Stent delivery device and stent delivery system

Abstract

The present application relates to a kind of stent delivery device and stent delivery system.The stent delivery device includes inner tube, outer tube, limiting sleeve and release sleeve;Limiting sleeve, release sleeve are sleeved on the outside of inner tube, outer tube is sleeved on the outside of limiting sleeve, release sleeve, limiting sleeve is located at the distal end side of release sleeve;The distal end of release sleeve is provided with restraint wire, and the bare section of stent is restrained outside limiting sleeve by restraint wire, release sleeve can move towards the proximal end of outer tube under the action of external force until the bare section is released by restraint wire.The stent delivery device, when releasing the film section of stent in advance, the bare section is restrained outside limiting sleeve by restraint wire, so that itself cannot be self-inflating, and the stent cannot "front jump", so as to reduce the risk of blocking portal vein branch.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a stent delivery device and stent delivery system. Background Technology

[0002] Transjugular intrahepatic portosystemic shunt (TIPS) is a minimally invasive treatment technique that involves implanting a stent between the portal vein and the hepatic vein to create a portosystemic shunt, thereby reducing portal vein pressure. It is used to treat complications such as refractory ascites and esophageal variceal bleeding caused by portal hypertension.

[0003] During transjugular intrahepatic portosystemic shunt (TIPS), a pre-operative intrahepatic puncture via the jugular vein is required to establish an artificial channel. A TIPS covered stent is then delivered and deployed along this channel to the target location, thereby establishing a portosystemic shunt and reducing portal vein blood flow pressure. A TIPS covered stent typically consists of a bare segment and a covered segment. The bare segment, approximately 20 mm in length, is positioned within the portal vein to ensure unimpeded perfusion of blood to other branches. The covered segment, approximately 40 mm–80 mm in length, is positioned within the liver parenchyma to effectively prevent bile erosion. The insertion path of the TIPS covered stent system is as follows: first, it enters the inferior vena cava via the jugular vein, then enters the hepatic vein via the inferior vena cava, and is then exited through the hepatic vein puncture site and enters the portal vein after passing through the liver parenchyma. After the stent system reaches the designated position, the entire stent system is withdrawn until the gold contrast ring at the junction of the bare segment and the covered segment coincides with the portal vein puncture site. The operating system releases the covered segment of the stent into the liver. At this time, the bare stent segment is still bound to the post-release device. After the covered segment of the stent is completely released into the liver, the post-release device is operated to release the bare stent segment into the portal vein.

[0004] In existing stent delivery devices, a certain degree of "pre-jumping" inevitably occurs during stent deployment. After deployment, the stent will deviate from its intended position to some extent. TIPS covered stents typically have a bare segment of 20mm in length. During deployment, the bare segment is already released and "floats" in the portal vein, subjected to the impact of portal vein blood flow. At the same time, there is a significant difference in radial support force between the covered segment and the bare segment, and the covered segment is subjected to uneven compression force from the liver parenchyma during deployment. As a result, the stent is very prone to displacement. If the covered segment enters the portal vein, it will cause the risk of blocking portal vein branches. Summary of the Invention

[0005] Therefore, it is necessary to provide a stent delivery device and stent delivery system to address the technical problem that existing stent delivery devices cause TIP coated stents to easily exhibit a "forward jump" phenomenon.

[0006] A support delivery device includes: an inner tube, an outer tube, a limiting sleeve, and a release sleeve;

[0007] The limiting sleeve and the release sleeve are sleeved outside the inner tube, and the outer tube is sleeved outside the limiting sleeve and the release sleeve. The limiting sleeve is located on the distal side of the release sleeve.

[0008] The distal end of the release sleeve is provided with a binding wire, which is used to bind the bare segment of the stent to the outside of the limiting sleeve. The release sleeve can move towards the proximal end of the outer tube under the action of external force until the binding wire releases the binding of the bare segment.

