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 outside the tubular body and a binding line and a limiting buckle arranged on the tubular body; the tubular body comprises a binding area and a non-binding area distributed in the circumferential direction; the binding line is arranged in the binding area; the binding line comprises a fixed end, a binding part and a locking part connected to each other; the fixed end is fixedly connected to the tubular body; the locking part and the limiting buckle are both connected to the limiting rod in a detachable manner; and the binding line circumferentially restricts the binding area when the locking part and the limiting buckle are both connected to the limiting rod. The lumen stent can be in a semi-releasing state through uniform compression of the circumferential local area of the lumen stent, so that 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, in particular 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, quick recovery and few complications, and it has become a first-line treatment method. During the operation, under the monitoring of X-ray perspective, the covered stent is sent to the lesion site through the 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 the 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 located outside the tubular body and a limiting buckle provided on the tubular body, the tubular body comprises a bound area and a non-bound area distributed in the circumferential direction, the bound line is provided in the bound area, the bound line comprises a fixed end, a bound part and a locking part connected to each other, the fixed end is fixedly connected with the tubular body, and the locking part and the limiting buckle are connected with the limiting rod in a separable manner. When the locking part and the limiting buckle are connected with the limiting rod, the bound line circumferentially constrains the bound area.

[0007] In the lumen stent, the semi-release device further comprises a limiting ring buckle, the limiting ring buckle is arranged on the outer surface of the tubular body, and the bound line is arranged in the limiting ring buckle.

[0008] In the lumen stent, 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 respectively connecting adjacent wave crests and wave troughs.

[0009] The number of the limiting ring buckles is multiple, and the distance between two adjacent limiting ring buckles along the circumferential direction of the tubular body is m, and the vertical distance between the fixed point of the limiting ring buckle and the valley located below the limiting ring buckle and closest to the limiting ring buckle is n, and m and n satisfy m≤2n.

[0010] In the tubular cavity stent, the half-releasing device comprises at least one pair of the binding lines arranged in pairs, and the fixed ends of the binding lines arranged in pairs are respectively located on the two sides of the limiting buckle along the circumferential direction of the tubular body.

[0011] In the tubular cavity stent, the length ratio of the binding lines arranged in pairs is T1, and the distance ratio of the fixed ends of the binding lines arranged in pairs to the central axis of the limiting buckle is T2, and T1=T2.

[0012] In the tubular cavity stent, the lengths of the binding lines arranged in pairs are equal, and the distances from the fixed ends of the binding lines arranged in pairs to the limiting buckle along the circumferential direction of the tubular body are equal.

[0013] In the tubular cavity stent, when the binding lines arranged in pairs are circumferentially constrained to the binding area under the circumferential limitation of the limiting rod, the locking portions of the binding lines arranged in pairs are axially limited to each other.

[0014] In the tubular cavity stent, the locking portion is a circular ring or a semi-circular ring structure formed by winding the binding line, when the binding lines arranged in pairs are circumferentially constrained to the binding area under the circumferential limitation of the limiting rod, the locking portions of the binding lines arranged in pairs are not hooked to each other, so that when the limiting rod and the limiting buckle are separated, the binding lines arranged in pairs are separated from each other.

[0015] In the tubular cavity stent, among the binding lines arranged in pairs, the binding line sleeved on the limiting rod has two traction sections, and at least one of the two traction sections is threaded through the locking portion of the other binding line.

[0016] In the tubular cavity stent, the proximal end of the limiting rod is provided with a guide head, and the ratio of the size of the guide head in the radial direction of the limiting rod to the diameter of the limiting rod is 1-1.5.

