Lumen stent

Abstract

The application discloses a lumen stent, which comprises a tubular body and a semi-releasing device connected to the tubular body, wherein the semi-releasing device comprises a limiting rod and a binding line, two locking portions are arranged on the binding line, the two locking portions are detachably connected with the limiting rod, and the binding line circumferentially restricts the tubular body when the two locking portions are connected with the limiting rod. The application has the beneficial effects that the binding line is used to uniformly compress the circumference of the lumen stent, the lumen stent can be in a semi-releasing state, the lumen stent can be adjusted and positioned, and the accuracy of the axial and circumferential positioning of the lumen stent is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of interventional medical devices, and particularly to a lumen stent. BACKGROUND

[0002] In the past decade, aortic covered stent endovascular exclusion has been widely used in thoracic and abdominal aortic aneurysm and arterial dissection, and its curative effect is accurate, with small trauma, fast recovery and few complications, and it has become a first-line treatment method. During the operation, under the monitoring of X-ray fluoroscopy, a covered stent is sent to the lesion site through a corresponding delivery system, the covered stent isolates the blood flow from the lesion site, and eliminates the influence of blood pressure on the lesion site, so as to achieve the purpose of cure.

[0003] In order to solve the positioning problem of the covered stent in the body, a visible marker is usually made at a key position of the stent, and the axial and circumferential positions of the covered stent are positioned by using the visible marker. However, when the covered stent is compressed in the delivery sheath tube, the circumferential direction has compression wrinkles, and the axial direction is in an elongated state. If the visible marker is used for positioning at this time, there will be a large deviation in the circumferential and axial directions. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a lumen stent to solve the above-mentioned defects of the prior art.

[0005] The technical scheme adopted by the present application to solve the technical problem is:

[0006] The present application provides a lumen stent, which comprises a tubular body and a semi-release device connected to the tubular body, the semi-release device comprises a limiting rod and a binding line, two locking portions are provided on the binding line, the two locking portions are detachably connected with the limiting rod, and when the two locking portions are connected with the limiting rod, the binding line circumferentially constrains the tubular body.

[0007] In the lumen stent, the semi-release device comprises a traction member connected with the binding line, when the limiting rod is separated from the locking portion to release the circumferential constraint of the binding line on the tubular body, the traction member is controlled to move towards the distal end relative to the tubular body, and the traction member can pull the binding line away from the tubular body.

[0008] In the lumen stent, the traction member is connected with the middle part of the binding line.

[0009] In the lumen stent, the traction member is movably connected with the limiting rod, and when the proximal end of the limiting rod is separated from the most distal locking portion on the tubular body, the limiting rod can drive the traction member to separate the binding line from the tubular body under the driving of the traction member.

[0010] In the tubular cavity stent, the traction member is movably connected with the limiting rod through a connecting member, the connecting member is provided with a constraint part, the limiting rod is movably arranged in the constraint part, and the limiting rod is provided with a protrusion.

[0011] In the tubular cavity stent, when all the restraint lines constrain the tubular body in the circumferential direction, the axial distance between the proximal end of the limiting rod and the locking part closest to the distal end on the tubular body is L1, and the distance between the protrusion and the constraint part is L2, wherein L1 < L2.

[0012] In the tubular cavity stent, the traction member is integrally formed with the connecting member.

[0013] In the tubular cavity stent, the tubular body is provided with a restraint channel, the corresponding central angle of the restraint channel is less than 360°, and at least one opening is formed, the opening is connected with the inner cavity of the restraint channel, the restraint line is arranged in the restraint channel, and the two locking parts are arranged to pass through the circumferential sides of the opening and be connected with the limiting rod.

[0014] In the tubular cavity stent, the tubular cavity stent comprises a covering film capable of isolating blood flow, and the outer surface of the covering film is provided with a cover.

[0015] In the tubular cavity stent, the tubular body is provided with a plurality of limiting ring buckles, the restraint channel is formed by the plurality of limiting ring buckles, and the restraint line is arranged in the limiting ring buckle.

[0016] In the tubular cavity stent, the tubular body comprises a plurality of wave-shaped rings, and the wave-shaped ring comprises a plurality of wave crests, a plurality of wave troughs and a plurality of connecting rods respectively connecting adjacent wave crests and wave troughs.

