Covered stent and delivery system
By designing the distal main body of the covered stent to form an angle with the branch, and using the freely movable distal tube segment and traction wire for adjustment, the problem of inaccurate branch channel alignment in the existing technology is solved, thus improving surgical efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIFETECH SCI (SHENZHEN) CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-28
AI Technical Summary
Existing iliac artery bifurcation stents have limitations in the length of branch channels when treating iliac artery aneurysms, and the branches cannot be accurately aligned with the branch channels, resulting in low surgical efficiency.
Design a membrane support, the distal body of which includes a first branch and a second branch arranged radially, the first branch and the second branch forming an angle, and the distal tube segment can move freely and be adjusted in conjunction with the traction wire in the delivery system.
It improves the accuracy of branch orifice alignment, increases surgical efficiency, and avoids the risk of occlusion caused by compression of the branch stent.
Smart Images
Figure CN224557606U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a covered stent and delivery system. Background Technology
[0002] The iliac arteries include the common iliac artery, external iliac artery, and internal iliac artery. Current technology for treating iliac artery aneurysms involves endovascular treatment, implanting an iliac artery bifurcation stent and an internal iliac artery covered stent to reconstruct the arterial vessel. Existing commercially available bifurcation iliac artery bifurcation stents are designed to better suit the anatomy of Chinese individuals, and their effectiveness has been clinically proven. However, they still have limitations. Due to concerns about aneurysm compressing the branch channels, preventing them from expanding, the length of the branch channels is limited. Some products have been improved by designing the branches in a curved shape to extend their connection length. However, maintaining the curved shape of the branches limits their flexibility, making it difficult to accurately align the branches with the branch channels. Utility Model Content
[0003] Therefore, it is necessary to provide a covered stent, including a proximal body and a distal body. The distal body includes a first branch and a second branch arranged radially, with the proximal ends of the first branch and the second branch communicating with the proximal body. The first branch is at least partially bent toward the second branch and then fixedly connected to the outer wall of the second branch. After connection, the central axis of the first branch and the central axis of the second branch form an angle. The first branch includes a distal tube segment away from the proximal body, and the distal end of the distal tube segment includes a distal port. The distal tube segment, including at least the portion with the distal port, is freely movable.
[0004] In one embodiment, the first branch includes a proximal tube segment connected to the proximal body, and at least a portion of the outer wall of the proximal tube segment is connected to the outer wall of the second branch.
[0005] In one embodiment, the first branch includes a support frame and a surface coating disposed on the surface of the support frame, the surface coating covering the inner and / or outer surfaces of the support frame, and at least the support frame and / or the surface coating of the proximal tube segment are fixedly connected to the second branch.
[0006] In one embodiment, the support frame includes a plurality of first wave coils, with adjacent first wave coils along the axial direction spaced apart or interlocked.
[0007] In one embodiment, a plurality of the first wave coils are spaced apart in the proximal pipe section, and the first wave coils are spaced apart or interlocked in the distal pipe section.
[0008] In one embodiment, the distal end of the first branch near the outer wall of the second branch includes a first movable limiting member, and the second branch is provided with a second movable limiting member at a position opposite to the first movable limiting member. One of the first movable limiting member and the second movable limiting member includes a fixing member, and the other includes a sliding member. The fixing member has a track extending along the length direction, and the sliding member can slide along the track.
[0009] In one embodiment, the second branch includes a support frame and a surface coating disposed on the surface of the support frame, and the fixing member or the sliding member is disposed on the support frame and / or the surface coating of the second branch.
[0010] In one embodiment, the sliding member includes a polymer ring sleeved on the fixing member, and the polymer ring is formed on the surface coating or the support skeleton of the first branch and the second branch where the fixing member is not provided.
[0011] In one embodiment, the fastener includes a polymer wire formed on the surface coating or the support frame, or the fastener includes a metal connecting rod with its two ends fixedly connected to the support frame.