[0017] In summary, the lumen stent of the present invention has the following beneficial effects: This application provides a semi-release device on the lumen stent, which includes a limiting rod located outside the tubular body and a binding line and a limiting buckle disposed on the tubular body. The tubular body includes a binding area and a non-binding area distributed along the circumferential direction. The binding line is disposed in the binding area and includes a fixed end, a binding part, and a locking part connected together. The fixed end is fixedly connected to the tubular body. The locking part and the limiting buckle are both detachably connected to the limiting rod. When both the locking part and the limiting buckle are connected to the limiting rod, the binding line circumferentially constrains the binding area. By uniformly compressing a local area of ​​the lumen stent in the circumferential direction, the lumen stent can be in a semi-release state, thereby allowing for adjustment and positioning of the lumen stent and improving the accuracy of axial and circumferential positioning of the lumen stent. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the lumen stent provided in one embodiment of the present invention in a semi-released state;

[0020] Figure 2 yes Figure 1 Enlarged view of part A of the lumen support shown;

[0021] Figure 3 yes Figure 1 The diagram shows the lumen support when it is fully deployed.

[0022] Figure 4 yes Figure 1 The diagram shows the lumen support when it is fully deployed.

[0023] Figure 5 This is a schematic diagram of the binding line of a lumen stent crossing a trough in one embodiment.

[0024] Figure 6 This is a schematic diagram of the limiting ring of a lumen stent according to one embodiment;

[0025] Figure 7 This is a schematic diagram of a lumen stent in one embodiment when the binding line has not crossed the trough.

[0026] Figure 8 This is a schematic diagram of the lumen stent provided in Embodiment 2 of the present invention in a semi-released state;

[0027] Figure 9 yes Figure 8 Enlarged view of part B of the lumen support shown;

[0028] Figure 10 yes Figure 9A schematic view of the lumen stent shown in the fully expanded state;

[0029] Figure 11 A schematic view of the lumen stent shown in the semi-released state according to the third embodiment of the present application;

[0030] Figure 12 A schematic view of the lumen stent shown in the fully expanded state; Figure 11 An enlarged view of the C portion of the lumen stent shown;

[0031] Figure 13 A schematic view of the lumen stent shown in the fully expanded state; Figure 11 A schematic view of the lumen stent shown in the fully expanded state;

[0032] Figure 14 A schematic view of the lumen stent shown in the fully expanded state;

[0033] Figure 15 A schematic view of the lumen stent shown in the fully expanded state; Figure 14 A schematic view of the lumen stent shown in the fully expanded state;

[0034] Figure 16 A schematic view of the lumen stent shown in the fully expanded state;

[0035] Figure 17 A schematic view of the lumen stent shown in the fully expanded state; DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, 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 specific details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application. Therefore, the specific embodiments described herein are not intended to be limiting, but merely to illustrate and teach various embodiments of the present application.

[0037] It is to be understood 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. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will also be understood that, when a term is used herein to describe a feature, it is intended to encompass both the feature and the absence of the feature.

[0038] 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.

[0039] It should be noted that the end of the luminal stent close to the heart after release is defined as the proximal end, and the end far from the heart is defined as the distal end.

[0040] Referring 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, a binding line 22 and a limiting buckle 23. The limiting rod 21 is located outside the tubular body 11, and the binding line 22 and the limiting buckle 23 are both arranged on the tubular body 11.

[0041] The tubular body 11 comprises a binding area 111 and a non-binding area 112 distributed in the circumferential direction. The binding line 22 is arranged in the binding area 111, and the binding line 22 comprises a fixed end 22a, a binding part 22b and a locking part 22c connected in sequence. The fixed end 22a is fixedly connected with the tubular body 11. As shown in the figure, Figure 2 As shown in the figure, the locking part 22c and the limiting buckle 23 are both connected with the limiting rod 21 in a separable manner. When the locking part 22c and the limiting buckle 23 are both connected with the limiting rod 21, the binding line 22 circumferentially constrains the binding area 111. Referring to Figure 3 When the limiting rod 21 is separated from the locking part 22c and the limiting buckle 23, the limiting rod 21 releases the constraint on the locking part 22c, and then the binding line 22 releases the circumferential constraint on the binding area 111, and the tubular body 11 is completely unfolded.

