Luminal stent

Abstract

The present invention discloses a luminal stent, comprising a tubular body and a semi-release device connected to the tubular body, wherein the semi-release device comprises a limit rod provided on the tubular body, a restraining wire, and a limit rod channel, wherein a portion of the limit rod is passed through the limit rod channel, and the restraining wire comprises a locking portion, wherein the locking portion is detachably connected to the limit rod, and the locking portion is separated from the limit rod by pulling the proximal end of the limit rod. When the limit rod is connected to the locking portion, the restraining wire circumferentially restrains the tubular body. The luminal stent can ensure the stability of its semi-release state, which is conducive to uniform restraint of the luminal stent, thereby achieving precise positioning.

Description

Technical Field

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

[0002] Over the past decade, endovascular exclusion with aortic stent grafts has been widely used for thoracic and abdominal aortic aneurysms and dissections. Its proven efficacy, minimal invasiveness, rapid recovery, and minimal complications have made it a first-line treatment. During the procedure, under X-ray fluoroscopy, the stent graft is delivered to the lesion via a delivery system. The stent graft isolates blood flow from the lesion, eliminating the effects of blood pressure on the lesion and ultimately achieving a cure.

[0003] To address the problem of positioning a stent graft within the body, imaging marks are typically placed at key locations on the stent graft, and these marks are used to position the stent graft axially and circumferentially. However, when the stent graft is compressed within the delivery sheath, it exhibits circumferential wrinkles and is axially elongated. Positioning using imaging marks at this point can result in significant circumferential and axial deviations. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a luminal stent in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A tubular cavity stent is provided, comprising a tubular body and a semi-release device connected to the tubular body, the semi-release device comprising a limit rod, a restraining line and a limit rod channel arranged on the tubular body, a portion of the limit rod being passed through the limit rod channel, the restraining line comprising a locking portion, the locking portion being detachably connected to the limit rod, and the locking portion is separated from the limit rod by pulling the proximal end of the limit rod, wherein, when the limit rod is connected to the locking portion, the restraining line circumferentially restrains the tubular body.

[0007] In summary, the embodiment of the present invention has the following beneficial effects: the present application can ensure that the shape of the limit rod remains stable (even in a curved blood vessel) by burying part of the limit rod in the limit rod channel, thereby ensuring the stability of the semi-released state of the lumen stent, which is beneficial to the uniform restraint of the lumen stent; the limit rod can be selected to be thinner in size to reduce the outline size of the lumen stent; at least part of the limit rod is set in the limit rod channel, which can reduce the stimulation of the blood vessel; the setting of the limit rod channel can avoid the force of the limit rod on the inner wall of the blood vessel when the limit rod is withdrawn, and can also avoid damaging the blood vessel. At the same time, the locking part of the binding line is detachably connected to the limit rod, so that the tubular body has a semi-released state, and the lumen stent is uniformly compressed in the circumferential direction, so that when the lumen stent is released from the delivery sheath into the blood vessel, it is still in an adjustable state that is not attached to the wall. After the lumen stent is adjusted and positioned accurately, the limit rod is withdrawn, the binding line is unlocked, and the lumen stent is evenly unfolded and attached to the wall.

[0008] In one embodiment, a side surface of the limiting rod channel has an opening, and the locking portion is detachably connected to the limiting rod at the opening.

[0009] In one embodiment, the limiting rod channel includes multiple channel sections, the limiting rod is sequentially inserted into the multiple channel sections, there is a gap between two adjacent channel sections, and the locking portion is detachably connected to the limiting rod in the gap.

[0010] In one embodiment, a wire body is provided on the surface of the tubular body, a pipeline structure is formed inside the wire body, the limiting rod channel includes the pipeline structure, a gap is provided in the wire body, and the locking portion is detachably connected to the limiting rod in the gap.

[0011] In one embodiment, the locking parts are respectively provided at both ends of the restraining line.

[0012] In one embodiment, the restraining wire further includes a fixing portion, and the fixing portion is used to fix the restraining wire to the tubular body.

[0013] In one embodiment, the fixing portion and the locking portion are respectively located at two ends of the restraining line.

[0014] In one embodiment, the fixing portion is located on the inner surface or outer surface of the limiting rod channel.

[0015] In one embodiment, the fixing portion is located on the tubular body at a position other than the limiting rod passage.