[0012] In one embodiment, the angle formed by the line connecting the projections of the central axis of the distal pipe segment and the central axis of the second branch onto a plane parallel to both central axes is 0° to 90°.
[0013] A delivery system includes a delivery handle and a film-coating support. The delivery handle includes an operating part, a sheath, and a traction wire. The traction wire passes through the operating part and the sheath, with its two ends exiting from the distal end of the operating part and the proximal end of the sheath, respectively. After exiting the sheath, the proximal end of the traction wire establishes a detachable connection with the distal end of a first branch.
[0014] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model provides a covered stent and delivery system. The covered stent includes a proximal body and a distal body. The distal body includes a first branch and a second branch arranged radially. The proximal ends of the first branch and the second branch are connected to the proximal body. The first branch is bent at least partially toward the second branch and fixedly connected to the outer wall of the second branch. After connection, the central axis of the first branch and the central axis of the second branch form an angle, which facilitates the adaptation of the first branch to the vascular orifice of the bifurcation. The first branch includes a distal tube segment away from the proximal body. The distal end of the distal tube segment includes a distal port. The distal tube segment, including at least the portion with the distal port, is freely movable. In this way, the distal end of the first branch can adapt and adjust its orientation, so that it can be adjusted in time when the alignment is inaccurate, thereby further ensuring the accuracy of the branch orifice alignment and improving surgical efficiency. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the first wave interval setting structure of the film-coated support in an embodiment of this utility model.
[0016] Figure 2 This is a schematic diagram of the structure of the first wave interval and the interlocking arrangement of the film-coated support in an embodiment of this utility model.
[0017] Figure 3 This is a schematic diagram of the interlocking structure of the first wave ring of the film-coated support in an embodiment of this utility model.
[0018] Figure 4 This is a schematic diagram of the first branch support frame and the second branch fixing structure in an embodiment of this utility model.
[0019] Figure 5 This is a schematic diagram of the fixing structure of the first branch and the second branch in an embodiment of this utility model.
[0020] Figure 6 This is a schematic diagram of the first branch surface coating and the second branch fixing structure in an embodiment of the present invention.
[0021] Figure 7 This is a schematic diagram of the structure of the first branch and the second branch with movable limiting members in the embodiment of this utility model.
[0022] Figure 8 This is a schematic diagram of the structure of the movable limiting member made of polymer material in the embodiment of this utility model.
[0023] Figure 9 This is a schematic diagram of the structure in which the movable limiting member is respectively disposed in the first branch and the second branch in the embodiment of this utility model.
[0024] Figure 10 This is a schematic diagram of the connection structure between the fixing member and the sliding member in an embodiment of this utility model.
[0025] Figure 11 This is a schematic diagram of a metal connecting rod structure for the movable limiting component in this embodiment of the present invention.
[0026] Figure 12 This is a schematic diagram of the connection structure between the metal connecting rod and the supporting frame in an embodiment of this utility model.
[0027] Figure 13 This is a schematic diagram showing the swing angle of the distal pipe section of the first branch in an embodiment of this utility model.
[0028] Figure 14 This is a schematic diagram of the conveying handle structure in an embodiment of this utility model.
[0029] Figure 15 This is a schematic diagram of the connection structure between the traction wire of the conveying handle and the first branch in an embodiment of this utility model.
[0030] Figure 16 This is a schematic diagram showing the connection between the traction wire and the first wave coil via a slip knot structure in an embodiment of this utility model.
[0031] Figure 17 This is a schematic diagram of step 1 of binding the slipknot structure in an embodiment of this utility model.
[0032] Figure 18 This is a schematic diagram of step 2 of binding the slipknot structure in an embodiment of this utility model.
[0033] Figure 19 This is a schematic diagram of step 3 of binding the slipknot structure in an embodiment of this utility model.
[0034] Figure 20 This is a schematic diagram of step 4 of the knot binding process in an embodiment of this utility model. Detailed Implementation
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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".
[0039] 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.