[0042] Since the binding line 22 is fixed on the tubular body 11 through the fixed end 22a, when the limiting rod 21 releases the constraint on the locking part 22c, the fixed end 22a can prevent the binding line 22 from separating from the luminal stent 100 and entering the downstream blood vessel.

[0043] The present application provides a 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 does not conform to 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, and the luminal stent 100 is unfolded and adheres to the wall.

[0044] It can be understood that if the outer diameter of the circumscribed circle of the cross section of the tubular stent 100 in the semi-released state is too large, the stent is prone to adhere to the wall, which is not conducive to the adjustment of the axial and circumferential directions. If the outer diameter of the circumscribed circle of the cross section of the tubular stent 100 in the semi-released state is too small, the semi-released effect is not great, and there is still a large positioning deviation in the circumferential and axial directions. Therefore, in the embodiment, the ratio of the outer diameter of the circumscribed circle of the cross section of the tubular stent 100 in the semi-released state to the outer diameter of the circumscribed circle of the cross section of the tubular stent 100 in the unfolded state is 0.6-0.8.

[0045] The circumferential angle covered by the non-binding area 112 is 180°-340°, that is, the circumferential angle covered by the binding area 111 is 20°-180°, so as to control the circumferential constraint range of the binding wire 22 on the binding area 111 within a reasonable range, thereby facilitating the adjustment of the axial and circumferential directions of the tubular stent 100 in the semi-released state.

[0046] The non-binding area 112 is provided with a branch opening (not shown in the figure), and the edge of the branch opening is provided with a developing structure. When the semi-releasing device 20 binds the binding area 111, the branch opening in the non-binding area 112 is in a fully unfolded state. When the position of the branch opening is positioned, the branch opening in the unfolded state and the developing structure are more accurate in positioning. By binding only the binding area 111 by the semi-releasing device 20, it is especially beneficial for the positioning of the tubular stent with a branch opening.

[0047] Please refer to Figure 4 The semi-releasing device 20 further comprises a limiting ring buckle 24 arranged on the outer surface of the tubular body 11, and the binding wire 22 is arranged to pass through the limiting ring buckle 24, so as to uniformly compress the tubular body 11 by the binding wire 22, thereby improving the accuracy of the overall positioning of the stent. Moreover, when the tubular stent 100 is compressed in the delivery sheath or the constraint of the binding wire 22 on the tubular stent 100 is released, the limiting ring buckle 24 can also prevent the axial displacement of the binding wire 22. Of course, in other embodiments, the limiting ring buckle 24 can also be arranged on the inner surface of the tubular body 11.

[0048] It should be noted that the structure of the tubular stent 100 forming the tubular body 11 has multiple possibilities, as long as the tubular stent 100 forms a hollow tubular structure to form a blood flow passage by using the lumen of the tubular stent 100.

[0049] In some embodiments, the tubular body 11 comprises a plurality of wave-shaped rings 101 (such as Figure 6As shown in the drawings, each wave-shaped ring 101 comprises a plurality of wave crests, a plurality of wave troughs, and a plurality of connecting rods connecting adjacent wave crests and wave troughs, respectively. The plurality of wave-shaped rings 101 are arranged in sequence from the proximal end to the distal end, preferably in parallel and at intervals. The wave-shaped ring 101 has a closed cylindrical structure, and the plurality of wave-shaped rings 101 can have the same or similar wave shapes. It can be understood that the specific structure of the wave-shaped ring 101 is not limited in the embodiment, and the wave shape of the wave-shaped ring 101 can be set as needed. Meanwhile, the number of wave shapes in each wave-shaped ring 101 and the wave height can also be set as needed.

[0050] The plurality of wave-shaped rings 101 are connected with a film 102. The plurality of wave-shaped rings 101 are made of materials with good biocompatibility, such as nickel-titanium, stainless steel, and the like. The film 102 is made of high polymer materials with good biocompatibility, such as PTFE, FEP, PET, and the like.