[0017] In the natural state, the straight-line distance between adjacent limiting ring buckles is m, the vertical distance between the fixed point of the limiting ring buckle and the wave trough located below the limiting ring buckle and closest to the limiting ring buckle is n, and m and n satisfy m≤2n.

[0018] In summary, the tubular cavity stent of the present application has the following advantages: the half-release device provided on the tubular cavity stent can improve the accuracy of axial and circumferential positioning of the tubular cavity stent. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of a lumen stent in a semi-released state according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Enlarged view of part A of the lumen support shown;

[0022] Figure 3 yes Figure 1 Top view of the lumen support shown;

[0023] Figure 4 yes Figure 3 Enlarged view of part B of the lumen support shown;

[0024] Figure 5 yes Figure 1 The diagram shows the lumen support when it is fully deployed.

[0025] Figure 6 This is a schematic diagram of a lumen stent whose restraint channel consists of multiple limiting rings;

[0026] Figure 7 yes Figure 6 The diagram shows the lumen support when it is fully deployed.

[0027] Figure 8 This is a schematic diagram of the limiting ring of a lumen stent according to one embodiment;

[0028] Figure 9 yes Figure 7 A schematic diagram showing the binding line of the lumen stent crossing the trough.

[0029] Figure 10 This is a schematic diagram of a lumen stent in one embodiment when the binding line has not crossed the trough.

[0030] Figure 11 This is a schematic diagram of a lumen stent in a semi-released state according to another embodiment of the present invention;

[0031] Figure 12 yes Figure 11 The diagram shows the lumen support when it is fully deployed.

[0032] Figure 13 yes Figure 12 The diagram shows the traction device pulling the restraint line away from the tubular body when the lumen support is fully deployed.

[0033] Figure 14 This is a schematic diagram of the lumen stent in a semi-released state according to another embodiment of the present invention;

[0034] Figure 15 is Figure 14 is an enlarged view of part C of the luminal stent shown in

[0035] Figure 16 is Figure 14 is a schematic view of the luminal stent shown in

[0036] Figure 17 is Figure 16 is an enlarged view of part D of the luminal stent shown in

[0037] Figure 18 is Figure 16 is a schematic view of the luminal stent shown in

[0038] Figure 19 is a schematic view of the luminal stent in a half-released state according to another embodiment of the present application.

[0039] Figure 20 is Figure 19 is a schematic view of the luminal stent shown in

[0040] Figure 21 is Figure 20 is a schematic view of the luminal stent shown in DETAILED DESCRIPTION

[0041] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. The techniques employed herein are generally known in the art.

[0042] It should be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and similar expressions as used herein are for illustrative purposes only and are not meant to be limiting.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] In the field of interventional medicine, the proximal end of a luminal stent is usually defined as the end closer to the heart after release, and the distal end is the end farther from the heart.

[0045] Please refer to Figure 1 , the luminal stent 100 provided by the embodiments of the present application comprises a tubular body 11 and a semi-release device 20 connected to the tubular body 11 and circumferentially constraining the tubular body 11. The semi-release device 20 comprises a limiting rod 21 and a binding line 22, please refer to Figure 2 、 Figure 3 and Figure 4 The binding line 22 is provided with two locking portions 221 which are detachably connected with the limiting rod 21. When the limiting rod 21 is connected with the locking portions 221, the binding line 22 circumferentially constrains the tubular body 11. Please refer to Figure 5 When the limiting rod 21 is separated from the locking portions 221, the limiting rod 21 releases the constraint of the locking portions 221, and then the binding line 22 releases the circumferential constraint of the tubular body 11, so that the tubular body 11 can be fully expanded.

[0046] The embodiments of the present application provide the semi-release device 20 on the luminal stent 100. After the luminal stent 100 is released from the delivery sheath, the luminal stent 100 is in a semi-release state under the constraint of the semi-release device 20. At this time, the luminal stent 100 is not in close contact with the blood vessel wall, and the operator can still adjust the axial and circumferential positions of the luminal stent 100. After accurate positioning, the constraint of the semi-release device 20 is released, so that the luminal stent 100 is expanded and in close contact with the blood vessel wall.