[0040] Please see Figure 1 and Figure 2This application provides a covered stent 100, including a proximal body 1 and a distal body 2. The distal body 2 includes a first branch 21 and a second branch 22 arranged radially. The proximal ends of the first branch 21 and the second branch 22 communicate with the proximal body 1. The proximal body 1 is typically the inlet of blood into the covered stent 100. After inflow, due to the arrangement of the first branch 21 and the second branch 22, the blood is diverted to different branch vessels at the distal body 2. When the covered stent 100 provided in this application is applied to the iliac artery, the proximal body 1 is typically located within the common iliac artery, and the second branch 22 is used to connect to the external iliac branch. The first branch 21 is typically used to establish a blood flow pathway between the proximal main body 1 and the internal iliac branch vessels in conjunction with the subsequently implanted internal iliac branch stent. The first branch 21 bends at least partially towards the second branch 22 and connects to the outer wall of the second branch 22, forming an angle between the central axis of the first branch 21 and the central axis of the second branch 22. Here, setting the first branch 21 and the second branch 22 to form an angle between their central axes is mainly used to adapt to the bifurcation structure of the external and internal iliac branch vessels, ensuring that after the covered stent 100 is accurately positioned and released within the vessel, each branch is located within the target vessel, while the first branch... The distal port 213 of branch 21 is aligned with the branch opening of the internal iliac branch vessel. Here, although the stent's position within the vessel can be slightly adjusted during the partially released state before the complete deployment of the covered stent 100, the movement and collision of the delivery device within the covered stent 100 during subsequent implantation of the internal iliac branch stent after release could potentially lead to further displacement of the covered stent 100. This would result in inaccurate alignment of the distal port 213 of the first branch 21 with the branch opening of the vessel, further contributing to the failure of internal iliac reconstruction. Therefore, to further address the problem of inaccurate alignment, the first branch 21 of the covered stent 100 in this application includes a portion distal to the proximal end... The distal segment 212 of the main body 1 includes a distal port 213. At least the portion of the distal segment 212 including the distal port 213 is freely movable. Here, the portion of the distal segment 212 of the first branch 21, including the distal port 213, is designed as a freely movable structure. This allows the distal port 213 of the first branch 21 to deform to a certain extent after the covered stent 100 is fully released, even if the alignment with the vascular branch opening is not perfect. This prevents subsequent implantation of the internal iliac branch stent due to misalignment, thus avoiding stent occlusion and other adverse situations. Furthermore, if misalignment with the vascular branch opening is observed, the distal segment 212 or the distal port 213 can be pulled and adjusted using methods such as setting a traction wire. This ensures accurate alignment of the initially misaligned first branch 21, guaranteeing the accuracy of subsequent implantation of the internal iliac branch stent.
[0041] In this embodiment, the first branch 21, along its length, may include a proximal tube segment 211 closer to and connected to the proximal body 1, depending on its distance from the proximal body 1. At least a portion of the outer wall of the proximal tube segment 211 is connected to the outer wall of the second branch 22. Here, connecting and fixing at least a portion of the proximal tube segment 211 of the first branch 21 to the outer wall of the second branch 22 ensures the basic angle formed between the first branch 21 and the second branch 22. This angle typically matches the angle formed by the internal and external iliac arteries in the human body, usually between 0° and 90°, and more specifically between 30° and 60°. Furthermore, the connection between the proximal tube segment 211 and the outer wall of the second branch 22 ensures the compactness of the first branch 21 and the second branch 22, thereby reducing the radial dimension when the stent is compressed into the sheath, and thus enabling better accommodation and delivery of the covered stent 100. Furthermore, the first branch 21 includes a support frame 214 arranged along its own length direction and a surface coating 216 disposed on the surface of the support frame 214. The surface coating 216 can cover the inner surface of the support frame 214 or the outer surface of the support frame 214.