[0051] The size of the limiting ring buckle 24 is 100% to 200% of the cross-sectional area of the binding line 22. If the size of the limiting ring buckle 24 is too large, the axial movable range of the binding line 22 is large, which affects the radial compression effect of the stent. If the size of the limiting ring buckle 24 is too small, the friction between the limiting ring buckle 24 and the binding line 22 is increased, which affects the relative movement of the binding line 22 and the limiting ring buckle 24 along the circumference of the tubular body 11, and is not conducive to the smooth expansion of the lumen stent 100.

[0052] The number of limiting ring buckles 24 can be multiple, and the multiple limiting ring buckles 24 are uniformly distributed along the circumference of the tubular body 11 at the binding area 111, so that the binding line 22 is hung on the outer surface of the tubular body 11 by the multiple limiting ring buckles 24, which has a good limiting effect on the binding line 22, so as to improve the stability and accuracy of the binding line 22 in the circumferential constraint of the binding area 111.

[0053] Please refer to Figure 5 If the distance between the two limiting ring buckles 24 is too long, when the lumen stent 100 is in a completely radially compressed state in the delivery sheath, the binding line 22 is in a loose state, and the binding line 22 between the two limiting ring buckles 24 is axially displaced, or even hooks on the wave trough of the wave-shaped ring 101. When the lumen stent 100 is completely released from the delivery sheath, the binding line 22 is hooked on the wave-shaped ring 101, which causes the lumen stent 100 to fail to expand normally.

[0054] Please refer to Figure 6In the natural state (i.e. when the lumen stent 100 is fully released), the distance between two adjacent limiting ring buckles 24 in the circumferential direction of the tubular body 11 is m, that is, the arc length of the portion of the tubular body 11 between the two adjacent limiting ring buckles 24, and the vertical distance between the fixed point of the limiting ring buckle 24 and the valley below the limiting ring buckle 24 closest to the limiting ring buckle 24 is n, where m and n satisfy m≤2n. Please refer to Figure 7 When the lumen stent 100 is in a fully radially compressed state in the delivery sheath, the lumen stent 100 can avoid the binding line 22 crossing the valleys of the wave-shaped ring 101 when the lumen stent 100 is in a radially compressed state.

[0055] In the present embodiment, as shown in Figure 1 , the number of binding lines 22 is multiple, and the multiple binding lines 22 are distributed in the axial direction. The binding line 22 can be a flexible line with strong tensile resistance, such as a PTFE line or a polyester suture. The fixed end 22a can be fixed to the film 102 or the multiple turns of the wave-shaped ring 101 by knotting or the like. The binding part 22b of the binding line 22 can be composed of a single flexible line or multiple flexible lines. The locking part 22c can be selected but not limited to a binding line ring, a metal ring, etc. The limiting ring buckle 24 is arranged on the wave-shaped ring 101, which not only facilitates the radial compression of the stent by the binding line 22 arranged in the limiting ring buckle 24, but also reduces the risk of damage to the film by the binding line 22. Preferably, the limiting ring buckle 24 is located at the middle of the connecting rod of the wave-shaped ring 101, so as to make the stress of the wave-shaped ring 101 uniform.

[0056] The limiting rod 21 can be selected to have 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 0.2mm-0.6mm, 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 lumen stent 100 as a whole, and that the diameter of the limiting rod 21 is too large to have insufficient support and affect the restraining effect on the locking part 22c and the limiting buckle 23.

[0057] In some embodiments, the surface roughness of the limiting rod 21 is less than or equal to 0.2μm, so that the limiting rod 21 can be smoothly pulled out of the locking part 22c and the limiting buckle 23, thereby releasing the restraint on the locking part 22c and the limiting buckle 23.

[0058] In some embodiments, the proximal end 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 limiting buckle 23, and the guide head reduces the damage to the blood vessel caused by the limiting rod 21.

