.

[0004] When the lesion site involves a branched blood vessel, in order to avoid blocking the branched blood vessel by the covered stent, in addition to implanting a covered stent in the main blood vessel, a branched stent generally needs to be implanted. A part of the branched stent is located in the main blood vessel and arranged side by side with the covered stent, and the other part extends into the branched blood vessel, so that the blood in the main blood vessel can flow into the branched blood vessel along the branched stent. However, after the branched stent is implanted, there will be a large gap between the branched stent and the stent body, resulting in endoleakage, so that blood can continue to flow into the aneurysm cavity or dissection and the treatment effect cannot be achieved. Summary of the Invention

[0005] Based on this, it is necessary to provide a lumen stent that can reduce endoleakage.

[0006] Furthermore, a lumen stent system that can reduce endoleakage is provided.

[0007] A lumen stent, which can be used in cooperation with a branched stent, includes a stent body and a baffle. The stent body is tubular and has a sealed tube wall. The baffle is connected to the stent body. The baffle includes a plurality of baffles arranged at intervals in the circumferential direction. Each baffle includes an elastic frame and a sealing film arranged on the frame. The frame includes two first sides spaced from each other in the circumferential direction and a second side connecting the two first sides. One end of the first side away from the second side is connected to the stent body, and the frame is deflectable relative to the stent body. There is a first gap between two adjacent first sides of two adjacent baffles. One end of the branched stent can extend into the first gap and is clamped by the two adjacent first sides of the two adjacent baffles, and the branched stent presses the two adjacent first sides so that the two adjacent first sides are radially supported by the branched stent.

[0008] A lumen stent system includes a branch stent and the above-mentioned lumen stent. One end of the branch stent can extend into the first gap and is clamped by two adjacent first sides of the two adjacent retaining sheets, and the two adjacent first sides are radially supported by the branch stent.

[0009] When the above-mentioned lumen stent and the branch stent are used in combination, after the lumen stent and the branch stent are implanted, the lumen stent is located in the main blood vessel, one end of the branch stent is located in the branch blood vessel, and the other end extends into the main blood vessel. Moreover, the part of the branch stent located in the main blood vessel passes through the first gap between two adjacent retaining sheets of the enclosure, and after the branch stent is radially expanded, it is clamped by two adjacent first sides of the two adjacent retaining sheets. Correspondingly, the branch stent can exert an extrusion force on two adjacent first sides of the adjacent retaining sheets. At the same time, since the frame of the retaining sheet can deflect relative to the stent body, two adjacent first sides of the two adjacent retaining sheets are radially supported by the branch stent, so that the two adjacent retaining sheets are lifted radially to block the gap formed by the branch stent, the stent body and the main blood vessel. Therefore, using the above-mentioned lumen stent can reduce endoleakage.

[0010] After the above-mentioned lumen stent system is implanted into the body, the lumen stent is located in the main blood vessel, one end of the branch stent is located in the branch blood vessel, and the other end extends into the main blood vessel. Moreover, the part of the branch stent located in the main blood vessel passes through the first gap between two adjacent retaining sheets of the enclosure, thereby lifting the two adjacent retaining sheets adjacent to it, and the retaining sheets block the gap formed by the branch stent, the stent body and the main blood vessel, thereby reducing endoleakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0012] Wherein:

[0013] Figure 1 is a perspective view of a lumen stent in an embodiment;

[0014] Figure 2 is a structural schematic diagram of a branch stent in an embodiment;

[0015] Figure 3 is a perspective view of an enclosure in an embodiment;

[0016] Figure 4 is a cross-sectional view of a body stent and a retaining sheet in an embodiment;

[0017] Figure 5AIt is a state diagram of the lumen stent and the branch stent in the implanted state in an embodiment;

[0018] Figure 5B It is Figure 5A an enlarged view of G in;

[0019] Figure 6 It is a schematic structural diagram of the second side in an embodiment;