[0009] In the aforementioned stent delivery device, during clinical stent implantation, the restraint wire can bind the bare segment of the stent to the outside of the limiting cannula, thereby restraining the bare segment. When the covered segment of the stent is released first, the bare segment cannot expand on its own, and the stent cannot "jump forward." This effectively avoids stent displacement caused by "jumping forward," thereby reducing the risk of occlusion of portal vein branches and ensuring accurate stent release.

[0010] In one embodiment, the limiting sleeve is provided with a through hole along its proximal to distal direction, and the outer wall of the limiting sleeve is provided with a limiting groove communicating with the through hole;

[0011] The binding wire can be threaded through the wire hole and can be pulled out of the wire hole under the action of external force.

[0012] In one embodiment, there are multiple wire-passing holes, limiting grooves, and binding wires, and they correspond one-to-one.

[0013] The through-hole and the limiting groove are evenly distributed along the circumference of the limiting sleeve, and the binding wire is evenly distributed along the circumference of the release sleeve.

[0014] In one embodiment, the through hole is a blind hole.

[0015] In one embodiment, the limiting groove communicates with the lumen of the limiting sleeve.

[0016] In one embodiment, one or more limiting grooves are provided axially.

[0017] In one embodiment, the outer wall of the limiting sleeve is provided with a plurality of limiting grooves, which are evenly spaced in the axial and circumferential directions.

[0018] In one embodiment, a reinforcing portion is formed at the proximal end of the limiting sleeve, and the outer wall of the reinforcing portion has a wear-inducing structure;

[0019] And / or, the outer wall of the release sleeve has a wear-inducing structure.

[0020] In one embodiment, the support conveying device further includes a tapered guide head detachably connected to the distal end of the outer tube, and the distal end of the inner tube is connected to the tapered guide head.

[0021] In one embodiment, the support delivery device further includes: a handle, an ejector head, and an elastic element;

[0022] The handle is connected to the proximal end of the outer tube, the ejector head and the elastic element are disposed inside the outer tube, the distal end of the ejector head is used to abut against the proximal end of the bracket, and the two ends of the elastic element are respectively connected to the handle and the ejector head;

[0023] The proximal end of the inner tube extends through the top head and connects to the handle.

[0024] In one embodiment, the distal end of the ejector head is provided with a bracket mounting boss, and / or the proximal end of the ejector head is provided with an elastic element mounting boss.

[0025] In one embodiment, the elastic mounting boss has a tube hole, and the proximal end of the inner tube extends through the tube hole and connects to the handle.

[0026] A support delivery system, characterized in that it includes a support and a support delivery device as described in any of the above claims;

[0027] The binding wire of the stent delivery device is used to bind the bare segment of the stent to the outside of the limiting sleeve of the stent delivery device. The release sleeve can move towards the proximal end of the outer tube under the action of external force until the binding wire releases the binding of the bare segment.

[0028] In the aforementioned stent delivery system, during clinical stent implantation, the restraint wire can bind the bare segment of the stent to the outside of the limiting cannula, thereby restraining the bare segment. When the covered segment of the stent is released first, the bare segment cannot expand on its own, and the stent cannot "jump forward." This effectively avoids stent displacement caused by "jumping forward," thereby reducing the risk of occlusion of portal vein branches and ensuring accurate stent release. Attached Figure Description

[0029] Figure 1 This is a partial structural schematic diagram of a support conveying system provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a limiting sleeve provided in an embodiment of the present invention;

[0031] Figure 3 forFigure 2 A cross-sectional view of the limiting sleeve is shown;

[0032] Figure 4 This is a schematic diagram of the structure of a limiting sleeve provided in another embodiment of the present invention;

[0033] Figure 5 for Figure 4 A cross-sectional view of the limiting sleeve is shown;

[0034] Figure 6 This is a schematic diagram of the structure of a release sleeve provided in an embodiment of the present invention;

[0035] Figure 7 This is a partial structural diagram of a bare segment provided in an embodiment of the present invention;

[0036] Figures 8 to 11 This is a schematic diagram of the implantation process of a stent delivery system according to an embodiment of the present invention;

[0037] Figure 12 This is a schematic diagram of the ejector head provided in an embodiment of the present invention.