[0059] In some embodiments, the guide head is a soft head arranged at the proximal end of the limiting rod 21; thus, the soft head is used to avoid damage to the blood vessel caused by the proximal end of the limiting rod 21. Specifically, the length of the soft head is set to 10-20 mm, which can maintain the constraint of the limiting rod 21 on the locking portion 22c and the limiting buckle 23, while avoiding damage to 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 restraint line 22, which may cause the locking portion 22c or the limiting buckle 23 to be released from the limiting rod 21 due to insufficient support of the soft head. If the soft head is too short, the flexibility of the soft head is insufficient, which may damage the blood vessel.

[0060] In other embodiments, the guide head is a ball head formed at the proximal end of the limiting rod 21. For example, when a metal guide wire is used to make the limiting rod 21, a ball head can be formed at the proximal end of the limiting rod 21 by spot welding.

[0061] 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 may increase the resistance when the guide wire is pulled out. The diameter of the ball head is 0.3-0.6 mm

[0062] The diameter of the guide wire should not be too large or too small. If it is too large, the overall profile (silhouette) of the stent will be increased, 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 0.3 mm, the blood vessel may be easily damaged, and if the diameter is greater than 150% of the diameter of the guide wire, the guide wire may be stuck between the ball head and the long line buckle when it is pulled out, which may not be easily released.

[0063] Please refer to Figure 8 , Figure 9 and Figure 10 , the second embodiment of the present application provides a tubular stent 100, which is substantially the same as the tubular stent 100 of the first embodiment. The tubular stent 100 comprises a tubular body 11 and a semi-release device 20 connected to the outer surface of the tubular body 11. The semi-release device 20 comprises a limiting rod 21 located outside the tubular body 11 and a restraint line 22 wound around the tubular body 11.

[0064] The second embodiment is different from the first embodiment in that the semi-release device 20 comprises at least one pair of restraint lines 22 arranged in pairs, and the fixed ends 22a of the restraint lines 22 arranged in pairs are located on both sides of the limiting buckle 23 along the circumference of the tubular body 11.

[0065] The pair of restraint lines 22 can simultaneously release the restraint of the restraint area 111 of the tubular body 11 when the limiting rod 21 is separated from the locking portion 22c of the pair of restraint lines 22, so that the tubular luminal stent 100 is more quickly deployed and adhered to the wall. At the same time, since the fixed ends 22a of the pair of restraint lines 22 are respectively located on both sides of the limiting buckle 23, when the pair of restraint lines 22 release the restraint of the restraint area 111 of the tubular body 11, the restraint area 111 expands towards the fixed ends 22a located on both sides of the limiting buckle 23, that is, the restraint area 111 expands in two opposite directions along the circumference of the tubular luminal stent 100, so as to offset the circumferential force generated by the tubular luminal stent 100 during the expansion process, thereby improving the release stability of the tubular luminal stent 100 and making the positioning more accurate.

[0066] The length ratio of the pair of restraint lines 22 is T1, and the distance ratio of the fixed ends 22a of the pair of restraint lines 22 to the center axis of the limiting buckle 23 is T2, T1=T2. The center axis of the limiting buckle 23 can be defined by the limiting rod 21 passing through the limiting buckle 23. Specifically, without considering the shape and position error of the longitudinal axis of the limiting rod 21 relative to the tubular body 11 caused by the movement of the limiting rod 21 in the limiting buckle 23, the longitudinal axis of the limiting rod 21 coincides with the center axis of the limiting buckle 23. In this embodiment, the length ratio of the pair of restraint lines 22 is set to be equal to the distance ratio of the fixed ends 22a of the pair of restraint lines 22 to the center axis of the limiting buckle 23, so that when the pair of restraint lines 22 simultaneously release the circumferential constraint of the restraint area 111, the circumferential force of the restraint area 111 expanding in two opposite directions can be well offset.