[0042] In another embodiment, please refer to Figures 1-3 The support frame 214 includes first corrugated coils 2141. Two axially adjacent first corrugated coils 2141 are spaced apart or interlocked. When two axially adjacent first corrugated coils 2141 are spaced apart, a gap consisting only of the coating is formed between the coils, resulting in good bending performance. When two axially adjacent first corrugated coils 2141 are interlocked, the overall support frame 214 of the first branch 21 forms a mesh structure 215, providing better internal cavity support performance without significantly affecting the overall bending performance of the first branch 21. For details, please refer to [further details]. Figure 2 The first wave coils 2141 in the proximal segment 211 of the first branch 21 are spaced apart, while the first wave coils 2141 in the distal segment 212 of the first branch 21 are interlocked. In this way, the portion of the first wave coil 2141 in the proximal segment 211 has better bending performance, thus avoiding bending when the first branch 21 bends towards the second branch 22 to form an angle. The portion of the first wave coil in the distal segment 212 forms a mesh structure 215 with better radial support, thus better ensuring the opening shape of the distal port 213 and preventing the distal port 213 from being blocked due to compression of the blood vessel and subsequent free movement, which would affect the selection of the subsequent guidewire.
[0043] In this embodiment, please refer to Figures 4-6The surface coating 216 covers the inner and outer surfaces of the support frame 214, and at least the support frame 214 and / or surface coating 216 of the proximal pipe segment 211 are fixedly connected to the outer wall of the second branch 22 by a fixing connector 3. Here, the second branch 22 is typically also provided with a support frame 214 and a surface coating 216 arranged axially thereon; therefore, please refer to... Figure 4 When the support frame 214 of the first branch 21 is fixedly connected to the outer wall of the second branch 22, the connection can be achieved by stitching, bonding, or welding between the support frame 214 of the first branch 21 and the support frame 214 of the second branch 22 using a fixing connector 3. Please refer to [link / reference]. Figure 5 When the supporting frame 214 of the first branch 21 is connected to the surface coating 216 of the second branch 22, the connection can be achieved by stitching or bonding using a fixing connector 3. Similarly, please refer to... Figure 6 The first branch 21 can also be connected to the support frame 214 of the second branch 22 or the surface coating 216 via a fixing connector 3.
[0044] In one embodiment (not shown in the figure), the proximal end of the first branch 21 includes a first support frame connected to the proximal body 1, and the proximal end of the second branch 22 includes a second support frame connected to the proximal body 1. The first and second support frames can be integrally formed supports. Here, integral forming means that when the support frame 214 is formed, a figure-eight-shaped wave coil structure is directly formed, and the cross-section of the wave coil of the first support frame and the cross-section of the wave coil of the second support frame are two cross-sections that intersect at an angle. With this configuration, the first support frame will guide the first branch 21 and the second branch 22 to form an angle starting from the proximal end. At the same time, the integral figure-eight-shaped wave coil structure can have a partial omission of the support frame 214 structure in the middle position, thereby having better compression dimensions at that position, which is beneficial to the dimensions when the covered stent 100 is compressed into the sheath.
[0045] In one embodiment, see Figure 7 and Figure 8To prevent the freely movable portion of the distal pipe segment 212 from swinging arbitrarily and causing the orientation of the distal port 213 to become uncontrollable, the distal pipe segment 212 of the first branch 21 can be further provided with a first movable limiting member 217 near the outer wall of the second branch 22. A second movable limiting member 221 is provided at the position opposite to the first movable limiting member 217 of the second branch 22. One of the first movable limiting member 217 and the second movable limiting member 221 includes a fixing member 2211, and the other includes a sliding member 2171. The fixing member 2211 has a track extending along the length direction, and the sliding member 2171 is slidably connected to the fixing member 2211. Here, the arrangement of the first movable limiting member 217 and the second movable limiting member 221 restricts the freely movable portion of the distal pipe segment 212 of the first branch 21 to a certain orientation, such as restricting its movement away from the second branch 22, so as to prevent the distal port 213 of the first branch 21 from deviating in an undesirable direction. Therefore, the first movable limiting member 217 and the second movable limiting member 221 further include a fixing member 2211 and a sliding member 2171. The fixing member 2211 forms a track with length and orientation restrictions, and the sliding member 2171 is slidably connected to the track of the fixing member 2211. This allows the freely movable part of the first branch 21 to swing relative to the second branch 22 only within the restricted orientation and track formed by the fixing member 2211. This achieves an adaptive shift in the position of at least the far end 213 of the first branch 21 while preventing arbitrary swinging that could lead to an undesirable orientation of the far end 213.