[0020] Figure 7 It is a cross-sectional view of the body stent and the connecting part in an embodiment;

[0021] Figure 8 It is a schematic structural diagram of the second side in an embodiment. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of 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 thus cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0025] In the field of interventional medical devices, generally, the end of a medical device implanted into the human body or an animal body that is closer to the operator is called the "proximal end", and the end that is farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of the medical device are defined based on this principle. The "axial direction" generally refers to the length direction of the medical device when it is being delivered, and the "radial direction" generally refers to the direction of the medical device that is not parallel to its "axial direction", and the "axial direction" and "radial direction" of any component of the medical device are defined based on this principle. The "circumferential direction" refers to the circumferential direction, that is, the direction around the axis of the lumen structure or the cylinder.

[0026] Please refer to Figure 1 , the present disclosure provides a lumen stent system, including a lumen stent 100 and a branch stent 300 (see Figure 2 ), the lumen stent 100 can cooperate with the branch stent 300 for treating aneurysms or dissections at the site with branched blood vessels.

[0027] Please refer to Figure 2 , in one embodiment, the branch stent 300 includes a branch membrane 31 and a branch bare stent 32. The branch membrane 31 is tubular, and the material of the branch membrane 31 has biocompatibility and sealing performance, so that the branch stent 300 can isolate blood. The material of the branch membrane 31 can be a polymer material such as polytetrafluoroethylene (PTFE), polyester (PET), etc.

[0028] Please refer to Figure 2 , the branch bare stent 32 is connected to the branch membrane 31, and the branch bare stent 32 includes a plurality of wave rings 321 connected axially. The material of the wave rings 321 is a shape memory material, such as a shape memory alloy metal such as nitinol, so that the branch stent 300 can be compressed to a smaller loading size under the action of a radial compression force for easy loading into a delivery catheter for delivery; after the radial compression force is removed, the branch stent 300 can radially self-expand and assume a radially expanded state, so that the branch stent 300 can be anchored in the blood vessel after being deployed in the blood vessel.

[0029] Please return to Figure 1 , in one embodiment, the lumen stent 100 includes a stent body 11 and a fence 12. The fence 12 is connected to the stent body 11, and the fence 12 is disposed at the end of the stent body 11.

[0030] The stent body 11 is tubular and includes a body membrane 111 and a bare stent 112. The body membrane 111 is tubular, and the material of the body membrane 111 has biocompatibility and sealing performance, enabling the stent body 11 to isolate blood, so the wall of the stent body 11 has sealing performance. The material of the body membrane 111 can be a polymer material such as polytetrafluoroethylene (PTFE), polyester (PET), etc.

[0031] Please refer toFigure 1 The bare stent 112 is connected to the body membrane 111. The bare stent 112 includes a plurality of wave loops 1121 connected axially. The material of the wave loops 1121 is a shape memory material, such as a shape memory alloy metal like nitinol alloy. The stent body 11 can be compressed to a smaller loading size under the action of a radial compression force for easy loading into a delivery catheter for transportation. After the radial compression force is removed, the stent body 11 can radially self-expand and assume a radially expanded state, so that the stent body 11 can be anchored in the blood vessel after being deployed in the blood vessel.

[0032] Please refer to Figure 1 and Figure 3 As shown in and, the enclosure 12 includes a plurality of baffles 121 arranged at intervals in the circumferential direction. A first gap S is formed between any two adjacent baffles 121. The first gap S is used to accommodate the branch stent 300. The maximum circumferential dimension of the gap S is smaller than the diameter of the branch stent 300, so that the branch stent 300 can contact the adjacent baffle 121 and apply an extrusion force to the adjacent baffle 121 after being released in the gap S. The edge of each baffle 121 includes two first sides 1211 spaced from each other in the circumferential direction and a second side 1212 for connecting the two first sides 1211. The adjacent two first sides 1211 of the adjacent two baffles 121 enclose the first gap S. One end of each first side 1211 in the axial direction is connected to the stent body 11, and the other end is connected to the second side 1212, so that there is an axial distance between the second side 1212 and the end of the first side 1211 connected to the stent body 11, and there is a radial distance between the second side 1212 and the stent body 11.