[0067] For example, in some embodiments, the lengths of the pair of restraint lines 22 are equal, and the distances of the fixed ends 22a of the pair of restraint lines 22 to the limiting buckle 23 along the circumference of the tubular body 11 are equal. Through this structural arrangement, the pair of restraint lines 22 constrain the restraint area 111 in the circumferential direction to a similar extent, so that when the limiting rod 21 is separated from the locking portion 22c of the pair of restraint lines 22, the pair of restraint lines 22 simultaneously release the circumferential constraint of the restraint area 111, and the circumferential force of the restraint area 111 expanding in two opposite directions is substantially equal, so that it can be well offset, so that the tubular luminal stent 100 is released more stably and positioned more accurately.

[0068] It can be understood that the number of groups of the pair of restraint lines 22 is not limited in the present application, for example, as shown in Figure 8As shown, the half-releasing device 20 includes 3 pairs of restraint lines 22. In other embodiments, the half-releasing device 20 can also include 2 pairs or more than 2 pairs of restraint lines 22. Alternatively, the half-releasing device 20 can include non-paired restraint lines 22 in addition to the paired restraint lines 22, so that part of the restraint lines 22 are paired and the other part of the restraint lines 22 are non-paired, thereby improving the flexibility of the process of axially constraining the constrained area 111.

[0069] As shown in Figure 11 , Figure 12 and Figure 13 , the third embodiment of the present application provides a lumen stent 100 which is substantially the same as the lumen stent 100 of the first embodiment, and the lumen stent 100 includes a tubular body 11 and a half-releasing device 20 connected to the outer surface of the tubular body 11.

[0070] The third embodiment differs from the first embodiment in that when the paired restraint lines 22 are circumferentially constrained to the constrained area 111 under the circumferential constraint of the limiting rod 21, the locking portions 22c of the paired restraint lines 22 are axially constrained to each other, thereby ensuring that the positions where the locking portions 22c of the paired restraint lines 22 apply forces to the limiting rod 21 are consistent, so as to avoid the risk that the forces applied by the paired restraint lines 22 to the limiting rod 21 are not at the same position in the axial direction of the limiting rod 21 and the limiting rod 21 is bent and deviated. Through this structural arrangement, when the limiting rod 21 is in the state of constraining the paired restraint lines 22, the paired restraint lines 22 can stably maintain the constrained area 111 in a compressed state, thereby effectively improving the overall stability of the lumen stent 100.

[0071] The locking portion 22c is a circular ring or a semi-circular ring structure formed by winding the restraint line 22, and when the paired restraint lines 22 are circumferentially constrained to the constrained area 111 under the circumferential constraint of the limiting rod 21, the locking portions 22c of the paired restraint lines 22 do not hook each other, so that when the limiting rod 21 is separated from the limiting buckle 23, the paired restraint lines 22 are separated from each other, thereby meeting the need of releasing the circumferential constraint to the constrained area 111.

[0072] As shown in Figure 16 and 17 , of the paired restraint lines 22, the restraint line 22 sleeved on the limiting rod 21 has 2 traction sections 221, and at least one of the 2 traction sections 221 is threaded through the locking portion 22c of the other restraint line 22.

[0073] It should be noted that when the locking portion 22c is in a circular ring structure, only one of the locking portions 22c of the pair of restraint lines 22 is sleeved on the limiting rod 21 and passes through the other locking portion 22c of the restraint line 22, so that the pair of restraint lines 22 are restrained on the limiting rod 21 and are limited in the axial direction of the limiting rod 21. That is, in this structure, the locking portions 22c of the pair of restraint lines 22 are restrained at a unified position and cannot move relative to each other in the axial direction, so that the risk that the force applied by the pair of restraint lines 22 to the limiting rod 21 is not at the same position in the axial direction of the limiting rod 21 and the limiting rod 21 is bent and deviated can be avoided.