[0038] The reference numerals in the accompanying drawings are explained as follows:

[0039] 10. Frame delivery device; 100. Inner tube; 200. Outer tube; 300. Limiting sleeve; 310. Through-wire hole; 320. Limiting groove; 330. Lumen; 340. Reinforcing part; 400. Release sleeve; 410. Binding wire; 420. Release wire; 500. Conical guide head; 600. Ejector head; 610. Support mounting boss; 620. Elastic element mounting boss; 630. Through hole; 700. Elastic element; 800. Support; 810. Bare segment; 811. Support segment; 812. Apex; 820. Covered segment; 830. Contrast ring; A1. Liver; A2. Inferior vena cava; A3. Right hepatic vein; A4. Puncture channel; A5. Portal vein. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] like Figure 1 As shown, an embodiment of the present invention provides a stent conveying device 10, which includes: an inner tube 100, an outer tube 200, a limiting sleeve 300, and a release sleeve 400; the limiting sleeve 300 and the release sleeve 400 are sleeved outside the inner tube 100, and the outer tube 200 is sleeved outside the limiting sleeve 300 and the release sleeve 400, with the limiting sleeve 300 located at the distal end of the release sleeve 400; as shown Figure 6 As shown, a binding wire 410 is provided at the distal end of the release sleeve 400. The binding wire 410 is used to bind the bare segment 810 of the support 800 to the outside of the limiting sleeve 300. The release sleeve 400 can move towards the proximal end of the outer tube 200 under the action of external force until the binding wire 410 releases the binding of the bare segment 810.

[0047] It should be noted that the distal end of each component of the stent delivery device refers to the end that first enters the patient's liver A1, while the proximal end of each component refers to the end closest to the operator.

[0048] This stent delivery device is used in the medical field to deliver medical stents to the lesion site of a patient. Medical stents can be intestinal stents, vascular stents, etc., with vascular stents including either bare segments or TIP (tissue inlay) covered stents that include both bare segments and covered segments. See also Figure 1 , Figure 1 The area circled by the dashed line is the TIP covered stent 800. The bare segment 810 is approximately 20 mm long and is fitted over the limiting cannula 300 to position it within the portal vein, ensuring that blood flow from the portal vein to other branches is not affected. The covered segment 820 is approximately 40 mm to 80 mm long and is fitted over the release cannula 400 to position it within the liver parenchyma, effectively preventing bile erosion. A contrast-enhancing ring 830, such as a gold contrast-enhancing ring, is located at the junction of the bare segment 810 and the covered segment 820. For details, see [link to details]. Figure 7The bare section 810 has a mesh structure, including multiple support sections 811 arranged sequentially along the axial direction, with the vertices 812 of adjacent support sections 811 interlocked. The support 800 of the coated section 820 includes multiple support sections arranged sequentially along the axial direction, with adjacent support sections spaced apart and connected by connecting rods. The following description will take the TIP coated support 800 as an example to illustrate the material, structure, and working process of the support conveying device 10.

[0049] As an example, the inner tube 100, outer tube 200, limiting sleeve 300, and release sleeve 400 of the stent delivery device are made of a biocompatible, safe, and relatively rigid plastic material, such as PE (Polyethene). This type of material allows the stent delivery device to bend accordingly with the blood vessel during implantation. Furthermore, the inner tube 100, outer tube 200, limiting sleeve 300, and release sleeve 400 can all be round tubes.

[0050] As an example, the binding wire 410 on the release sleeve 400 is made of a metal material with biocompatibility, safety and a certain degree of hardness, such as nickel-titanium.

[0051] The following is for reference. Figures 8 to 11 The working process of the support conveying device 10 is described as follows:

[0052] In application, the TIP-coated stent 800 is first assembled into the stent receiving cavity formed between the outer tube 200 and the inner tube 100 of the stent delivery device. Specifically, the TIP-coated stent 800 is first fitted over the inner tube 100, and the bare section 810 of the TIP-coated stent 800 is aligned with the limiting sleeve 300; then, the binding wire 410 of the release sleeve 400 binds the bare section 810 to the outside of the limiting sleeve 300; then, the outer tube 200 is fitted over the inner tube 100, at which point the limiting sleeve 300, the release sleeve 400, and the TIP-coated stent 800 are all assembled inside the outer tube 200. It should be noted that there are gaps between the walls of the limiting sleeve 300, the release sleeve 400, and the outer tube 200, and the width of these gaps is greater than or equal to the wall thickness of the TIP-coated stent 800 to accommodate the TIP-coated stent 800.