[0046] Please refer to Figures 8-10 The fastener 2211 and the sliding element 2171 can be disposed on the support frame 214 of the first branch 21 or the second branch 22, or on the surface coating 216. When disposed on the support frame 214, they can be fixed by sewing, bonding, or welding. When disposed on the surface coating 216, they can be disposed by sewing and bonding. Please refer to further details here. Figure 10The fastener 2211 includes fixing points 2213 at both ends along its length. The fixing points 2213 are fixedly connected to the bracket. The track 2212 is disposed between the fixing points 2213. The fastener 2211 can be a polymer thread of a certain length. The polymer thread can be a rigid material or a soft material, and can be made of the same material as the stitching or coating of the first branch 21 or the second branch 22, such as PET or PTFE. In this embodiment, the fastener 2211 can be connected to the adjacent support frame 214 by sewing. The two fixing points 2213 are respectively sewn between two adjacent support frames 214 in the axial direction. Here, if two adjacent metal frames are spaced apart using first wave coils 2141, the two fixing points 2213 of the fixing member 2211 are respectively connected to the crests and / or troughs of the two adjacent first wave coils 2141 that are close to each other in the axial direction. The curved structure of the crests and troughs of the first wave coils 2141 prevents the fixing member 2211 from sliding arbitrarily on the wave rod, thereby ensuring the stability of the relative position of the fixing member 2211. When two adjacent support frames 214 are mesh supports, since the mesh supports have a rectangular or rhomboid mesh structure, the two fixing points 2213 can be respectively connected to two opposite corners in the axial direction within a single mesh. In this way, fixing at the corners also prevents the fixing member 2211 from sliding arbitrarily on the wave rod, thereby ensuring the stability of the relative position of the fixing member 2211.
[0047] In other embodiments, the fastener 2211 can be disposed on the surface film 216. By connecting with the surface film 216, the two fixing points 2213 of the fastener 2211 do not need to consider the connection stability of the fixing position. When the fastener 2211 is disposed on the surface film 216 of PET material, the two points can be connected by the direction of stitching. When the fastener 2211 is disposed on the surface film 216 of PTFE material, the fastener 2211 can be integrally formed on the surface film 216 during the molding process of the PTFE material surface film 216. The surface of the membrane 216, further, the PTFE material surface coating 216 typically includes an inner surface coating 216 and an outer surface coating 216. In this application, for the sake of long-term patency, the first branch 21 and the second branch 22 are coated with PTFE material surface coating 216. When the fastener 2211 is provided on the surface coating 216 of the second branch 22, it is provided by integrally molding it onto the outer surface coating 216. In this way, the inner cavity of the second branch 22 is not affected by the setting of the fastener 2211, thereby ensuring the long-term patency of the inner cavity.
[0048] In another embodiment, please refer to Figure 11 and Figure 12The fastener 2211 can also be set by means of a metal connecting rod. In this way, the fixing points 2213 at both ends of the metal connecting rod can be formed by weaving together the support frame 214 of the first branch 21 or the second branch 22. During the weaving process, the fastener 2211 is woven in the axial direction. Alternatively, the fixing points 2213 at both ends of the metal connecting rod can be connected to two support frames 214 with adjacent axes by welding to form the fixing points 2213. Alternatively, the fixing points 2213 at both ends of the metal connecting rod can be connected to the surface coating 216 by sewing or gluing. This allows the fastener 2211 to be formed at any position of the support frame 214, thus making the selection of the relative position of the movable connection more flexible. It can be set at the position of the far end 213 of the far end pipe section 212 of the first branch 21 on the surface of the second branch 22, which is closer to the far end 213 of the first branch 21. At the same time, the stability of the fastener 2211 after fixing can also be improved.