[0016] In one embodiment, the number of the limit rod channels is at least two, and the limit rod channels are spaced apart along the circumference of the tubular body. The limit rod channels are all provided with the limit rod, and at least one restraining line is provided between adjacent limit rod channels, wherein the middle part of at least one of the restraining lines includes a fixing part, and the fixing part is used to fix the restraining line to the tubular body, wherein each of the limit rods is detachably connected to at least one of the locking parts.

[0017] In one embodiment, the locking portion is provided at both ends of the restraining line.

[0018] In one embodiment, the limiting rod channel as a whole is at least one of a straight line, a curve or a broken line in a direction from the proximal end to the distal end on the tubular body.

[0019] In one embodiment, when the limiting rod is connected to the locking portion, the distal end of the restraining line is wrapped around the tubular body, and the proximal end of the restraining line extends outside the body.

[0020] In one embodiment, at least part of the limiting rod channel is composed of a film provided on the surface of the tubular body; or, the tubular body includes a bare stent and a stent coating, and at least part of the limiting rod channel is formed in the stent coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0022] Figure 1a is a schematic structural diagram of the endoluminal stent of the first embodiment in a semi-released state;

[0023] Figure 1b This is a schematic structural diagram of the endoluminal stent of the first embodiment in a fully released state;

[0024] Figure 2 This is a method for preparing a limit rod channel in an embodiment of the present invention;

[0025] Figure 3 This is another method for preparing the limit rod channel in the embodiment of the present invention;

[0026] Figure 4 This is another method for preparing the limit rod channel in the embodiment of the present invention;

[0027] Figure 5a is a schematic structural diagram of another implementation of the first embodiment of the endoluminal stent in a semi-released state;

[0028] Figure 5b yes Figure 5a Enlarged view of part A;

[0029] Figure 6a is a schematic structural diagram of the endoluminal stent of the second embodiment in a semi-released state;

[0030] Figure 6b is a schematic structural diagram of the endoluminal stent of the second embodiment in a fully released state;

[0031] Figure 7a is a schematic structural diagram of the endoluminal stent in a semi-released state according to the third embodiment;

[0032] Figure 7b is a schematic structural diagram of the endoluminal stent of the third embodiment in a fully released state;

[0033] Figure 8a is a schematic structural diagram of the endoluminal stent of the fourth embodiment in a semi-released state;

[0034] Figure 8b This is a schematic structural diagram of the endoluminal stent according to the fourth embodiment in a primary release state;

[0035] Figure 8c This is a schematic structural diagram of the endoluminal stent in the fourth embodiment in a secondary release state;

[0036] Figure 9a is a schematic structural diagram of the endoluminal stent of the fifth embodiment in a semi-released state;

[0037] Figure 9b is a schematic structural diagram of the endoluminal stent of the fifth embodiment in a fully released state;

[0038] Figure 10a is a schematic structural diagram of another implementation of the fifth embodiment of the endoluminal stent in a semi-released state;

[0039] Figure 10b yes Figure 10a Schematic diagram of the structure of the luminal stent in a fully released state;

[0040] Figure 11a is a schematic structural diagram of a luminal stent in a semi-released state according to another implementation manner of the fifth embodiment;

[0041] Figure 11b yes Figure 11a Schematic diagram of the structure of the luminal stent in a fully released state;

[0042] Figure 12a is a schematic structural diagram of the luminal stent in a semi-released state according to the sixth embodiment;

[0043] Figure 12b 3 is a schematic structural diagram of the luminal stent in the sixth embodiment in a fully released state. DETAILED DESCRIPTION

[0044] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

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

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] It should be noted that the end of the endoluminal stent close to the operator (or the end close to the conveyor handle) during the release process is defined as the proximal end, and the other end is defined as the distal end.

[0048] See Figure 1a and Figure 1b As shown, the first embodiment provides a luminal stent, comprising a tubular body 10 and a semi-releasing device 20 connected to the tubular body 10 and radially constraining the tubular body 10 .

[0049] The semi-release mechanism 20 comprises a limiting rod 21, a restraining wire 22, and a limiting rod passage 23, mounted on the tubular body 10. A portion of the limiting rod 21 extends through the limiting rod passage 23. The restraining wire 22 includes a locking portion 22a, which is detachably connected to the limiting rod 21. Pulling the proximal end of the limiting rod 21 separates the locking portion 22a from the limiting rod 21. When the limiting rod 21 is connected to the locking portion 22a, the restraining wire 22 circumferentially restrains the tubular body 10.