[0053] See Figure 8 During clinical implantation, the stent delivery device 10 enters the inferior vena cava A2 via the patient's jugular vein approach, is adjusted in direction and then enters the right hepatic vein A3, and is subsequently introduced into the portal vein A5 through a pre-established artificial channel.

[0054] See Figure 9 and Figure 10After the stent delivery device 10 enters the designated position in the portal vein A5, the entire stent delivery device 10 is withdrawn until the contrast ring 830 of the TIP covered stent 800 is completely aligned with the puncture site of the portal vein A5, at which point the withdrawal is stopped. Subsequently, the outer cannula 200 is withdrawn until the TIP covered stent 800 is completely released from the outer cannula 200. At this point, the covered segment 820 of the TIP covered stent 800 has been released into the puncture channel A4 of the liver A1, but the bare segment 810 of the TIP covered stent 800 is still bound to the outside of the limiting cannula 300 by the binding wire 410.

[0055] See Figure 11 Then, the release cannula 400 is pulled towards the proximal end of the outer cannula 200, and the restraint wire 410 is pulled back towards the proximal end along with the release cannula 400. The bare segment 810 is freed from the restraint wire 410 and is released into the portal vein A5. Finally, the stent delivery device is withdrawn from the human body.

[0056] In the aforementioned stent delivery device, during clinical implantation of the stent 800, the restraint wire 410 can restrain the bare segment 810 of the stent 800 to the outside of the limiting sleeve 300, thereby restraining the bare segment 810. When the covered segment 820 of the stent 800 is released first, the bare segment 810 itself cannot expand, and the stent 800 cannot "jump forward". This can effectively avoid the displacement of the stent 800 due to "jumping forward", thereby reducing the risk of blockage of the portal vein A5 branch and ensuring accurate release of the stent 800.

[0057] In some embodiments of the present invention, see Figures 2 to 5 The limiting sleeve 300 has a threaded hole 310 along its proximal to distal direction. The outer wall of the limiting sleeve 300 has a limiting groove 320 communicating with the threaded hole 310. A binding wire 410 can pass through the threaded hole 310 and can be pulled out of the threaded hole 310 under external force. The binding wire 410 can pass through the mesh of the threaded hole 310 and the bare section 810, thereby binding the bare section 810 in the limiting groove 320, thus serving to bind the bare section 810. In this way, the limiting groove 320 can accommodate a portion of the bare section 810 radially without increasing the diameter of the outer tube 100.

[0058] It should be noted that the outer wall of the limiting sleeve 300 refers to the side wall of the limiting sleeve 300 that is away from its own axis, and does not refer to the proximal end face and distal end face of the limiting sleeve 300.

[0059] In this embodiment, as Figures 2 to 5As shown, there are multiple through holes 310, limiting grooves 320, and binding wires 410, and they correspond one-to-one. The through holes 310 and limiting grooves 320 are evenly distributed along the circumference of the limiting sleeve 300, and the binding wires 410 are evenly distributed along the circumference of the release sleeve 400. In this way, each vertex 812 of each support segment 811 of the bare segment 810 can be effectively bound. The number of through holes 310, limiting grooves 320, and binding wires 410 can be the same as the number of vertices in each support segment 800. For example, if each support segment 811 has 6 vertices 812, then the number of through holes 310, limiting grooves 320, and binding wires 410 can all be 6; as another example, if each support segment 811 has 12 vertices 812, then the number of through holes 310, limiting grooves 320, and binding wires 410 can all be 12.