[0047] In combination with Figure 6 and Figure 7 It is shown that the outer surface of the tubular body 11 is provided with a plurality of limiting ring buckles 103 which are arranged along the circumference of the tubular body 11 to form a binding channel. The binding line 22 is arranged through the plurality of limiting ring buckles 103, and the binding channel is used to limit the axial position of the binding line 22 along the tubular body 11, so as to improve the stability of the circumferential constraint of the binding line 22 on the tubular body 11, and make the overall positioning of the luminal stent 100 more accurate. Moreover, when the luminal stent 100 is compressed in the delivery sheath or the constraint of the binding line 22 on the luminal stent 100 is released, the binding channel can also avoid the axial displacement of the binding line 22.

[0048] It should be noted that the structure of the lumen stent 100 forming the tubular body 11 can be varied, as long as the lumen stent 100 forms a hollow lumen structure so that the lumen of the lumen stent 100 can be used to form a channel for blood flow.

[0049] In some embodiments, the tubular body 11 includes multiple wavy annular sections 101 (e.g., Figure 9 As shown, each wave-shaped ring 101 includes multiple peaks, multiple troughs, and multiple connecting rods that connect adjacent peaks and troughs. The multiple wave-shaped rings 101 are arranged sequentially from the near end to the far end, preferably in parallel intervals. The wave-shaped ring 101 is a closed cylindrical structure. The multiple wave-shaped rings 101 can have the same or similar waveform shapes. It is understood that this embodiment does not limit the specific structure of the wave-shaped ring 101; the waveform of the wave-shaped ring 101 can be set as needed, and the number of waveforms and the waveform height in each wave-shaped ring 101 can also be set as required.

[0050] A membrane 102 is attached to the multi-ringed wavy ring 101 to isolate blood flow. The multi-ringed wavy ring 101 is made of a biocompatible material, such as nickel-titanium or stainless steel. The membrane 102 is made of a biocompatible polymer material, such as PTFE, FEP, or PET.

[0051] The size of the limiting ring 103 is 100% to 200% of the cross-sectional area of ​​the binding line 22. If the size of the limiting ring 103 is too large, the axial movement range of the binding line 22 will be large, which will affect the radial compression effect of the support. If the size of the limiting ring 103 is too small, it will increase the friction between the limiting ring 103 and the binding line 22, which will affect the relative movement of the binding line 22 and the limiting ring 103 along the circumference of the tubular body 11, which is not conducive to the smooth deployment of the lumen support 100.

[0052] Please see Figure 8 and Figure 9 If the distance between the two limiting rings 103 is too long, when the lumen support 100 is in a fully radially compressed state inside the sheath, the binding line 22 will be loose. The binding line 22 between the two limiting rings 103 will shift axially, and may even cross the trough of the corrugated annulus 101 and hook onto it. When the lumen support 100 is completely released from the delivery sheath, the binding line 22 hooking onto the corrugated annulus 101 will prevent the lumen support 100 from deploying normally.

[0053] Please see Figure 8 and Figure 10In its natural state (i.e., when the lumen stent 100 is fully released), the circumferential distance between two adjacent limiting rings 103 is m, and the vertical distance between the fixing point of the limiting ring 103 and the nearest trough located below the limiting ring 103 is n, where m and n satisfy m≤2n. When the lumen stent 100 is compressed in the delivery sheath, the binding line 22 can be prevented from crossing the trough of the wave-shaped annulus 101, thereby preventing the binding line 22 from hooking onto the trough and causing the lumen stent to fail to deploy.

[0054] Preferably, the limiting ring 103 is located in the middle of the connecting rod of the corrugated ring 101, which not only helps the binding line 22 to radially compress the lumen support 100 and make the corrugated ring 101 bear force evenly, but also reduces the risk of damage to the membrane 102 by the binding line 22.

[0055] Preferably, the wavy annular material 101 is located on the inner surface of the membrane 102, making the outer surface of the lumen support 100 smoother and facilitating the adjustment of the position of the lumen support 100.

[0056] It is understandable that if the circumscribed circle diameter of the lumen support 100 is too large when it is in a semi-released state, the lumen support 100 is prone to sticking to the wall, which is not conducive to its axial and circumferential adjustment; if the circumscribed circle diameter of the lumen support 100 is too small when it is in a semi-released state, the semi-release effect is not significant, and there is still a large circumferential and axial positioning deviation. Therefore, in this embodiment, the ratio of the circumscribed circle diameter of the lumen support 100 when it is in a semi-released state to the circumscribed circle diameter of the lumen support 100 when it is unfolded is 0.6 to 0.8.