[0033] Each baffle 121 includes a sealing film 1213 and a frame 1214. The two first sides 1211 and a second side 1212 enclose the frame 1214. The first sides 1211 and the second side 1212 are elastic metal rods, such as nitinol alloy rods. The material of the sealing film 1213 can be a polymer material with sealing performance and biocompatibility, such as polytetrafluoroethylene (PTFE), polyester (PET), etc. The sealing film 1213 is arranged on the frame 1214 so that the area surrounded by each frame 1214 has sealing performance, so that each baffle 121 has sealing performance.

[0034] Please refer to Figure 1 and Figure 3, each frame 1214 is elastic, and the material of the frame 1214 can be a metal such as nitinol alloy, so that the edge of each flap 121 can undergo elastic deformation when subjected to an external force. In one embodiment, the frame 1214 of each flap 121 is deflectably connected to the corrugated ring 1121 of the bare stent 112 by a tying wire (not shown in the figure), so that the frame 1214 of each flap 121 is deflectably connected to the tube wall of the stent body 11. In other embodiments, the frame 1214 of each flap 121 is connected to the body film 111, so that the frame 1214 of each flap 121 is deflectably connected to the tube wall of the stent body 11.

[0035] Please refer to Figure 1 and Figure 3 , one end of the sealing film 1213 of each flap 121 is hermetically connected to the body film 111 along the axial direction, so that one end of each flap 121 along the axial direction is hermetically connected to the side wall of the stent body 11. Please also refer to Figure 4 , when the lumen stent 100 is in the unfolded state without being restricted by an external force, each flap 121 forms an acute angle A with the stent body 11, and each flap 121 can deflect relative to the stent body 11 under the action of a radial force. In the unfolded state, the enclosure 12 is generally a petal structure surrounding the end of the stent body 11.

[0036] Please refer to Figure 5A and Figure 5B , during implantation, first the lumen stent 100 is delivered to the main blood vessel 200, then the end of the stent body 11 provided with the enclosure 12 is first released outside the delivery catheter (not shown in the figure), and the end of the stent body 11 provided with the enclosure 12 is in a semi-released state (for example, semi-released and restricted by a tying wire). At this time, the diameter of the part of the stent body 11 located outside the delivery catheter is larger than the diameter when loaded in the delivery catheter, but smaller than the inner diameter of the blood vessel and not in contact with the wall; then, one end of the branch stent 300 is released in the main blood vessel 200 and extends into the first gap S between the first sides 1211 of two adjacent flaps 121. After the branch stent 300 is released in this gap S, it expands radially; further, the remaining part of the branch stent 300 is released. After release, one end of the branch stent 300 is located in the main blood vessel 200, and the other end extends into the branch blood vessel, so that the blood in the main blood vessel 200 can flow into the branch blood vessel through the branch stent 300. After the branch stent 300 is completely released, then the part of the stent body 11 located inside the delivery catheter is released from the delivery catheter, and finally the part of the stent body 11 in the semi-released state is released, so that the part of the stent body 11 connected to the enclosure 12 expands radially by itself.

[0037] Since the maximum circumferential dimension of the first gap S is smaller than the diameter of the branch stent 300 and the frame 1214 of the baffle 121 is elastic, after the branch stent 300 is radially expanded in the first gap S, the branch stent 300 abuts against the two adjacent first sides 1211 of the two adjacent baffles 121. Correspondingly, the branch stent 300 can exert a squeezing force on the two adjacent first sides 1211 of the two adjacent baffles 121. At the same time, since the frame 1214 of the baffle 121 can deflect relative to the stent body 11, the two adjacent first sides 1211 of the two adjacent baffles 121 are radially supported by the branch stent 300, so that the two adjacent baffles 121 are lifted radially to block the gap formed by the branch stent 300, the stent body 11 and the main blood vessel 200. And because the baffle 121 has sealing performance, blood can be reduced or avoided from flowing into the diseased part through the gap formed by the branch stent 300, the stent body 11 and the main blood vessel 200. Therefore, using the lumen stent 100 of this embodiment can reduce endoleakage.