[0060] In this embodiment, as Figure 3 and Figure 5 As shown, the through hole 310 is a blind hole, meaning that the through hole 310 passes through the proximal end of the limiting sleeve 300 but not the distal end. Thus, after the binding wire 410 passes through the proximal end of the through hole 310 and the mesh of the bare segment 810, it can be confined within the proximal end of the through hole 310, effectively binding the bare segment 810.

[0061] In this embodiment, as Figure 2 and Figure 4 As shown, the limiting groove 320 communicates with the cavity 330 of the limiting sleeve 300. This arrangement ensures that the limiting groove 320 has sufficient space to limit the bare section 810, and also allows observation of whether the limiting sleeve 300 and the inner tube 100 are properly assembled. Optionally, the limiting sleeve 300 and the inner tube 100 can be integrally formed.

[0062] In this embodiment, as Figure 2 and Figure 4As shown, there are multiple limiting grooves 320, and these multiple limiting grooves 320 are evenly spaced in the axial and circumferential directions. Multiple limiting grooves 320 are spaced apart along the axial direction of the limiting sleeve 300, and the multiple discontinuous groove structures ensure the strength of the limiting sleeve 300. Of course, in some other embodiments, a single, continuous limiting groove 320 can also be continuously formed along the axial direction of the limiting sleeve 300. A single, continuous groove structure is easier to form, and the structure of the limiting groove 320 can be specifically set according to the actual situation during application. It should be noted that when multiple limiting grooves 320 are formed along the axial direction of the limiting sleeve 300, the spacing between two adjacent limiting grooves 320 needs to be set according to the spacing between two adjacent support segments 811 of the bare segment 810; otherwise, the support segment 811 of the bare segment 810 cannot be smoothly bound to the outer surface of the limiting sleeve 300. As an example, the limiting groove 320 can be distributed along the axial direction of the limiting sleeve 300, so that the binding wire 410 can limit the bare section 810 in the limiting groove 320 with less force.

[0063] In some embodiments of the present invention, such as Figure 6 As shown, a release wire 420 is provided at the proximal end of the release sleeve 400. The release wire 420 can pull the release sleeve 400 to move under the action of external force. After the TIP covered stent 800 is completely released from the outer tube 200, pulling the release wire 420 causes the binding wire 410 to retract proximally along with the release sleeve 400, and the bare segment 810 is released from the binding wire 410. The release wire 420 facilitates the release of the bare segment 810. The diameter of the release wire 420 can be smaller than that of the binding wire 410. Optionally, the release wire 420 is made of a metal material with biocompatibility, safety, and a certain degree of hardness, such as nickel-titanium or stainless steel. The number of release wires 420 can be specifically set according to the actual situation, such as 1, 2, or 3.

[0064] In some embodiments of the present invention, such as Figures 2 to 5 As shown, a reinforcing portion 340 is formed at the proximal end of the limiting sleeve 300, and the outer wall of the reinforcing portion 340 has a wear-increasing structure; and / or, the outer wall of the release sleeve 400 has a wear-increasing structure. The reinforcing portion 340 can increase the strength of the limiting sleeve 300; in addition, the wear-increasing structure on the reinforcing portion 340 and the release sleeve 400 can increase the friction between the outer surface of the reinforcing portion 340 and the release sleeve 400 and the inner surface of the coating section 820 when the coating section 820 of the TIP stent 800 is released, which can provide some resistance to the release of the TIP coated stent 800, effectively reducing the "forward jump" phenomenon when the TIP coated stent 800 is released, and ensuring the accurate release position of the TIP coated stent 800. It can be understood that the through hole 310 penetrates to the proximal end face of the reinforcing portion 340.

[0065] Optionally, the wear-increasing structure is a frosted structure. Of course, in some other embodiments, multiple protrusions can also be provided on the outer wall of the reinforcing part 340 and the release sleeve 400 to form a wear-increasing structure.

[0066] like Figure 1 As shown, the stent delivery device also includes a tapered guide head 500 detachably connected to the distal end of the outer tube 200, with the distal end of the inner tube 100 connected to the tapered guide head 500. The tapered guide head 500 can serve as a guide during the implantation of the stent delivery device. Optionally, the tapered guide head 500 is assembled to the distal end of the outer tube 200 by an interference fit, thus facilitating the retraction of the outer tube 200.