[0057] In this embodiment, as Figure 1 As shown, there are multiple binding lines 22, which are spaced apart along the axial direction. Correspondingly, when the binding lines 22 are positioned along the axial direction of the tubular body 11 using binding channels, there are also multiple binding channels formed by multiple limiting rings 103, which are spaced apart along the axial direction of the tubular body 11 on the outer surface of the tubular body 11.

[0058] Although the binding channel in this embodiment is composed of multiple limiting rings 103, this embodiment does not limit the specific formation of the binding channel. The binding channel can be disposed on the inner surface of the tubular body 11 or on the outer surface of the tubular body. For example, in some other embodiments, multiple binding channels are distributed at intervals along the axial direction of the tubular body 11 on the inner surface of the tubular body 11.

[0059] It should be noted that when the binding channel is arranged on the outer surface of the tubular body 11, the binding force of the binding line 22 acts on the tubular body 11, so that the binding channel can be protected and the binding line 22 can be prevented from damaging the binding channel. When the binding channel is arranged on the inner surface of the tubular body 11, if the tubular stent 100 is completely released, the tubular body 11 and the blood vessel wall can be prevented from extruding the binding line 22 together, which is beneficial to withdrawing the binding line 22 out of the body.

[0060] Each binding channel is annular to be arranged around the circumference of the tubular body 11. By limiting the corresponding binding line 22 through each binding channel, the binding lines 22 can uniformly compress the tubular body 11. The binding line 22 can be a flexible line with strong tensile resistance, such as a polyester suture.

[0061] The binding line 22 can be composed of a single flexible line or multiple flexible lines.

[0062] The binding line 22 can be a flexible line with strong tensile resistance, such as a PTFE line or a polyester suture.

[0063] The limiting rod 21 can be a metal guide wire with good elastic memory and small surface roughness, for example, a nickel-titanium wire, which meets the physical requirements and has good biocompatibility with the human body. The diameter of the limiting rod 21 can be selected to be 0.2 mm to 0.6 mm, so that the diameter of the limiting rod 21 is appropriate. Avoiding that the diameter of the limiting rod 21 is too large to increase the profile (i.e., the area) of the tubular stent 100 as a whole, and the diameter of the limiting rod 21 is too large, which is insufficient in supporting force and affects the constraint effect on the locking portion 221.

[0064] In some embodiments, the surface roughness of the limiting rod 21 is less than or equal to 0.2 μm, so that the limiting rod 21 is smoothly extracted from the locking portion 221, thereby releasing the constraint on the locking portion 221.

[0065] The locking portion 221 is preferably a ring buckle structure or a half-ring structure formed by folding a single binding line 22.

[0066] In some embodiments, the proximal end 21a of the limiting rod 21 is provided with a guide head (not shown in the figure), which is used to guide the limiting rod 21 to pass through the locking portion 221, and to reduce the damage of the limiting rod 21 to the blood vessel by using the guide head.

[0067] In some embodiments, the guide head is a soft head arranged at the proximal end 21a of the limiting rod 21; thus, the soft head can avoid damaging the blood vessel with the proximal end 21a of the limiting rod 21. Specifically, the length of the soft head is set to 10mm-20mm, which can maintain the constraint of the limiting rod 21 on the locking portion 221 while avoiding damaging the blood vessel. If the soft head is too long, part of the soft head will be in the constraint position of the limiting rod 21 on the binding line 22, which may cause the locking portion 221 to be released from the limiting rod 21 due to insufficient support of the soft head. If the soft head is too short, the soft head will lack flexibility and easily damage the blood vessel.

[0068] In other embodiments, the guide head is a ball head formed at the proximal end 21a of the limiting rod 21. For example, when the limiting rod 21 is made of a metal guide wire, a ball head can be formed at the proximal end 21a of the limiting rod 21 by spot welding.

[0069] The diameter of the ball head can be and is 100%-150% of the diameter of the limiting rod 21. The guide wire with poor elastic memory is prone to bending after being stressed, which will increase the resistance when the guide wire is pulled out. The diameter of the ball head is 0.3mm-0.6mm

[0070] The diameter of the guide wire should not be too large or too small. If it is too large, it will increase the overall profile (silhouette) of the stent, and if it is too small, the support force will be insufficient to constrain the two ends of the long line buckle. If the diameter of the ball head at the proximal end of the guide wire is less than 0.3mm, it will easily damage the blood vessel, and if the diameter is greater than 150% of the diameter of the guide wire, it will cause the ball head position near the guide wire to be buckled between the long line buckle, which cannot be easily released.