[0050] Burying part of the limiting rod 21 in the limiting rod channel 23 can ensure that the shape of the limiting rod 21 remains stable (even in a curved blood vessel), thereby ensuring the stability of the semi-released state of the luminal stent, which is beneficial to the uniform restraint of the luminal stent; compared with the situation where the limiting rod channel 23 is not set and the limiting rod 21 is directly set on the tubular body 10, the limiting rod 21 can be selected to be thinner in size to reduce the outline size of the luminal stent; at least part of the limiting rod 21 is set in the limiting rod channel 23, which can reduce irritation to the blood vessel; setting the limiting rod channel can avoid the force of the limiting rod on the inner wall of the blood vessel when the limiting rod is pulled out, which can also damage and irritate the blood vessel. At the same time, the locking portion 22a of the restraining wire 22 is detachably connected to the limiting rod 21, placing the tubular body 10 in a semi-released state, achieving uniform circumferential compression of the luminal stent. This allows the luminal stent to remain in an adjustable, non-adherent state when released from the delivery sheath into the blood vessel. Once the luminal stent is accurately adjusted and positioned, the limiting rod 21 is withdrawn, the restraining wire 22 is unlocked, and the luminal stent is uniformly deployed and adhered to the wall. In this embodiment, at least a portion of the limiting rod channel 23 is formed by a thin film disposed on the surface of the tubular body 10; alternatively, the tubular body 10 includes a bare stent and a stent covering, and at least a portion of the limiting rod channel 23 is formed in the stent covering.

[0051] Some specific implementations can be found in Figure 2 、 Figure 3 and Figure 4 .exist Figure 2 In the embodiment, the film 30 is sutured or glued to the surface of the tubular body 10 through the fixing points 301 and 302, and at least part of the limiting rod channel 23 is formed between the film 30 and the tubular body 10 for the limiting rod 21 to penetrate. Figure 3 In the embodiment, the tubular body 10 includes a bare stent (not shown) and a stent covering 101. It is understood that the stent covering 101 has a multi-layer structure, and the gaps in the multi-layer structure form a limiting rod channel 23 for the penetration of the limiting rod 21. Alternatively, Figure 4 In, with Figure 3 Similar, the difference is that the stent covering 101 can be a multi-layer structure or a single-layer structure. By separating part of the stent covering 101 and the bare stent, and then wrapping the separated part of the stent covering 101 around the limiting rod 21 and suturing or gluing it to form a fixed point 1011, a separate limiting rod channel 23 is formed that is completely isolated from the unseparated stent covering 101.

[0052] It can be understood that a portion of the limiting rod 21 is disposed in the limiting rod channel 23 , and another portion of the limiting rod 21 extends out of the limiting rod channel 23 and outward from the body, making it easier for the operator to control the limiting rod 21 .

[0053] Specifically, in Figure 1a and Figure 1bIn this embodiment, locking portions 22a are provided at each end of the restraining wire 22. The side of the limiting rod passage 23 has an opening 23a, at which the locking portions 22a are detachably connected to the limiting rod 21. The locking portions 22a at both ends of the restraining wire 22 simultaneously enter the limiting rod passage 23 through the same opening 23a or are directly placed at the same opening 23a. The limiting rod 21 then passes through the two locking portions 22a at the same opening.

[0054] In another embodiment, see Figure 5a and Figure 5b The side of the limiting rod channel 23 has two openings 23a. The locking portion 22a at one end of the restraining line 22 enters the limiting rod channel 23 from one opening 23a, and the locking portion 22a at the other end of the restraining line 22 enters the limiting rod channel 23 from the other opening 23a. The limiting rod 21 passes through the two locking portions 22a in sequence.

[0055] When the luminal stent is in a semi-released state, the restraining wire 22 wraps around the tubular body 10. The locking portions 22a at both ends are arranged at the limiting rod channel 23. The distal end of the limiting rod 21 passes through the proximal end of the limiting rod channel 23 and connects with the locking portions 22a, respectively, so that the restraining wire 22 circumferentially restrains the tubular body 10. At this time, the position of the luminal stent can be adjusted. After the position of the luminal stent is confirmed, the luminal stent can be further released. When the luminal stent is fully released, the limiting rod 21 is pulled proximally, and the limiting rod 21 is disconnected from the locking portion 22a. Then, the restraining wire 22 releases the circumferential restraint on the tubular body 10, and the tubular body 10 expands radially until the distal end of the limiting rod 21 passes through the proximal end of the limiting rod channel 23, achieving the release of the luminal stent.

