Covered stent
By designing a steering wave loop connecting the branch stent and the main stent, the problem of insufficient adaptability of the branch stent to the curvature of blood vessels was solved, and the self-adaptation and stable implantation of the covered stent in vivo were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIFETECH SCI (SHENZHEN) CO LTD
- Filing Date
- 2024-12-25
- Publication Date
- 2026-04-24
AI Technical Summary
In existing technologies, the curvature of branch stents is not well adapted to the curvature of branch vessels, which may lead to branch channel occlusion.
Design a covered stent, including a main stent and a branch stent. The branch stent is connected to the main stent by a steering coil, which can rotate circumferentially to adjust the bending direction of the branch stent and adapt to different vascular curvatures.
By adjusting the steering wave, the covered stent can adapt to the vascular morphology after implantation, reducing the risk of branch channel occlusion and improving bending flexibility and anchoring force.
Smart Images
Figure CN224155832U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a covered stent. Background Technology
[0002] Aortic diseases, such as aortic aneurysms, are among the most deadly and difficult-to-treat vascular surgical diseases. Traditional treatments involve surgery, which carries risks of significant trauma and high mortality. In recent years, a minimally invasive and simple interventional procedure has been developed, involving the implantation of a covered stent at the site of the diseased vessel. The covered stent adheres tightly to the inner wall of the vessel, isolating the diseased area from blood flow. The covered stent allows normal blood flow while protecting the diseased vessel, effectively repairing the vascular lesion. The iliac arteries include the common iliac artery, external iliac artery, and internal iliac artery. Current techniques for treating iliac artery aneurysms involve endovascular treatment, implanting an iliac artery bifurcation stent and an internal iliac covered stent to reconstruct the artery. Current iliac artery bifurcation stents typically have two branch channels, one for reconstructing the internal iliac artery and the other for the external iliac artery.
[0003] Reconstructing the iliac artery requires the use of a delivery device to deliver a stent to the site where the iliac artery has branches and release it. Therefore, the fit of the stent shape to the vascular morphology is particularly important. When it is necessary to establish vascular branches, the shape of the product branches and the overall size need to be considered at the same time to better fit the curvature of the patient's branch vessels. When the curvature fit is not good, there may be problems with branch channel occlusion. Utility Model Content
[0004] Therefore, it is necessary to provide a new bifurcated covered stent to at least solve the problem of adapting the tortuous shape of the branch stent to the tortuous shape of the branch vessel.
[0005] A covered stent includes a main stent and a branch stent. The main stent includes a distal segment, a transition segment, and a proximal segment along the axial direction. The transition segment connects the distal segment and the proximal segment. A branch connection port is provided on the side wall of the transition segment. The branch stent communicates with the main stent through the branch connection port. The side of the branch stent connected to the branch connection port includes a steering wave ring. The steering wave ring and the branch connection port are rotatably connected in the circumferential direction. Rotating the steering wave ring allows the branch stent to bend in different directions in its natural state.
[0006] In one embodiment, the steering wave ring includes, along the axial direction, a first port connected to the branch connection port and a second port away from the branch connection port, wherein the first port is an oblique opening.
[0007] In one embodiment, the second port is a flat opening or a beveled opening.
[0008] In one embodiment, the steering wave ring includes a long sidewall and a short sidewall in the circumferential direction, the axial length of the long sidewall is greater than the axial length of the short sidewall, the long sidewall is disposed near the proximal segment, and the short sidewall is disposed near the distal segment.
[0009] In one embodiment, the branch connection port is provided with a plurality of first rings along the circumferential direction, and the steering wave ring further includes a rotating ring, which passes through the plurality of first rings. The first port is fixedly connected to the rotating ring on the side near the proximal segment and / or on the side near the distal segment.
[0010] In one embodiment, the rotating ring is integrally formed from the developing material.
[0011] In one embodiment, the steering wave ring includes an arc-shaped rod extending circumferentially, the arc-shaped rod being located between the distal and proximal sides of the branch connection port, and at least one second ring being provided at the position opposite to the arc-shaped rod at the branch connection port, the arc-shaped rod passing through the second ring.
[0012] In one embodiment, the angle formed by the lines connecting the two ends of the arc-shaped rod to the center of the radial section of the steering wave ring is less than or equal to 90°.