[0067] like Figure 1 As shown, the stent delivery device 10 also includes: a handle (not shown in the figure), an ejector head 600, and an elastic element 700; the handle is connected to the proximal end of the outer tube 200, the ejector head 600 and the elastic element 700 are disposed inside the outer tube 200, the distal end of the ejector head 600 is used to abut against the proximal end of the stent 800, and both ends of the elastic element 700 are connected to the handle and the ejector head 600 respectively; the proximal end of the inner tube 100 extends through the ejector head 600 and is connected to the handle. When the outer tube 200 is retracted, the proximal end of the covered segment 820 is obstructed by the distal end of the ejector head 600 and is "push" out of the outer tube 200. The process stops after the TIP covered stent 800 is completely released from the outer tube 200. At this time, the covered segment 820 has been released into the puncture channel A4 of the liver A1. As an example, the ejector head 600 is provided with a through hole 630 along its proximal to distal direction, the through hole 630 being used for the passage of the release wire 420. The through hole 630 may be distributed along the axial direction of the ejector head 600.

[0068] Optionally, the elastic element 700 can be a spring, primarily designed to facilitate the adaptation of the stent delivery device's tip to curved blood vessels. For example, Figure 12 As shown, the proximal end of the ejector head 600 is provided with a resilient mounting boss 620, and the distal end of the resilient element 700 can be fitted onto the resilient mounting boss 620. The resilient mounting boss 620 has a tube hole, through which the proximal end of the inner tube 100 passes and connects to the handle. The proximal end of the inner tube 100 passes through the resilient mounting boss 620, and then through the resilient element 700 to connect to the handle.

[0069] Optionally, the distal end of the ejector head 600 is provided with a bracket mounting boss 610. The proximal end of the coating section 820 of the TIP coating bracket 800 is fitted over the bracket mounting boss 610.

[0070] In other embodiments, a binding wire 410 is provided at the distal end of the release sleeve 400, and the outer diameter of the release sleeve 400 is larger than the outer diameter of the limiting sleeve 300, so that the binding wire 410 can bind the bare segment of the stent to the outside of the limiting sleeve.

[0071] Another embodiment of the present invention provides a stent delivery system, which includes a stent 800 and a stent delivery device 10 as described above; the binding wire 410 of the stent delivery device 10 is used to bind the bare segment 810 of the stent 800 to the outside of the limiting sleeve 300 of the stent delivery device 10, and the release sleeve 400 can move towards the proximal end of the outer tube 200 under the action of external force until the binding wire 410 releases the binding of the bare segment 810.

[0072] As an example, the stent can be a medical stent such as an intestinal stent or a vascular stent. The vascular stent can be a stent consisting only of a bare segment, or a TIP-covered stent comprising both a bare segment and a covered segment. See also Figure 1 , Figure 1 The area circled by the dashed line is the TIP covered stent 800. The bare segment 810 is approximately 20 mm long and is fitted over the limiting cannula 300 to position it within the portal vein, ensuring that blood flow from the portal vein to other branches is not affected. The covered segment 820 is approximately 40 mm to 80 mm long and is fitted over the release cannula 400 to position it within the liver parenchyma, effectively preventing bile erosion. A contrast-enhancing ring 830, such as a gold contrast-enhancing ring, is located at the junction of the bare segment 810 and the covered segment 820. For details, see [link to details]. Figure 7 The bare section 810 has a mesh structure, including multiple support sections 811 distributed sequentially along the axial direction, and the vertices 812 of two adjacent support sections 811 are interlocked; the support 800 of the coated section 820 includes multiple support sections distributed sequentially along the axial direction, and two adjacent support sections are spaced apart and connected by connecting rods.

