Connection structure of vascular stent, vascular stent, and pushing method therefor

Abstract

The present invention provides a vascular stent and relates to the technical field of medical instruments. The vascular stent comprises a middle portion and an end portion. The end portion is connected to both ends of the middle portion. The middle portion comprises a plurality of wave-shaped support rings arranged in an axial direction. An S-shaped connecting member is arranged between adjacent wave-shaped support rings. Both ends of the S-shaped connecting member are respectively connected to a crest and a trough of the adjacent wave-shaped support rings. A support portion is arranged on the S-shaped connecting member. When the wave-shaped support ring is compressed and a pushing force is applied, the support portion can abut against the crest and / or trough of the wave-shaped support ring. According to the intracranial vascular stent provided by the present invention, two or even more groups of pushing force transmission channels are formed on one S-shaped connecting member, and the pushing force can be more uniformly transmitted to the wave-shaped support rings, thereby reducing the risk of stent deformation caused by excessive local pushing force, significantly improving the pushing performance of the stent in a microcatheter, and solving the problems of existing intracranial vascular stents being difficult to push and prone to folding.

Description

Connection structure of vascular stent, vascular stent and pushing method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a connection structure of a vascular stent, a vascular stent and a pushing method thereof. BACKGROUND

[0002] With the development of vascular intervention medical technology, minimally invasive intervention surgery has been widely used in the treatment of diseases. In minimally invasive intervention surgery, vascular stents are often used. For example, in the treatment of cerebral apoplexy, two types of intracranial vascular diseases require the use of vascular stents. The first is the treatment of intracranial aneurysm, which often uses coil embolization, that is, a microcatheter is used to deliver a coil to the aneurysm cavity to block the blood circulation in the aneurysm and form a thrombus to occlude the aneurysm. In order to prevent the coil from expanding out of the aneurysm cavity and causing vascular stenosis, the doctor usually implants an auxiliary stent to support the coil. The second is the vascular stenosis caused by atherosclerosis, and the doctor usually implants a stent to expand the stenotic blood vessel to restore it to the required diameter, thereby repairing the blood supply.

[0003] Vascular stents are one of the main devices for the treatment of vascular diseases, but the diameter of the arterial blood vessels is usually very small. For example, the Willis circle of the brain has a diameter ranging from 2.0 to 4.0 mm, the cavernous segment of the internal carotid artery has a diameter ranging from 2.5 to 5.5 mm, the blood vessels of the distal anterior circulation have a diameter ranging from 1.5 to 3.0 mm, and the blood vessels of the posterior circulation have a diameter ranging from 2.0 to 4.0 mm. Moreover, the blood vessels, such as intracranial blood vessels, have many sharp bends with small bend radii, which poses a great challenge to the design of the stent. First, the stent needs to be pushed through the tortuous lumen of the microcatheter to the lesion site, so the stent compressed in the microcatheter must have sufficient flexibility and pushability. Second, after the stent is released, the stent must have good wall adhesion and resistance to bending and folding in the tortuous lesion blood vessel.

[0004] However, in the related art, intracranial vascular stents have limited flexibility and pushability, and are prone to bending and folding.

[0005] Therefore, it is necessary to provide an improved technical solution to overcome the above-mentioned deficiencies in the related art. SUMMARY

[0006] The purpose of the present application is to provide a connection structure of a vascular stent, a vascular stent and a pushing method thereof, which have good flexibility and pushability when compressed and delivered in a microcatheter, and good wall adhesion and resistance to bending and folding in a tortuous lesion blood vessel when released and expanded, to solve the problems of existing vascular stents (e.g., intracranial vascular stents) such as difficulty in pushing and easy folding.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0008] In a first aspect, embodiments of the present application provide a vascular stent, comprising a plurality of wave-shaped support rings arranged in sequence along an axial direction of the vascular stent, and S-shaped connectors arranged between adjacent wave-shaped support rings, wherein each S-shaped connector has two ends respectively connected to a wave crest and a wave trough of two wave-shaped support rings adjacent to the S-shaped connector, and the S-shaped connector has a support portion abutting against the wave crest and / or the wave trough of the wave-shaped support ring when the vascular stent is compressed.