[0013] In one embodiment, the side of the branch bracket connected to the branch connection port includes a double-layered film portion, and the steering wave ring is movably embedded in the inner cavity of the double-layered film portion.
[0014] In one embodiment, the double-layer coating includes an inner surface coating located on the inner surface of the steering wave ring and an outer surface coating located on the outer surface of the steering wave ring, wherein the outer surface coating has an operation hole.
[0015] In one embodiment, the distal end of the branch support away from the main support includes an anchoring wave ring, the radial support force of which is greater than or equal to the radial support force of the steering wave ring.
[0016] The beneficial effects of this application are as follows: A covered stent is provided, comprising a main stent and a branch stent. The main stent includes a distal segment, a transition segment, and a proximal segment along the axial direction. A branch connection port is provided on the sidewall of the transition segment, and the branch stent is connected to the branch connection port. The side of the branch stent connected to the branch connection port includes a steering coil, which is rotatable, allowing the branch stent to bend in different directions in its natural state. When connected to the main stent, the steering coil tends to guide the branch stent it is located to tilt to one side. The steering coil and the branch connection port establish a circumferentially rotatable connection. By rotating the orientation of the steering coil, the tilting direction of the steering coil changes, thereby changing the bending direction of the branch stent. When this covered stent is implanted into the body of the recipient, the steering coil can be adjusted according to the relative bending shape of the branch vessel and the main vessel at the target vascular location obtained from the user, thereby obtaining a suitable covered stent structure. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the film-coated support of this utility model;
[0018] Figure 2 This is a schematic diagram of the structure of the steering wave ring of this utility model within the film-coated bracket;
[0019] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the double-layer film coating part of this utility model;
[0020] Figure 4 A schematic diagram of the structure of the double-layer coating part of this utility model with an operation hole;
[0021] Figure 5 This is a schematic diagram of the steering wave coil structure in Embodiment 1 of this utility model;
[0022] Figure 6 This is a schematic diagram of the steering wave ring connecting the rotating ring in Embodiment 2 of this utility model;
[0023] Figure 7 Schematic diagram of the collar structure provided at the branch connection port in Embodiments 2 and 3 of this utility model;
[0024] Figure 8 This is a schematic diagram of the connection structure between the rotating ring and the first set of rings in Embodiment 2 of this utility model;
[0025] Figure 9 This is a schematic diagram of the arc-shaped rod structure provided for the steering wave ring in Embodiment 3 of this utility model;
[0026] Figure 10 This is a schematic diagram of the connection structure between the arc-shaped rod and the second collar in Embodiment 3 of this utility model. Detailed Implementation
[0027] To better understand the concept of this application, the implementation methods of this application will be described in detail below with reference to the accompanying drawings. The following specific embodiments are only some embodiments of this application and are not intended to limit this application.
[0028] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.
[0029] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0030] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used here as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end of the blood vessel furthest from the heart, and "proximal" refers to the end of the blood vessel closest to the heart; "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction; "upper end" and "lower end" refer to two relatively distant ends, and when one end is defined as "upper end", the other distant end is "lower end".
[0031] This application provides a covered stent 100; please refer to [link / reference]. Figures 1-4The system includes a main support 10 and branch supports 4. Both the main support 10 and branch supports 4 typically include a support frame distributed along their respective axial directions and a covering film applied to the surface of the support frame. The main support 10 includes a distal segment, a transition segment, and a proximal segment along its axial direction. The transition segment connects the distal and proximal segments, and a branch connection port 5 is provided on the side wall of the transition segment. After the branch supports 4 are connected to the branch connection port 5, they communicate with the main support 10. The side of the branch supports 4 connected to the branch connection port 5 includes a steering wave ring 41. The steering wave ring 41 and the branch connection port 5 form a circumferentially rotatable connection, allowing the branch supports 4 to bend in different directions in its natural state after connection. Here, after the branch supports 4 of the bifurcated covered stent 100 are connected to the main support 10, the bending direction near the connection point is usually defined by the structure of the support frame at the connection position between the branch supports 4 and the main support 10. This application connects the branch supports 4 to the branch connection... The support frame at the connection port 5 is set as a steering wave coil 41. The structure of the steering wave coil 41 is designed such that when the port at one end of the connection to the main stent 10 is connected to the main stent 10, the steering wave coil 41 itself has the tendency to guide the tube body (i.e. the tube body where the branch stent 4 is located) to tilt to one side. The steering wave coil 41 establishes a circumferentially rotatable connection with the branch connection port 5. By rotating the orientation of the steering wave coil 41, the tilting direction of the steering wave coil 41 can be changed, thereby causing the tube body where the branch stent 4 is located to tilt or bend. When the user implants the stent into the body of the recipient, the steering wave coil 41 can be adjusted according to the relative bending shape of the branch blood vessel and the main blood vessel at the target blood vessel location obtained by the user, thereby obtaining a suitable covered stent 100 structure. Then, the adjusted covered stent 100 is compressed and placed into the delivery sheath and delivered to the target blood vessel location.