[0038] In one embodiment, the maximum circumferential dimension of the first gap S does not exceed 0.9 times the diameter of the branch stent 300, so that the radially expanded branch stent 300 can be clamped more tightly by the two adjacent first sides 1211. And, under the support of the branch stent 300, the two adjacent baffles 121 are more easily lifted radially, so as to better seal the gap between the branch stent 300 and the lumen stent 100, which is beneficial to reducing endoleakage.

[0039] In addition, since the baffle 121 can deflect relative to the stent body 11 under the action of the radial force, the remaining baffles 121 in the enclosure 12 deflect relative to the stent body 11 under the combined action of the radial expansion force of the stent body 11 and the binding force of the inner wall of the main blood vessel 200 and fit with the outer wall of the stent body 11 and the inner wall of the main blood vessel 200, without causing a gap to be formed between the stent body 11 and the main blood vessel 200, so that blood will not flow into the diseased part.

[0040] In one embodiment, the baffles 121 in the enclosure 12 are arranged uniformly in the circumferential direction, so that the first gap S between any two adjacent baffles 121 can be passed through by the branch stent 300 and released in the first gap S. Therefore, the requirement for the circumferential position accuracy of the lumen stent 100 can be reduced, thereby improving the surgical efficiency.

[0041] Please refer to Figure 1 and Figure 6, in one embodiment, in each baffle 121, the second side 1212 extends along a first arc between two adjacent first sides 1211 connected thereto. A straight line connecting two ends of each second side 1212, which are connected to the two first sides 1211, may form a first line segment L1. The second side 1212 is symmetric about a straight line X1 that passes through the midpoint of the first line segment L1 and is perpendicular to the first line segment L1. The first line segment L1 is located between the first arc and the bracket body 11 in the radial direction. Moreover, the first arc is bent towards the direction of the first side 1211, such that the shape of the second side 1212 is closer to the shape of the inner wall of the main blood vessel 200. As a result, under the radial supporting forces of the bracket body 11 and the branch bracket 300, the second side 1212 can more easily fit against the inner wall of the main blood vessel 200, thereby reducing or avoiding endoleakage at the portion where the second side 1212 is in contact with the inner wall of the main blood vessel 200.

[0042] Please refer to Figure 3 and Figure 5A , in one embodiment, the circumferential spacing between two first sides 1211 of each baffle 121 first gradually decreases and then gradually increases from the portion where the first side 1211 is connected to the second side 1212 towards the connection portion between the first side 1211 and the bracket body 11, such that a first engaging portion is formed in a first gap S surrounded by two adjacent first sides 1211 of two adjacent baffles 121. When the branch bracket 300 is radially deployed in the first gap S, it is clamped by the first engaging portion, so that the outer wall of the branch bracket 300 fits more closely against the two first sides 1211. This is beneficial to maintaining the state where the branch bracket 300 is closely attached to the lumen bracket 100 under the continuous impact of blood flow, thereby helping to avoid endoleakage.