[0049] In this embodiment, the sliding member 2171 is partially sleeved onto the track 2212 of the fixing member 2211. The sliding member 2171 is at least partially fixed to a bracket different from the corresponding fixing member 2211. Similarly, the sliding member 2171 can be a polymer ring structure formed of polymer material. The polymer ring can be a rigid material or a soft material, and can be made of the same material as the stitching or coating of the first branch 21 or the second branch 22, such as PET material and PTFE material. The polymer ring can be fixed to the support frame 214 of the branch of the first branch 21 and the second branch 22 that does not have a fixing member 2211, or to the surface coating 216. When fixed to the support frame 214, it is fixed by stitching; when fixed to the surface coating 216, the polymer ring can be provided on the surface coating 216 by stitching, bonding, or integrally forming with the surface coating 216.
[0050] In one embodiment, see Figure 13 The sliding member 2171 can be positioned near the distal port 213 of the distal pipe section 212 of the first branch 21, while the fixed member 2211 is positioned opposite the movable member of the second branch 22. The sliding member 2171 can be fitted onto the fixed member 2211 and slide along the track 2212 provided by the fixed member 2211. Here, the direction and length of the fixed member 2211 can be set as the path and length that the sliding member 2171 travels when it swings close to the surface of the second branch 22. Specifically, to prevent the pipe body from bending and becoming blocked due to the free movement of the distal pipe section 212, the angle α formed by the line connecting the projections of the central axis of the distal pipe section 212 and the central axis of the second branch 22 in a plane parallel to both central axes can be set to be between 0° and 90°. That is to say, the angle at which the distal pipe section 212 can swing is between 0° and 90°.
[0051] In one embodiment, see Figure 14 and Figure 15 This application also provides a delivery system 10, which includes a film-coated support 100 provided in this application and a delivery handle 101 for delivering the film-coated support 100 provided in this application. The delivery handle 101 includes an operating part 1011, a sheath 1012, and a traction wire 1013. The traction wire 1013 passes through the operating part 1011 and the sheath 1012, and both ends of the traction wire 1013 exit from the distal end of the operating part 1011 and the proximal end of the sheath 1012, respectively. After exiting the sheath, the traction wire 1013... The proximal end of the sheath 1012 is detachably connected to the distal port 213 of the first branch 21. Here, the operating part 1011 is used to control the passage of the sheath 1012 through the human blood vessel and the release of the covered stent 100 in the human body. Furthermore, a traction wire 1013 is provided. The purpose of the traction wire 1013 is to be able to actively swing the distal port 213 of the first branch 21. So that when the position of the distal port 213 of the first branch 21 is deviated after the covered stent 100 is in place, the orientation of the distal port 213 can be adjusted by pulling the traction wire 1013.
[0052] Please refer to Figure 16 The traction wire 1013 can be connected to the first coil 2141 of the distal tube segment 212 of the first branch 21, which is closest to the distal port 213, and is connected by a detachable slip knot. After connection, the traction wire 1013 includes a slip knot portion 10130 connected to the first coil 2141, a traction portion 10131 pulled to the outside of the body, and a release portion 10132. The user can adjust the distal port 213 by pulling the traction portion 10131. After the adjustment is completed, the user can pull the release portion 10132 to release the slip knot portion 10130 from the first coil 2141, and then completely withdraw the traction wire 1013 from the outside of the body to complete the adjustment.