[0056] It should be noted that in this embodiment, the tie wire 22 may not have a fixing portion, and the tie wire 22 and the tubular body 10 are not connected via the fixing portion. After the luminal stent is released, the tie wire 22 is separated from the tubular body 10. After the luminal stent is adhered to the vessel wall, the tie wire 22 can be pressed between the luminal stent and the vessel wall. In other embodiments, the tie wire 22 may also be provided with a fixing portion, which fixes the tie wire 22 to the tubular body 10. After the luminal stent is released, the tie wire 22 and the tubular body 10 remain connected. For details, please refer to the following embodiments.

[0057] In this embodiment, the number of the restraining lines 22 is 3, and the 3 restraining lines 22 can be arranged in parallel. The number of openings 23a of the limit rod channel 23 is 3, and the locking portions 22a at both ends of each restraining line 22 are arranged to overlap at the opening 23a of the limit rod channel 23. In other embodiments, the number of the restraining lines 22 can be 1 or more, and the multiple restraining lines 22 do not need to be arranged in parallel, for example, they can be arranged crosswise or at an angle. The number of openings 23a of the limit rod channel 23 can be 1 or more. The locking portions 22a at both ends of the same restraining line 22 do not need to overlap, as long as they are both arranged at the opening 23a of the limit rod channel 23 and can be connected to the limit rod 21.

[0058] In this embodiment, the binding line 22 is made of elastic or non-elastic material. The locking portion 22a of the binding line 22 is annular. In other embodiments, the locking portion 22a can also be a semicircular, hook-shaped or other irregular shape that can be fixed by the limiting rod 21.

[0059] See Figure 6a and Figure 6b As shown, Figure 6a and Figure 6b The endoluminal stent provided in the second embodiment is different from the first embodiment in that the restraining wire 22 in this embodiment has a fixing portion 22b. Specifically, the fixing portion 22b is used to fix the restraining wire 22 to the tubular body 10, wherein the fixing portion 22b and the locking portion 22a are respectively located at both ends of the restraining wire 22, and the fixing portion 22b is located on the inner surface or outer surface of the limiting rod channel 23, and the fixing portion 22b and the locking portion 22a are both located near the same opening 23a. It should be noted that the fixing portion 22b is located on the inner surface of the limiting rod channel 23 and can enter the limiting rod channel 23 through the opening 23a of the limiting rod channel 23 for fixing, or the fixing portion 22b can be directly set on the inner surface of the limiting rod channel 23 during the manufacturing process of the endoluminal stent.

[0060] In other embodiments, in addition to the fixing portion 22 b provided at the end of the restraining line 22 , a fixing portion can be provided at any position of the restraining line 22 , and the fixing portion 22 b at the end of the restraining line 22 can be arbitrarily provided on the limiting rod channel 23 .

[0061] When the luminal stent is in a semi-released state, the restraining wire 22 wraps around the tubular body 10. One end of the restraining wire 22 is fixedly connected to the tubular body 10 via a fixing portion 22b, and the locking portion 22a at the other end is disposed at the opening 23a of the limiting rod passage 23. The distal end of the limiting rod 21 passes through the proximal end of the limiting rod passage 23, passes through the opening 23a of the limiting rod passage 23, and connects with the locking portion 22a, so that the restraining wire 22 circumferentially restrains the tubular body 10. At this time, the position of the luminal stent can be adjusted. After the position of the luminal stent is confirmed, the luminal stent can be further released. When the luminal stent is fully released, the limiting rod 21 is pulled proximally, and the limiting rod 21 is released from the locking portion 22a. The restraining wire 22 then releases the circumferential restraint on the tubular body 10, and the tubular body 10 expands radially until the distal end of the limiting rod 21 passes through the proximal end of the limiting rod passage 23, thereby achieving the release of the luminal stent.

[0062] See Figure 7a and Figure 7b As shown, Figure 7a and Figure 7b The endoluminal stent provided in the third embodiment differs from the second embodiment in that the fixing portion 22b is located on the tubular body 10 outside the limiting rod passage 23, thereby forming an unconstrained area A circumferentially around the tubular body 10. This unconstrained area A is necessary when the endoluminal stent is provided with branches or windows P. Unconstrained area A is deployed first in the semi-released state, facilitating more precise positioning.