[0071] Those skilled in the art should know that the tubular stent 100 of the present embodiment is only used as an example and does not limit the present application. The implant of the present application can be any covered tubular stent 100 with a bare stent, including but not limited to a thoracic aortic stent, an abdominal aortic stent, a thoracoabdominal aortic stent, etc.

[0072] Please refer to Figure 11 , Figure 12 and Figure 13 In some embodiments, the half-release device 20 further comprises a traction member 23. The traction member 23 has a connecting portion 231 connected with the binding line 22. The connecting portion 231 can be fixedly connected with the binding line 22, or can be sleeved or hung on the binding line 22. As long as the traction member 23 moves distally, it can pull the binding line 22 and withdraw the binding line 22.

[0073] For example, the connecting portion 231 is fixedly connected with the binding line 22 by means of glue bonding, or the connecting portion 231 is formed of a flexible wire, which can be connected with the binding line 22 by knotting or sleeving.

[0074] For another example, when the traction member 23 is a rod-shaped structural member, the connecting portion 231 can be a hook or a through hole, so that when the restraint line 22 is located in the connecting portion 231, the traction member 23 can pull the restraint line 22 out of the plurality of limiting ring buckles 103, and the restraint line 22 can be withdrawn out of the body.

[0075] In combination Figure 12 And Figure 13 As shown in FIGS. 1, 2, and 3, when the limiting rod 21 is separated from the locking portion 221 and the restraint of the locking portion 221 is released, the tubular body 11 is fully unfolded because it is no longer circumferentially constrained by the restraint line 22. At this time, by operating the traction member 23 to move distally, the traction member 23 can pull the restraint line 22 away from the tubular body 11, so that the restraint line 22 can be withdrawn out of the body, avoiding the risk that the restraint line 22 may fall into the blood in the body.

[0076] The connecting portion 231 of the traction member 23 can be connected to the middle portion of the restraint line 22, which can be understood as the midpoint position of the restraint line 22 when it is straightened. With this structure, when the traction member 23 is used to pull the restraint line 22, the lengths of the restraint line 22 on both sides of the connecting portion 231 are equivalent, and the traction member 23 is subjected to equivalent resistance on both sides, so that the traction member 23 can stably pull the restraint line 22 without easily deviating to one side, thereby improving the stability of the operation. In addition, compared with connecting the traction member 23 to the end portion of the restraint line 22, when the limiting rod releases the circumferential constraint of the restraint line 22, the traction member 23 can avoid following the circumferential movement of the end portion of the restraint line 22, thereby avoiding the traction member 23 generating a pulling force on the subsequent restraint line 22 to be released, and thus the subsequent restraint line 22 to be released can be prevented from moving axially.

[0077] It should be noted that the connecting position of the traction member 23 and the restraint line 22 has multiple possibilities, the traction member 23 can be connected to the end portion or the position adjacent to the end portion of the restraint line 22, or can be connected to the middle portion of the restraint line 22, as long as the traction member 23 can pull the restraint line 22 away from the tubular body 11. The connecting position and the connecting manner of the traction member 23 and the restraint line 22 are not limited herein.

[0078] Please refer to Figure 14 And Figure 15 The traction member 23 is connected to the limiting rod 21 through the connecting member 24, and the traction member 23 is separated from the tubular body 11 distally by the limiting rod 21, so that the locking portion 221 can be released by moving the limiting rod 21 distally relative to the tubular body 11, and the restraint line 22 can be withdrawn through the traction member 23, and the overall operation is coherent, improving the convenience of the operation.

[0079] It should be noted that the traction member 23 and the connecting member 24 can be an integral structure, and more specifically, the traction member 23 and the connecting member 24 are one structural member, i.e., the traction member 23 is directly connected with the limiting rod 21. In some embodiments, the traction member 23 and the connecting member 24 can be a flexible structure, such as a string or a wire, which are connected together.

[0080] In some embodiments, the traction member 23 and the connecting member 24 can also be provided separately and connected together by welding, bonding or weaving.