[0032] Please refer to Figure 2 and Figure 4The side of the branch stent 4 connected to the branch connection port 5 includes a double-layer covering part 42. The double-layer covering part 42 includes an inner surface covering 422 located on the inner surface of the turning wave coil 41 and an outer surface covering 421 located on the outer surface of the turning wave coil 41. The double-layer covering structure forms a hollow internal space 423. The turning wave coil 41 is movably embedded in the internal space 423 of the double-layer covering part 42. The sidewall of the turning wave coil 41 can rotate circumferentially in the internal space 423 without being connected to the inner surface covering 422 and the outer surface covering 421. Under the protection of the double-layer covering, the turning wave coil 41 can avoid direct contact with blood when the implanted small branch does not extend to the position of the turning wave coil 41. Furthermore, due to the movable design of the steering coil 41, it may experience a certain degree of circumferential displacement under long-term blood flow. The double-layered covering 42 ensures that when the steering coil 41 shifts, the displacement is blocked by the inner and outer surface coverings 422 and 421, preventing direct contact with the vessel wall or the implanted stent itself, thus avoiding blood leakage and damage to the vessel wall. In another embodiment, an operating hole 44 can be provided on the outer surface covering 421 along the circumference of the branch stent 4, allowing the operator to directly manipulate the internal steering coil 41 through the operating hole 44 for steering. After steering is completed through the operating hole 44, the steering coil 41 and the outer surface covering 421 can be sutured and fixed to the curved structure of the branch stent 4 through the operating hole 44.
[0033] In this embodiment, in order to ensure that the branch support 4 has sufficient anchoring length to provide sufficient anchoring force with the small support, the end of the branch support 4 away from the steering wave ring 41 is also provided with an anchoring wave ring 43. The anchoring wave ring 43 can be connected only to the outer surface coating 421 and exposed on the outer wall of the branch support 4. Furthermore, the radial support force of the anchoring wave ring 43 can be greater than the radial support force of the steering wave ring 41 to maintain a better lumen shape for implanting the small support. For example, the anchoring wave ring 43 has a mesh structure.
[0034] Example 1:
[0035] In this embodiment, please refer to Figure 2 and Figure 5The steering wave coil 41 includes a first port 411 connected to the branch connection port 5 and a second port 412 away from the branch connection port 5 along the axial direction. The first port 411 is beveled. Here, when the steering wave coil 41 is connected to the main support 10 through the first port 411, because the first port 411 is beveled, the tube body where the steering wave coil 41 is located can tilt when it is attached to the outer surface of the main support 10. The central axis of the tube body where the steering wave coil 41 is located is no longer perpendicular to the central axis of the main support 10. However, by setting the connection between the first port 411 and the branch connection port 5 to be a circumferentially rotatable connection, the tilt direction of the tube body where the steering wave coil 41 is located can change accordingly during rotation. Furthermore, the end opposite to the first port 411 is the second port 412, which can be set as a flat or beveled opening.