[0043] Please refer to Figure 1 and Figure 3 , in one embodiment, the enclosure 12 further includes a plurality of connecting portions 122 arranged at circumferential intervals. Axially, the plurality of connecting portions 122 are located at the distal ends of the plurality of baffles 121. In one embodiment, each connecting portion 122 includes two third sides 1221 spaced apart circumferentially and a fourth side 1222 connecting the two third sides 1221. There is a second gap T between two adjacent third sides 1221 of two adjacent connecting portions 122. One axial end of each third side 1221 is connected to the bracket body 11, and the other end is connected to the fourth side 1222. The two third sides 1221 and one fourth side 1222 form a connecting frame 1223 of the connecting portion 122. The third side 1221 and the fourth side 1222 are elastic metal rods, such as nickel-titanium alloy rods. A sealing film 1224 is further provided on the connecting frame 1223, and the sealing film 1224 is arranged on the connecting frame 1223 to make the connecting portion 122 airtight.

[0044] Please continue to refer to Figure 1 and Figure 3, in one embodiment, both first sides 1211 of any one of the baffles 121 are connected to two adjacent third sides 1221 of a pair of adjacent connecting portions 122. Axially, a second gap T between any one of the baffles 121 and the two adjacent connecting portions 122 is opposite to each other.

[0045] Please refer to Figure 7 , when the lumen stent 100 is in a radially expanded state, each connecting portion 122 forms an acute angle B with the central axis O of the stent body 11. Moreover, each connecting portion 122 can deflect relative to the stent body 11, and the connecting portion 122 is linked with the baffle 121. When each baffle 121 is deflected in a direction close to or away from the stent body 11 under an external force, the two adjacent connecting portions 122 connected to the baffle 121 are synchronously deflected in a direction away from or close to the stent body 11. Alternatively, when each connecting portion 122 is deflected in a direction away from or close to the stent body 11 under an external force, the baffle 121 connected to the two adjacent connecting portions 122 is synchronously deflected in a direction close to or away from the stent body 11.

[0046] When the branch stent 300 is released between two adjacent baffles 121, a radial extrusion force is applied to the connecting portions 122 connected to the two adjacent baffles 121. The connecting portions 122 move in a direction close to the central axis O under the radial extrusion force, so that the two first sides 1211 of the two adjacent baffles 121 connected to the connecting portions 122 are warped in a direction away from the stent body 11, thereby being able to better seal the pore between the branch stent 300 and the stent body 11, and thus avoiding or slowing down endoleakage.

[0047] In one embodiment, the plurality of frames 1212 and the plurality of connecting frames 1223 are of an integral structure. For example, it is an integral structure formed by bending and shaping a single elastic metal wire. In the natural state, the frame 1212 extends from the connection end with the stent body 11 towards the proximal end, and the connecting frame 1223 extends from the connection end with the stent body 11 towards the distal end. In one embodiment, the integral structure is connected to the stent body 11 by suture, so that the baffle 121 and the connecting portion 122 can deflect relative to the stent body 11.

[0048] In one embodiment, the branch stent 300 can be released within the second gap T formed by the two adjacent third sides 1221 of any two adjacent connecting portions 122. Based on the same principle as the release of the branch stent 300 within the first gap S formed by the two adjacent first sides 1211 of the two adjacent flaps 121 described above, after the branch stent 300 is completely released, the two third sides 1221 undergo elastic deformation and closely fit with the branch stent 300. Accordingly, the branch stent 300 can apply an extrusion force to the two adjacent third sides 1221 of the two adjacent connecting portions 122. At the same time, since the connecting frame 1223 of the connecting portion 122 can deflect relative to the stent body 11, the two adjacent third sides 1221 of the two adjacent connecting portions 122 are radially supported by the branch stent 300, so that the two adjacent connecting portions 122 are lifted radially to block the gap formed by the branch stent 300, the stent body 11, and the main blood vessel 200. And because the connecting portion 122 has a sealing property, blood flow from the gap formed by the branch stent 300, the stent body 11, and the main blood vessel 200 into the diseased area can be reduced or avoided. Therefore, the use of the lumen stent 100 in this embodiment can reduce endoleakage. In addition, since the connecting portions 122 in the enclosure 12 are evenly arranged circumferentially, the second gap T between any two adjacent connecting portions 122 can be passed through by the branch stent 300 and released within the second gap T. Therefore, the requirement for the circumferential position accuracy of the lumen stent 100 can be reduced, thereby improving the surgical efficiency.