[0081] In this embodiment, the connecting member 24 and the limiting rod 21 are movably connected with each other. As shown in Figure 16 and Figure 18 When the limiting rod 21 moves relative to the tubular body 11 to the position where the tubular body is fully deployed, the limiting rod 21 can pull the connecting member 24 to move distally, so that the connecting member 24 drives the traction member 23 to move, and the traction member 23 moves the restraint line 22 away from the tubular body 11 and out of the body.

[0082] The connecting member 24 is provided with a constraint portion 241, and the limiting rod 21 movably penetrates the constraint portion 241. The limiting rod 21 is provided with a protrusion 211, and when the protrusion 211 moves with the limiting rod 21 to the constraint portion 241, the protrusion 211 limits the constraint portion 241 along the axial direction of the limiting rod 21.

[0083] The constraint portion 241 is annular, and the protrusion 211 is a spherical protrusion 211. The diameter of the constraint portion 241 is smaller than the diameter of the protrusion 211, so that when the protrusion 211 moves to the constraint portion 241, the protrusion 211 cannot pass through the constraint portion 241. When the limiting rod 21 continues to move distally, the constraint of the protrusion 211 and the constraint portion 241 along the axial direction of the tubular body 11 enables the limiting rod 21 to drive the connecting member 24 to move, so that the traction member 23 can pull the restraint line 22 out.

[0084] The constraint portion 241 is not limited to be annular, and in other embodiments, the constraint portion 241 can also be an open hook structure, as long as the constraint portion 241 can cooperate with the protrusion 211 to enable the connecting member 24 to move axially relative to the tubular body 11 together with the limiting rod 21.

[0085] In addition, in other embodiments, the connecting member 24 can also be fixedly connected with the limiting rod 21. The length of the limiting rod 21 is relatively long, so that before the limiting rod 21 releases the constraint of all the restraint lines, the connecting member 24 is in a relaxed state and does not pull the restraint line 22. After the limiting rod 21 releases the constraint of all the restraint lines 22, the limiting rod 21 continues to move in the direction of being pulled out of the body, the connecting member 24 gradually becomes straight, and moves out of the body together with the limiting rod 21, so as to pull the restraint line 22 away from the tubular body.

[0086] As shown in Figure 14 , when the lumen stent 100 is in the semi-released state, i.e. all the restraint lines 22 are circumferentially constrained to the tubular body 11, the axial distance (i.e. the distance along the axial direction of the tubular body 11) between the proximal end 21a of the limiting rod 21 and the locking portion 221 closest to the distal end (hereinafter referred to as “the distal-most end”) of the tubular body 11 is L1, and the distance from the protrusion 211 to the constraint portion 241 is L2, where L1 < L2. In combination with Figure 16 and Figure 17 , by virtue of this structural arrangement, the proximal end 21a of the limiting rod 21 is first detached from the locking portion 221 located at the distal-most end of the tubular body 11 before the protrusion 211 moves to the position of the constraint portion 241, thereby avoiding the situation that the limiting rod 21 drives the traction member 23 to compress the tubular body 11 via the connecting member 24 before the locking portion 221 is released, which affects the positioning stability of the tubular body 11.

[0087] It should be noted that in some embodiments, even if the tubular body 11 is not fully expanded (the limiting rod 21 has constraint on the locking portion 221), when the limiting rod 21 is moved distally, the limiting rod 21 drives the traction member 23 to move so that the traction member 23 pulls the restraint line 22, and the further compression amount of the restraint line 22 on the tubular body 11 is also limited, thereby having little effect on the release accuracy of the tubular body 11, and therefore, it is not necessary for the proximal end of the limiting rod 21 to be first detached from the locking portion 221 located at the distal-most end of the tubular body 11 before the protrusion 211 moves to the position of the constraint portion 241.

[0088] It should be noted that the restraint channel can also be formed in other structures. For example, in some embodiments, in combination with Figure 19 and Figure 20 , the outer surface of the tubular body 11 is provided with a covering 104, and the covering 104 and the coating 102 form a restraint channel, so that the restraint line 22 is movably arranged in the restraint channel, and the restraint channel can have a good limiting effect on the restraint line 22 located therein, so that the restraint line 22 circumferentially constrains the tubular body 11.

[0089] The restraint channel on the tubular body 11 has a central angle less than 360° along the circumferential direction of the tubular body 11, and forms at least one opening, the opening is in communication with the inner cavity of the restraint channel, the restraint line 22 is arranged in the restraint channel, and the two locking portions 221 are respectively arranged to pass through the circumferential sides of the opening and are connectable with the limiting rod 21.