[0063] In this embodiment, the fixing portions 22b of the three restraining wires 22 are all located on the tubular body 10 at locations outside the limiting rod passage 23. In other embodiments, when there are multiple restraining wires 22, a non-restraining area A is set based on the location of the branches or windows P. Specifically, the fixing portion 22b of at least one restraining wire 22 is set at a location outside the limiting rod passage 23 on the tubular body 10, thereby forming the non-restraining area A.

[0064] When the luminal stent is in a semi-released state, the restraining line 22 is wound around the surface of the tubular body 10, and one end of the restraining line 22 is fixedly connected to the tubular body 10 through the fixing portion 22b, and the locking portion 22a at the other end is arranged at the opening 23a of the limiting rod channel 23. The distal end of the limiting rod 21 passes through the proximal end of the limiting rod channel 23, passes through the opening 23a of the limiting rod channel 23, and is connected to the locking portion 22a, so that the restraining line 22 circumferentially restrains the tubular body 10, while the non-restraint area A remains in a completely released state. At this time, the position of the luminal stent can be adjusted (for example, check whether the branch or window P in the non-restraint area A corresponds to the appropriate position). After the position of the luminal stent is confirmed, the luminal stent can be further released. When the luminal stent is fully released, the limiting rod 21 is pulled toward the proximal end, and the limiting rod 21 is released from the connection with the locking portion 22a, and then the restraining line 22 releases the circumferential restraint on the tubular body 10, and the tubular body 10 expands radially until the distal end of the limiting rod 21 passes through the proximal end of the limiting rod channel 23, thereby achieving the release of the luminal stent.

[0065] See Figure 8a 、 Figure 8b and Figure 8c As shown, Figure 8a 、 Figure 8b and Figure 8c The endoluminal stent provided in the fourth embodiment differs from the above-mentioned embodiments in that the number of limiting rod channels is at least two, and the limiting rod channels are spaced circumferentially along the tubular body 10. Each limiting rod channel is provided with a limiting rod, and at least one restraining wire is provided between adjacent limiting rod channels. At least one of the restraining wires includes a fixing portion in its middle portion for securing the restraining wire to the tubular body 10. Each limiting rod is detachably connected to at least one locking portion. The endoluminal stent of this embodiment can meet the need for step-by-step release of the tubular body 10, thereby improving the controllability of the release operation. This improves positioning accuracy when moving the tubular body 10 to the desired implantation location.

[0066] Specifically, in this embodiment, the limit rod channel includes a first limit rod channel 23 and a second limit rod channel 23', and the first limit rod channel 23 and the second limit rod channel 23' are circumferentially spaced apart along the tubular body 10. A first limit rod 21 is provided in the first limit rod channel 23, and a second limit rod 21' is provided in the second limit rod channel 23'. Multiple restraining lines are provided between the first limit rod channel 23 and the second limit rod channel 23', but on the same circumferential section of the tubular body 10, a first restraining line 22 and a second restraining line 22' are provided between the first limit rod channel 23 and the second limit rod channel 23'. Both ends of the first restraining line 22 are provided with a first locking part 22a, and both ends of the second restraining line 22' are provided with a second locking part 22a'. The two first locking parts 22a are respectively located on the first limiting rod channel 23 and the second limiting rod channel 23', and the two second locking parts 22a' are also respectively located on the first limiting rod channel 23 and the second limiting rod channel 23'. The first limiting rod channel 23 includes a first opening 23a, and the second limiting rod channel 23' includes a second opening 23a'. The two locking parts in the same limiting rod channel overlap in the opening in the same limiting rod channel.

[0067] In this embodiment, the middle portion of the first restraining line 22 further comprises a first fixing portion 22b, and / or the middle portion of the second restraining line 22 further comprises a second fixing portion 22b'. The provision of the first fixing portion 22b and / or the second fixing portion 22b' ensures that step-by-step release can be achieved.

[0068] In other embodiments, the number of limit rod channels can be 3 or more. In other embodiments, a locking portion is provided at one end of the restraining line, and a fixing portion is also provided at the other end. The fixing portion can be provided on the inner surface or outer surface of the limit rod channel, or can be provided at a position other than the limit rod channel. It can be understood that on the same circumferential cross-section of the tubular body 10, at least one restraining line is provided between adjacent limit rod channels. In order to ensure that the tubular body 10 is completely restrained, restraining lines can be provided on multiple circumferential cross-sections of the tubular body 10. From the overall perspective of the tubular body 10, as long as at least one circumference of the tubular body 10 can be restrained by the restraining line.