[0049] Please refer to Figure 3 and Figure 8 , in one embodiment, in each connecting portion 122, the fourth side 1222 extends along a second arc between the two third sides 1221 connected thereto. The line connecting the ends of each fourth side 1222 connected to the two third sides 1221 can form a second line segment L2. The fourth side 1222 is symmetric about a straight line X2 passing through the midpoint of the second line segment L2 and perpendicular to the second line segment L2. And the second arc is curved in the direction towards the third side 1221, so that the shape of the fourth side 1222 is closer to the shape of the inner wall of the main blood vessel 200. Thus, the fourth side 1222 is more likely to fit with the inner wall of the main blood vessel 200 under the radial supporting forces of the stent body 11 and the branch stent 300, thereby reducing or avoiding endoleakage at the portion where the second side 1212 contacts the inner wall of the main blood vessel 200.

[0050] Please refer to Figure 1 and Figure 3, in one embodiment, the circumferential spacing between the two third sides 1221 of each connecting portion 122 first gradually decreases and then gradually increases from the connecting portion of the third side 1221 and the fourth side 1222 towards the connecting portion 122 of the third side 1221 and the stent body 11, so that a second clamping portion is formed in the second gap T formed by the adjacent two third sides 1221 of the adjacent two connecting portions 122. When the branch stent 300 is radially expanded in the gap T, it is clamped by the second clamping portion, so that the outer wall of the branch stent 300 fits more closely with the two third sides 1221, which is beneficial to maintaining the state where the branch stent 300 fits closely with the lumen stent 100 under continuous blood flow impact, thereby helping to avoid endoleakage.

[0051] It should be noted that, in other embodiments, the connecting portion 122 can be omitted, and endoleakage can be better avoided or reduced by the cooperation between the baffle 121 and the branch stent 300. When the connecting portion 122 is omitted, each baffle 121 can be fixedly connected to the end of the stent body 11 and form an angle with the surface of the stent body 11. Moreover, the baffle 121 can deflect relative to the surface of the stent body 11 under force, so that when the branch stent 300 presses the adjacent two first sides 1211 of the adjacent two baffles 121, the baffle 121 can deflect to block the gap formed between the branch stent 300, the lumen stent 100 and the main blood vessel 200.

[0052] However, by providing multiple connecting portions 122, the cooperation between the connecting portions 122 and the branch stent 300 can also better avoid or reduce endoleakage, so that when implanting the branch stent 300, the accuracy requirements for the circumferential position can be further reduced.

[0053] Furthermore, multiple connecting portions 122 and multiple baffles 121 are provided simultaneously, and each connecting portion 122 can deflect relative to the stent body 11 to drive the baffle 121 connected to the connecting portion 122 to deflect in the opposite direction. Or, each baffle 121 can deflect relative to the stent body 11 to drive the connecting portion connected to the baffle 121 to deflect in the opposite direction. Thus, when the branch stent 300 is clamped by the adjacent two connecting portions 122 and abuts against the baffle 121, the two connecting portions 122 can deflect to better block the gap formed by the branch stent 300, the stent body 11 and the main blood vessel 200 together. Or, when the branch stent 300 is clamped by the adjacent two baffles 121 and abuts against the connecting portion 122, the two baffles 121 can deflect to better block the gap formed by the branch stent 300, the stent body 11 and the main blood vessel 200 together.

[0054] In one embodiment, the radial support force of the stent body 11 is less than that of the branch stent 300. After the branch stent 300 and the lumen stent 100 are implanted, it is avoided that the branch stent 300 is radially expanded by the stent body 11, resulting in a reduction in the size of the inner lumen of the branch stent 300, thereby avoiding insufficient blood flow into the branch blood vessel.