[0053] For details, please refer to Figures 16-20 The knotting method for the slip knot 10130 is as follows: Please refer to [link / reference]. Figure 17 Step 1: Bend the traction wire 1013 at the middle section so that both ends are outside the body. The middle section bend 10133 is located at the first wave loop 2141. First, wrap it around to the back of the first wave loop 2141, then refer to... Figure 18 Step 2, after the traction part 10131 forms a first U-shaped bend 10134 in front of the first wave ring 2141, it passes through the middle bend 10133 at the rear, as shown. Figure 19 As shown, in step 3, the pull-down release part 10132 secures the first U-shaped bend 10134 onto the first wave coil 2141; then refer to... Figure 20In step 4, the release part 10132 forms a second U-shaped bend 10135 in front of the first wave coil 2141. The second U-shaped bend 10135 passes through the first U-shaped bend 10134, tightening the traction part 10131, so that the first U-shaped bend 10134 locks the second U-shaped bend 10135, thereby forming a slipknot part 10130. The distal ends of the traction part 10131 and the release part 10132 are exposed from the distal end of the operation part 1011 of the conveying handle 101 and are used to pull the first wave coil 2141 and the release part, respectively.
[0054] 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 device includes a proximal body and a distal body. The distal body includes a first branch and a second branch arranged radially, with the proximal ends of the first branch and the second branch communicating with the proximal body. The first branch is bent at least partially toward the second branch and then fixedly connected to the outer wall of the second branch. After connection, the central axis of the first branch and the central axis of the second branch form an angle. The first branch includes a distal pipe segment away from the proximal body, and the distal end of the distal pipe segment includes a distal port. The distal pipe segment, including at least the portion with the distal port, is freely movable.
2. The covered stent according to claim 1, characterized in that, The first branch includes a proximal tube segment connected to the proximal body, and at least a portion of the outer wall of the proximal tube segment is connected to the outer wall of the second branch.
3. A covered stent according to claim 2, characterized in that, The first branch includes a support frame and a surface coating disposed on the surface of the support frame. The surface coating covers the inner and / or outer surfaces of the support frame. At least the support frame and / or the surface coating of the proximal tube segment are fixedly connected to the second branch.
4. A covered stent according to claim 3, characterized in that, The support frame includes multiple first wave coils, with adjacent first wave coils along the axial direction spaced apart or interlocked.
5. A covered stent according to claim 4, characterized in that, Multiple first wave coils are spaced apart in the proximal pipe section, and the first wave coils are spaced apart or interlocked in the distal pipe section.
6. A covered stent according to claim 3, characterized in that, The distal pipe section of the first branch near the outer wall of the second branch includes a first movable limiting member. The second branch is provided with a second movable limiting member at a position opposite to the first movable limiting member. One of the first movable limiting member and the second movable limiting member includes a fixing member, and the other includes a sliding member. The fixing member has a track extending along the length direction, and the sliding member can slide along the track.
7. A covered stent according to claim 6, characterized in that, The second branch includes a support frame and a surface coating on the surface of the support frame, and the fixing member or the sliding member is disposed on the support frame and / or the surface coating of the second branch.
8. A covered stent according to claim 7, characterized in that, The sliding member includes a polymer ring, which is sleeved on the fixing member. The polymer ring is formed on the surface coating or the support skeleton of the first branch and the second branch where the fixing member is not provided.
9. A covered stent according to claim 8, characterized in that, The fastener includes a polymer wire formed on the surface coating or the support frame, or the fastener includes a metal connecting rod with its two ends fixedly connected to the support frame.
10. A covered stent according to claim 8, characterized in that, The angle formed by the line connecting the projections of the central axis of the distal pipe section and the central axis of the second branch onto a plane parallel to both central axes is 0° to 90°.
11. A conveying system, characterized in that, The device includes a delivery handle and a film-coated support as described in any one of claims 1-10. The delivery handle includes an operating part, a sheath, and a traction wire. The traction wire passes through the operating part and the sheath, and both ends of the traction wire exit from the distal end of the operating part and the proximal end of the sheath, respectively. After exiting, the proximal end of the traction wire establishes a detachable connection with the distal port of the first branch.