[0036] In one embodiment (not shown in the figure), when the opening is beveled, the direction of the bevel can be opposite to the tilt direction of the first port 411, thereby forming a long sidewall 413 and a short sidewall 414 circumferentially in the turning wave ring 41. The axial length of the long sidewall 413 is greater than the axial length of the short sidewall 414. The long sidewall 413 is positioned closer to the proximal segment, and the short sidewall 414 is positioned closer to the distal segment. Thus, in the tilt direction of the branch stent 4, the axial support length of the short sidewall 414 is shortened, resulting in less resistance to the branch stent 4 when bending in that direction, improving bending flexibility, and preventing the branch stent 4 from bending after bending. The long sidewall 413, located on the opposite side of the tilt direction, can provide a longer anchoring length to ensure anchoring force with the implanted small stent, and the long sidewall 413 can better guide the branch stent 4 to tilt and bend towards the short sidewall 414.
[0037] In another embodiment, not shown in the figure, when the opening is flat, the direction of the bevel can be the same as the tilt direction of the first port 411 and the first port 411 and the second port 412 can be set parallel to each other. This setting can make the length of the small stent anchored in the circumferential direction the same when the branch stent 4 is implanted, thereby enhancing the anchorage of the small stent in the branch stent 4.
[0038] Example 2:
[0039] In this embodiment, please refer to Figures 6-8The structure is the same as in Embodiment 1 and will not be described again. The difference is that the steering wave ring 41 also includes a rotating ring 415, which is circumferentially rotatable to the main support 10. Specifically, the branch connection port 5 of the main support 10 is provided with multiple first rings 6 circumferentially. The first rings 6 are connected circumferentially along the branch connection port 5. After connection, the first rings 6 provide holes for the rotating ring 415 to pass through, so that the rotating ring 415 with the annular structure can rotate circumferentially along the multiple first rings 6 after passing through the holes. Further, the side of the first port 411 near the proximal section and / or the side of the first port 411 near the distal section is fixedly connected to the rotating ring 415. The steering wave ring 41 forms wave peaks with multiple waveforms at the first port 411. At least one wave peak located near the proximal section and near the distal section is fixedly connected to the rotating ring 415, while other positions are not connected. Thus, the rotating ring 415 can rotate along the first rings 6 at all positions except the position fixedly connected to the steering wave ring 41.
[0040] In this embodiment, please refer to Figure 6 The connection between the rotating ring 415 and the first port 411 of the steering wave ring 41 can be made by a connecting rod 416. The length of the connecting rod 416 only needs to be slightly larger than the diameter of the first ring 6. Figure 6 As shown, a gap H1 slightly larger than the diameter of the first ring 6 can be formed between the first port 411 and the rotating ring 415. This ensures that the first ring 6 avoids colliding and blocking the first port 411 when the rotating ring 415 rotates and slides on the surface of the rotating ring 415. Fixing the side of the first port 411 near the proximal segment and / or the side of the first port 411 near the distal segment to the rotating ring 415 ensures that when the main support 10 and the branch support 4 are compressed and inserted into the outer sheath, the compression of the middle two sides between the proximal and distal segments is not affected. Here, the main support 10 is typically compressed radially during compression, and the radial direction of the main support 10 is the middle two sides of the branch support 4 between the proximal and distal segments. Therefore, maintaining good compression performance in this area ensures that the arrangement of the rotating ring 415 minimizes its impact on the overall compressed dimensions of the covered support 100.
[0041] In another embodiment, the rotating ring 415 may be integrally formed from a metal developing material, such as tantalum wire, platinum-iridium wire, or gold wire.
[0042] Example 3:
[0043] In this embodiment, please refer to Figure 9 and Figure 10The same structure as in Embodiments 1 and 2 will not be described again. The difference is that the steering wave ring 41 does not have a rotating ring 415. Both sides of the steering wave ring 41 away from the distal end and the proximal end include arc-shaped rods 417 extending in the circumferential direction. The arc-shaped rods 417 are circular arcs. At least one second ring 61 is provided at the position opposite to the arc-shaped rods 417 of the branch connection port 5. The arc-shaped rods 417 are respectively inserted into the second rings 61. Here, the purpose of setting the arc-shaped rods 417 on both sides of the steering wave ring 41 away from the distal end and the proximal end is, firstly, to facilitate the setting of long sidewalls 413 and segment sidewalls on the sidewalls near the proximal end and the distal end. Secondly, the wave-like structure is preserved on the sidewalls near the proximal and distal segments. This ensures that when the main stent 10 and branch stent 4 are compressed and inserted into the outer sheath, the compression at least does not affect the compression on the middle sides between the proximal and distal segments. Here, the main stent 10 is typically compressed radially, and the radial direction of the main stent 10 is the middle sides of the branch stent 4 located between the proximal and distal segments. Therefore, maintaining good compression performance in this area ensures that the setting of the rotating ring 415 minimizes its impact on the overall compressed dimensions of the covered stent 100. The projection of the deflecting wave ring 41 with the arc-shaped rod 417 onto the plane of the first port 411 is circular, thus ensuring a complete circular lumen for subsequent small stent implantation.