[0074] For example, as shown in FIGS. 1 and 2, if the two restraint lines 22 do not constrain each other in the axial direction of the limiting rod 21, the two restraint lines 22 apply opposite forces to the limiting rod 21, and the locking portions 22c of the two restraint lines 22 can move relative to each other in the axial direction of the limiting rod 21, so that the two restraint lines 22 can bend the limiting rod 21 at different positions in the axial direction of the limiting rod 21, which affects the stability of the limiting rod 21 in restraining the lumen stent 100 in the semi-released state. Figure 14 Figure 15 For example, as shown in FIGS. 1 and 2, if the two restraint lines 22 do not constrain each other in the axial direction of the limiting rod 21, the two restraint lines 22 apply opposite forces to the limiting rod 21, and the locking portions 22c of the two restraint lines 22 can move relative to each other in the axial direction of the limiting rod 21, so that the two restraint lines 22 can bend the limiting rod 21 at different positions in the axial direction of the limiting rod 21, which affects the stability of the limiting rod 21 in restraining the lumen stent 100 in the semi-released state.

[0075] The technical features of the above-described embodiments can be combined in any manner. 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 contradict each other, they should be considered within the scope of the present disclosure.

[0076] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope 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-release device includes a limiting rod located outside the tubular body and a binding line and a limiting buckle disposed on the tubular body. The tubular body includes a binding area and a non-binding area distributed along the circumferential direction. The binding line is disposed in the binding area and includes a fixed end, a binding part, and a locking part connected together. The fixed end is fixedly connected to the tubular body. The locking part and the limiting buckle are both detachably connected to the limiting rod. When the locking part and the limiting buckle are both connected to the limiting rod, the binding line circumferentially constrains the binding area. The semi-release device includes at least one pair of binding lines disposed along the circumference of the tubular body. The fixed ends of the pair of binding lines are respectively located on both sides of the limiting buckle. When the pair of binding lines circumferentially constrain the binding area under the circumferential limitation of the limiting rod, the locking parts of the pair of binding lines are axially limited to each other. In the pair of binding lines, the binding line sleeved on the limiting rod has two traction sections, and at least one of the two traction sections passes through the locking part of the other binding line.

2. The lumen stent according to claim 1, characterized in that, The semi-release device also includes a limiting ring buckle, which is disposed on the outer surface of the tubular body, and the binding line passes through the limiting ring buckle.

3. The lumen stent according to claim 2, characterized in that, The tubular body includes multiple wave-shaped rings, each wave-shaped ring including multiple peaks, multiple troughs, and multiple connecting rods that connect adjacent peaks and troughs. The number of limiting rings is multiple. In the natural state, the distance between two adjacent limiting rings along the circumference of the tubular body is m. The vertical distance between the fixing point of the limiting ring and the trough located below the limiting ring and closest to the limiting ring is n. m and n satisfy m≤2n.

4. The lumen stent according to claim 2, characterized in that, The size of the limiting ring is 100% to 200% of the cross-sectional area of ​​the binding line.

5. The lumen stent according to claim 1, characterized in that, The ratio of the lengths of the paired binding lines is T1, and the ratio of the distances from the fixed ends of the paired binding lines to the central axis of the limiting buckle is T2, where T1 = T2.

6. The lumen stent according to claim 1, characterized in that, The paired binding lines are of equal length, and along the circumference of the tubular body, the fixed ends of the paired binding lines are equidistant from the limiting buckle.

7. The lumen stent according to any one of claims 1 to 6, characterized in that, The diameter of the limiting rod is 0.2mm~0.6mm.

8. The lumen stent according to claim 1, characterized in that, The locking part is a circular or semi-circular ring structure formed by the binding wire. When the pair of binding wires are circumferentially constrained by the limiting rod, the locking parts of the pair of binding wires do not hook each other, so that when the limiting rod separates from the limiting buckle, the pair of binding wires separate from each other.

9. The lumen stent according to claim 1, characterized in that, The near end of the limiting rod is provided with a guide head, and the ratio of the radial dimension of the guide head to the diameter of the limiting rod is 1 to 1.

5.

10. The lumen stent according to claim 9, characterized in that, The guide head is a soft head disposed at the proximal end of the limiting rod; or, the guide head is a ball head formed at the proximal end of the limiting rod.

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