[0090] When the binding channel has only one opening, the opening can be used for the locking portion 221 to pass out to be connected with the limiting rod 21 in a detachable manner, and the opening can also be used for the end portion of the binding line 22 to be exposed to be connected with the traction member 23. When the limiting rod 21 releases all the locking portions 221, that is, the proximal end 21a of the limiting rod 21 is separated from the locking portion 221 closest to the distal end on the tubular body 11, the binding line 22 is separated from the tubular body 11 under the traction of the traction member 23.

[0091] As shown in Figure 19 The covering 104 is provided with an opening 104a and an opening 104b. The openings on the covering 104 are connected with the inner cavity of the binding channel, so that the binding line 22 in the binding channel can be exposed from the openings. Specifically, the locking portion 221 of the binding line 22 passes out of the opening 104a to be connected with the limiting rod 21 in a detachable manner. The portion of the binding line 22 exposed from the opening 104b can be connected with the traction member 23, so that when the tubular stent 100 is completely expanded, the traction member 23 can withdraw the binding line 22 out of the body (see Figure 21 ).

[0092] More openings can be provided on the covering 104, for example, two or more openings, as long as one of them can be used for the binding line 22 to cooperate with the limiting rod 21 or the traction member 23.

[0093] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0094] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A lumen stent comprising a tubular body and a semi-release device connected to the tubular body, characterized in that, The semi-releasing device comprises a limiting rod and a binding line, two locking portions are arranged on the binding line, and the two locking portions are detachably connected with the limiting rod; when the two locking portions are connected with the limiting rod, the binding line circumferentially restricts the tubular body; the semi-releasing device comprises a traction member, the traction member is connected with the binding line and the limiting rod, the traction member is movably connected with the limiting rod through a connecting member; when the limiting rod is separated from the locking portion so that the binding line releases the circumferential restriction on the tubular body, the traction member is controlled to move distally relative to the tubular body, the traction member pulls the binding line away from the tubular body, the connecting member is provided with a restriction portion, the limiting rod is movably arranged in the restriction portion, the limiting rod is provided with a protrusion, when the protrusion moves to the restriction portion along with the limiting rod, the limiting rod drives the traction member to separate from the tubular body.

2. The intraluminal stent of claim 1, wherein, The diameter of the limiting rod is 0.2mm-0.6mm.

3. The intraluminal stent of claim 1, wherein, The traction member is connected with the middle part of the binding line.

4. The intraluminal stent of any one of claims 1-3, wherein, The restriction portion is annular.

5. The intraluminal stent of any one of claims 1-3, wherein, The restriction portion is an open hook structure.

6. The intraluminal stent of any one of claims 1-3, wherein, When all the binding lines circumferentially restrict the tubular body, the axial distance between the proximal end of the limiting rod and the locking portion closest to the distal end on the tubular body is L1, and the distance from the protrusion to the restriction portion is L2, wherein L1 7. The intraluminal stent of claim 5, wherein, The traction member is integrally formed with the connecting member.

8. The intraluminal stent of claim 1, wherein, The tubular body is provided with a binding channel, the corresponding central angle of the binding channel is less than 360°, and at least one opening is formed, the opening is connected with the inner cavity of the binding channel, the binding line is arranged in the binding channel, and the two locking portions are arranged on the circumferential sides of the opening and connected with the limiting rod.

9. The intraluminal stent of claim 8, wherein, The tube stent comprises a covering film capable of isolating blood flow, the outer surface of the covering film is provided with a covering, and the binding channel is formed between the covering and the covering film.

10. The intraluminal stent of claim 8, wherein, The tubular body is provided with a plurality of limiting ring buckles, the binding channel is formed by the plurality of limiting ring buckles, and the binding line is arranged in the limiting ring buckles.

11. The intraluminal stent of claim 10, wherein, The tubular body comprises a plurality of wave-shaped rings, the wave-shaped ring comprises a plurality of wave crests, a plurality of wave troughs and a plurality of connecting rods connecting adjacent wave crests and wave troughs; In a natural state, the straight-line distance between adjacent limiting ring buckles is m, the vertical distance between the fixed point of the limiting ring buckle and the wave trough below the limiting ring buckle closest to the limiting ring buckle is n, and m and n satisfy m≤2n.

Images