[0069] In the semi-released state of the endoluminal stent, the first and second ligatures 22 and 22' are wound around the surface of the tubular body 10. The two first locking portions 22a at the ends of the first ligature 22 are located at the first opening 23a and the second opening 23a', respectively. The two second locking portions 22a' at the ends of the second ligature 22' are also located at the first opening 23a and the second opening 23a', respectively. The distal end of the first limiting rod 21 passes through the proximal end of the first limiting rod channel 23, passes through the first opening 23a of the first limiting rod channel 23, and connects with the first and second locking portions 22a and 22a' located at the first opening 23a. The distal end of the second limiting rod 21' passes through the proximal end of the second limiting rod channel 23', passes through the second opening 23a' of the second limiting rod channel 23', and connects with the first and second locking portions 22a and 22a' located at the second opening 23a', thereby circumferentially constraining the tubular body 10 with the first and second ligatures 22 and 22'. At this point, the position of the endoluminal stent can be preliminarily adjusted.

[0070] During the first-stage release of the endoluminal stent, the first limiting rod 21 is pulled proximally, releasing the connection between the first locking portion 22a and the second locking portion 22a' located at the first opening 23a, thereby releasing the local circumferential restraint on the tubular body 10. The tubular body 10 then partially expands radially until the distal end of the first limiting rod 21 passes through the proximal end of the first limiting rod channel 23, achieving the first-stage release of the endoluminal stent. At this point, the presence of the first fixing portion 22b and the second fixing portion 22b' ensures that the area between the first fixing portion 22b and the first locking portion 22a located at the second opening 23a', as well as the area between the second fixing portion 22b and the second locking portion 22a' located at the second opening 23a', remain restrained.

[0071] When performing the secondary release of the luminal stent, the second limiting rod 21' is pulled toward the proximal end, and the second limiting rod 21' is released from the connection with the first locking portion 22a and the second locking portion 22a' located at the second opening 23a', thereby releasing the local circumferential restraint on the tubular body 10, and the tubular body 10 is fully radially expanded until the distal end of the second limiting rod 21' passes through the proximal end of the second limiting rod channel 23', thereby achieving the second-level release of the luminal stent.

[0072] In this embodiment, by sequentially releasing different limiting rods, the restrained position of the tubular body 10 can be released in stages, thereby improving the controllability of the release operation and the accuracy of the release positioning. Compared to the prior art, when releasing the restrained position of the tubular body 10 in stages, one of the at least two limiting rods can be released first, thereby partially freeing the restraint of the restraining wire on the tubular body 10, thereby making the size of the tubular body 10 closer to the size of the anchor in the blood vessel, thereby more accurately positioning the tubular body.

[0073] See Figure 9a and Figure 9b As shown, Figure 9a and Figure 9b The fifth embodiment of the endoluminal stent differs from the above-mentioned embodiments in that, in this embodiment, the limiting rod channel 23 extends spirally from the proximal end to the distal end of the tubular body 10. In this embodiment, the limiting rod channel 23 extends spirally, resulting in the limiting rod 21 also being arranged spirally within the limiting rod channel 23. This arrangement increases the travel distance of the limiting rod during release and reduces operational sensitivity. It is understood that the limiting rod channel 23 can be a continuous or discontinuous channel as a whole, and the limiting rod channel 23 can be at least one of a straight line, a curved line, or a broken line from the proximal end to the distal end of the tubular body 10. The spiral shape mentioned above is a type of curved shape. The limiting rod channel 23 can have two ends disposed at the proximal and distal ends of the tubular body 10, respectively, or one end of the limiting rod channel 23 can be disposed at the distal end of the tubular body 10 and the other end at the middle of the tubular body 10. The distal end of the limiting rod channel 23 can be closed or open. The portion of the limiting rod 21 on the tubular body 10 can be completely located in the limiting rod channel 23, thereby avoiding direct contact with the blood vessel and thus stimulating the blood vessel.

[0074] In another embodiment, see Figure 10a and Figure 10b The limiting rod channel 23 is a non-continuous channel. The limiting rod channel 23 includes multiple channel sections 231. The limiting rod 21 is sequentially arranged in the multiple channel sections 231. There is a gap 23b between two adjacent channel sections 231. The locking portion 22a is detachably connected to the limiting rod 21 in the gap 23b.