[0055] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0056] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A lumen stent, which can be used in cooperation with a branch stent, is characterized in that, It includes a bracket body and a retaining fence. The bracket body is tubular and has a sealed tube wall. The retaining fence is connected to the bracket body. The retaining fence includes a plurality of baffles arranged at intervals in the circumferential direction. Each baffle includes an elastic frame and a sealing film provided on the frame. The frame includes two first sides spaced from each other in the circumferential direction and a second side connecting the two first sides. One end of the first side away from the second side is connected to the bracket body, and the frame is deflectable relative to the bracket body. There is a first gap between two adjacent first sides of two adjacent baffles. One end of the branch bracket can extend into the first gap and is clamped by the two adjacent first sides of the two adjacent baffles, and the branch bracket presses the two adjacent first sides so that the two adjacent first sides are radially supported by the branch bracket.

2. The lumen stent according to claim 1, characterized in that, The second side of each frame extends along a first arc between the two first sides connected thereto. A straight line connecting the two ends of each second side connected to the two first sides can form a first line segment. The second side is symmetric about a straight line passing through the midpoint of the first line segment and perpendicular to the first line segment. The first line segment is radially located between the first arc and the bracket body, and the first arc is curved in the direction towards the first side.

3. The luminal stent according to claim 1, characterized in that, The circumferential spacing between the two first sides of each baffle first gradually decreases and then gradually increases from the connection part of the first side and the second side to the connection part of the first side and the bracket body, so that a first clamping part is formed in the first gap, and the branch bracket can be clamped by the first clamping part.

4. The lumen stent according to claim 1, characterized in that, Each baffle is fixedly connected to the end of the bracket body, and each baffle forms an angle with the surface of the bracket body, and when the baffle is stressed, it can deflect relative to the surface of the bracket body.

5. The lumen stent according to claim 1, wherein The retaining fence further includes a plurality of connecting parts arranged at intervals in the circumferential direction. There is a second gap between two adjacent connecting parts. Each connecting part is connected to two adjacent first sides of two adjacent baffles. In the axial direction, any baffle is opposite to the second gap. Each connecting part can deflect relative to the bracket body to drive the baffle connected to the connecting part to deflect in the opposite direction, or each baffle can deflect relative to the bracket body to drive the connecting part connected to the baffle to deflect in the opposite direction.

6. The luminal stent according to claim 5, characterized in that, Each connecting part includes an elastic connecting frame and a film provided on the connecting frame. Each connecting frame includes two third sides spaced from each other in the circumferential direction and a fourth side connecting the two third sides. There is a second gap between two adjacent third sides of two adjacent connecting parts. The branch bracket can extend into the second gap and is clamped by the two adjacent third sides of the two adjacent connecting parts, and the two adjacent third sides are radially supported by the branch bracket.

7. The luminal stent according to claim 6, wherein The fourth side of each of the connecting frames extends along a second arc between the two third sides connected thereto. A connecting line between the ends of each fourth side connected to the two third sides can form a second line segment. The fourth side is symmetric about a straight line passing through the midpoint of the second line segment and perpendicular to the second line segment. The second line segment is radially located between the second arc and the bracket body. Moreover, the second arc bends towards the direction of the third side.

8. The luminal stent according to claim 6, characterized in that, The circumferential spacing between the two third sides of each of the connecting portions first gradually decreases and then gradually increases from the portion where the third side is connected to the fourth side towards the portion where the third side is connected to the bracket body, so that a second engaging portion is formed in the second gap, and the branch bracket can be engaged by the second engaging portion.

9. A lumen stent system, characterized in that, It includes a branch bracket and a lumen bracket according to any one of claims 1-8. One end of the branch bracket can extend into the first gap and be clamped by two adjacent first sides of two adjacent ones of the flaps, and the two adjacent first sides are radially supported by the branch bracket.

10. The lumen stent system according to claim 9, wherein The maximum circumferential distance of the first gap is not greater than 0.9 times the diameter of the branch bracket.

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