[0073] In the aforementioned stent 800 delivery system, during clinical implantation of the stent 800, the restraint wire 410 can restrain the bare segment 810 of the membrane stent 800 to the outside of the limiting cannula 300, thereby restraining the bare segment 810. When the covered segment 820 of the stent 800 is released first, the bare segment 810 cannot expand on its own, and the stent 800 cannot "jump forward". This can effectively avoid the displacement of the stent 800 due to "jumping forward", thereby reducing the risk of blockage of the portal vein A5 branch and ensuring accurate release of the stent 800.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A support conveying device, characterized in that, include: Inner tube (100), outer tube (200), limiting sleeve (300) and release sleeve (400); The limiting sleeve (300) and the release sleeve (400) are sleeved outside the inner tube (100), and the outer tube (200) is sleeved outside the limiting sleeve (300) and the release sleeve (400). The limiting sleeve (300) is located on the distal side of the release sleeve (400). The distal end of the release sleeve (400) is provided with a binding wire (410), which is used to bind the bare segment (810) of the stent (800) to the outside of the limiting sleeve (300). The release sleeve (400) can move towards the proximal end of the outer tube (200) under the action of external force until the binding wire (410) releases the binding of the bare segment (810). The limiting sleeve (300) is provided with a through hole (310) along its proximal to distal direction. The outer side wall of the limiting sleeve (300) is provided with a plurality of limiting grooves (320) that communicate with the through hole (310) at intervals along the circumferential direction. The binding wire (410) can pass through the through hole (310) and the mesh of the bare segment (810) to bind the bare segment (810) in the limiting groove (320). The binding wire (410) can be pulled out from the through hole (310) under the action of external force. The through hole (310), the limiting groove (320) and the binding wire (410) correspond one-to-one.

2. The support conveying device according to claim 1, characterized in that, The wire passage hole (310) and the limiting groove (320) are evenly distributed along the circumference of the limiting sleeve (300), and the binding wire (410) is evenly distributed along the circumference of the release sleeve (400).

3. The support conveying device according to claim 1, characterized in that, The wire-passing hole (310) is a blind hole.

4. The support conveying device according to claim 1, characterized in that, The limiting groove (320) communicates with the cavity (330) of the limiting sleeve (300).

5. The support conveying device according to claim 1, characterized in that, The plurality of the limiting grooves (320) are evenly spaced in the axial and circumferential directions.

6. The support conveying device according to claim 1, characterized in that, The release sleeve (400) is provided with a release wire (420) at its proximal end, which can pull the release sleeve (400) to move under the action of external force.

7. The support conveying device according to claim 1, characterized in that, The proximal end of the limiting sleeve (300) is formed with a reinforcing part (340), and the outer wall of the reinforcing part (340) is a wear-inducing structure; And / or, the outer wall of the release sleeve (400) is a wear-inducing structure.

8. The support conveying device according to any one of claims 1-7, wherein the support conveying device (10) further comprises a tapered guide (500) detachably connected to the distal end of the outer tube (200), and the distal end of the inner tube (100) is connected to the tapered guide (500).

9. The support conveying device according to any one of claims 1-7, wherein the support conveying device (10) further comprises: Handle, ejector (600), and elastic element (700); The handle is connected to the proximal end of the outer tube (200), the ejector head (600) and the elastic element (700) are disposed inside the outer tube (200), the distal end of the ejector head (600) is used to abut against the proximal end of the bracket (800), and the two ends of the elastic element (700) are respectively connected to the handle and the ejector head (600); The proximal end of the inner tube (100) extends through the top head (600) and connects to the handle.

10. The support conveying device according to claim 9, characterized in that, The distal end of the ejector head (600) is provided with a bracket mounting boss (610), and / or the proximal end of the ejector head (600) is provided with an elastic element mounting boss (620).

11. The support conveying device according to claim 10, characterized in that, The elastic mounting boss (620) has a tube hole, and the proximal end of the inner tube (100) passes through the tube hole and connects to the handle.

12. A support conveying system, characterized in that, Includes a support (800) and a feeding device (10) for feeding the support as claimed in any one of claims 1-11; The binding wire (410) of the stent delivery device (10) is used to bind the bare segment (810) of the stent (800) to the outside of the limiting sleeve (300) of the stent delivery device (10). The release sleeve (400) can move towards the proximal end of the outer tube (200) under the action of external force until the binding wire (410) releases the binding of the bare segment (810).

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