[0075] In yet another embodiment, see Figure 11a and Figure 11b The surface of the tubular body 10 is provided with a wire body 232, and a pipe structure 233 is formed inside the wire body 232. The limiting rod channel 23 includes the pipe structure 233. The wire body 232 has a gap 232a. The locking portion 22a is detachably connected to the limiting rod 21 in the gap 232a. It is understood that the wire body 232 can be one or more wires, and is provided on the surface of the tubular body 10 by sewing or gluing.

[0076] See Figure 12a and Figure 12b As shown, Figure 12a and Figure 12bThe sixth embodiment of the endoluminal stent differs from the preceding embodiments in that the restraining wire 22 in this embodiment can be withdrawn from the body. Specifically, when the limiting rod 21 is connected to the locking portion 22a, the proximal end of the restraining wire 22 extends outside the body, and the distal end of the restraining wire 22 is wrapped around the tubular body 10. At least one locking portion 22a is disposed at the intersection of the restraining wire 22 and the opening 23a of the limiting rod channel 23.

[0077] In this embodiment, the restraining wire 22 is spirally wound around the surface of the tubular body 10, and is provided with three locking portions 22a on the restraining wire 22. The three locking portions 22a are disposed in the same limiting rod channel 23. In other embodiments, the restraining wire 22 can be wound around the surface of the tubular body 10 in any shape, and the restraining wire 22 can be provided with the locking portions 22a according to its shape. The limiting rod channels 23 can also be provided in multiple numbers, and the multiple locking portions 22a can be disposed in different limiting rod channels 23.

[0078] When the luminal stent is in a semi-released state, the restraining wire 22 is wrapped around the surface of the tubular body 10, with the proximal end of the restraining wire 22 extending to the external delivery handle (not shown). The locking portion 22a on the restraining wire 22 is located at the opening 23a of the limiting rod channel 23. The distal end of the limiting rod 21 passes through the proximal end of the limiting rod channel 23, passes through the opening 23a of the limiting rod channel 23, and connects with the locking portion 22a, so that the restraining wire 22 circumferentially restrains the tubular body 10. After the position of the luminal stent is confirmed, the luminal stent is further released. When the luminal stent is fully released, the limiting rod 21 is pulled proximally, and the limiting rod 21 is disconnected from the locking portion 22a. The restraining wire 22 then releases the circumferential restraint on the tubular body 10, and the tubular body 10 expands radially until the distal end of the limiting rod 21 passes through the proximal end of the limiting rod channel 23. At the same time, the restraining wire 22 is pulled out of the body from the proximal end, thereby releasing the luminal stent.

[0079] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0080] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A luminal stent, comprising a tubular body and a semi-release device connected to the tubular body, characterized in that: The semi-release device includes a limit rod, a restraining line and a limit rod channel provided on the tubular body, the limit rod channel extending in a spiral shape from the proximal end to the distal end on the surface of the tubular body, part of the limit rod is passed through the limit rod channel, the restraining line includes a locking portion, the limit rod channel includes a side opening or a gap passing through the circumference of the limit rod channel, the locking portion is detachably connected to the limit rod through the opening or the gap, wherein, when the limit rod is connected to the locking portion, the proximal end of the restraining line extends outside the body, the distal end of the restraining line is wrapped around the tubular body, thereby circumferentially restraining the tubular body, pulling the proximal end of the limit rod separates the locking portion from the limit rod, and pulling the proximal end of the restraining line withdraws the restraining line outside the body.

2. The endoluminal stent according to claim 1, wherein: The limiting rod channel includes a plurality of channel sections, the limiting rod is sequentially arranged in the plurality of channel sections, there is a gap between two adjacent channel sections, and the locking portion is detachably connected to the limiting rod in the gap.

3. The endoluminal stent according to claim 1, wherein: A wire body is provided on the surface of the tubular body, a pipeline structure is formed inside the wire body, the limiting rod channel includes the pipeline structure, the wire body has the gap, and the locking part is detachably connected to the limiting rod in the gap.

4. The endoluminal stent according to claim 1, wherein: At least part of the limiting rod channel is composed of a film provided on the surface of the tubular body; or, the tubular body includes a bare stent and a stent coating, and at least part of the limiting rod channel is formed in the stent coating.

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