[0044] For details, please continue reading. Figure 10 Two second annular sleeves can be provided, respectively located on the radially symmetrical sides of the branch connection port 5. The arc-shaped rods 417 on both sides of the steering wave ring 41 pass through the second annular sleeves and are connected to the branch connection port 5 in a circumferentially rotatable manner. Here, the angle through which the arc-shaped rods 417 rotate is the angle through which the steering wave ring 41 can rotate circumferentially. Typically, the angle of twist between the branch vessels and the main vessels of the covered stent 100 with the implanted object will not exceed 180°, provided that blood can pass through. Therefore, the angle α formed by the lines connecting the two ends of the arc-shaped rods 417 on both sides to the center of the radial cross-section of the steering wave ring 41 is less than or equal to 90°. Figure 10 As shown, this ensures that the angle through which the steering coil 41 can rotate is less than 180°. For branch vessels with a tortuosity greater than 180°, stents with other curved structures should be used.
[0045] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A covered stent, characterized in that, The system includes a main support and branch supports. The main support includes a distal section, a transition section, and a proximal section along the axial direction. The transition section connects the distal section and the proximal section. A branch connection port is provided on the side wall of the transition section. The branch supports are connected to the main support through the branch connection port. The side of the branch supports connected to the branch connection port includes a steering wave ring. The steering wave ring and the branch connection port are rotatably connected in the circumferential direction. Rotating the steering wave ring allows the branch supports to bend in different directions in their natural state.
2. The covered stent according to claim 1, characterized in that, The steering wave ring includes a first port connected to the branch connection port and a second port away from the branch connection port along the axial direction, wherein the first port is an oblique opening.
3. The covered stent according to claim 2, characterized in that, The second port is either a flat or beveled opening.
4. The covered stent according to claim 3, characterized in that, The steering wave ring includes a long sidewall and a short sidewall in the circumferential direction. The axial length of the long sidewall is greater than the axial length of the short sidewall. The long sidewall is disposed near the proximal end segment, and the short sidewall is disposed near the distal end segment.
5. The covered stent according to claim 2, characterized in that, The branch connection port is provided with a plurality of first rings along the circumference. The steering wave ring also includes a rotating ring. The rotating ring passes through the plurality of first rings. The side of the first port near the proximal segment and / or the side of the first port near the distal segment is fixedly connected to the rotating ring.
6. The covered stent according to claim 5, characterized in that, The rotating ring is integrally formed from the developing material.
7. The covered stent according to claim 2, characterized in that, The steering wave ring includes an arc-shaped rod extending circumferentially. The arc-shaped rod is located between the distal and proximal ends of the branch connection port. At least one second ring is provided at the position opposite to the arc-shaped rod at the branch connection port, and the arc-shaped rod passes through the second ring.
8. The covered stent according to claim 7, characterized in that, The angle formed by the lines connecting the two ends of the arc-shaped rod to the center of the radial section of the steering wave ring is less than or equal to 90°.
9. The covered stent according to any one of claims 1-8, characterized in that, The side of the branch bracket connected to the branch connection port includes a double-layer film portion, and the steering wave ring is movably embedded in the inner cavity of the double-layer film portion.
10. The covered stent according to claim 9, characterized in that, The double-layer coating includes an inner surface coating located on the inner surface of the steering wave ring and an outer surface coating located on the outer surface of the steering wave ring, and the outer surface coating has an operation hole.
11. The covered stent according to claim 1, characterized in that, The branch support, on its distal side away from the main support, includes an anchoring wave ring, the radial support force of which is greater than or equal to the radial support force of the steering wave ring.