[0009] In some embodiments, the support portion is located at a position where the S-shaped connector protrudes towards the wave-shaped support ring.

[0010] In some embodiments, the support portion is a curved portion of the S-shaped connector protruding towards the wave-shaped support ring adjacent to the S-shaped connector.

[0011] In some embodiments, the S-shaped connectors are distributed at intervals in a circumferential direction of the vascular stent.

[0012] In some embodiments, the S-shaped connectors are arranged in a circumferential array around an axis of the wave-shaped support ring.

[0013] In some embodiments, the support portion on the S-shaped connector has two portions, and when the vascular stent is compressed, the two portions abut against a wave crest and a wave trough of adjacent wave-shaped support rings respectively.

[0014] In some embodiments, the number of wave crests or wave troughs abutting against each support portion is greater than or equal to 2.

[0015] In some embodiments, when the vascular stent is compressed, the two support portions abut against two wave crests of one side of the adjacent wave-shaped support ring and two wave troughs of the other side of the adjacent wave-shaped support ring respectively, so as to additionally form two groups of push force transmission channels at each S-shaped connector.

[0016] In some embodiments, the S-shaped connectors located on the same circumference have the same opening direction.

[0017] In some embodiments, on the same circumference, the S-shaped connectors are distributed at intervals of two wave crests or wave troughs along the wave-shaped support ring adjacent to the S-shaped connector.

[0018] In some embodiments, when the plurality of wave-shaped support rings arranged in sequence along the axial direction of the vascular stent are fully expanded, the wave crests and wave troughs connected by the S-shaped connectors are misaligned in the circumferential direction of the vascular stent by a distance less than 1 / 2 of the wavelength of the wave-shaped support ring.

[0019] In some embodiments, the S-shaped connectors located on both sides of the same wave-shaped support ring have opposite opening directions.

[0020] In some embodiments, the S-shaped connectors located on both sides of the same wave-shaped support ring are misaligned in the circumferential direction of the wave-shaped support ring.

[0021] In some embodiments, the support portion is located at the abdomen of the S-shaped connector.

[0022] In some embodiments, along the axial direction of the vascular stent, the minimum distance between the support portion and the adjacent wave-shaped support ring is D1, and the distance between the wave-shaped support rings on both sides of the support portion is D2, and when the wave-shaped support ring is not expanded, D1≤0.2D2.

[0023] In some embodiments, when the vascular stent is compressed, the distance between the support portion and the adjacent wave-shaped support ring is zero.

[0024] In some embodiments, when the vascular stent is compressed, the support portion abuts against the crest or trough of the adjacent wave-shaped support ring.

[0025] In some embodiments, when the vascular stent is compressed, the upper end and / or the lower end of the S-shaped connector abuts against the adjacent S-shaped connector in the circumferential direction of the wave-shaped support ring.

[0026] In some embodiments, the plurality of wave-shaped support rings arranged in the axial direction form a middle portion.

[0027] In some embodiments, the end of the S-shaped connector close to the crest is the lower end of the S-shaped connector, and the end of the S-shaped connector close to the trough is the upper end of the S-shaped connector, when the vascular stent is compressed, the lower end of the S-shaped connector does not extend beyond the crest connected by the lower end of the S-shaped connector in the circumferential direction of the middle portion, and the upper end of the S-shaped connector extends beyond the trough connected by the upper end of the S-shaped connector in the circumferential direction of the middle portion.

[0028] In some embodiments, the vascular stent further comprises an end portion connected to the end of the middle portion.

[0029] In some embodiments, the diameter of the end portion away from the middle portion is greater than the diameter of the connection between the end portion and the middle portion.

[0030] In some embodiments, the end portion comprises a first end portion and a second end portion, and the middle portion is connected between the first end portion and the second end portion.

[0031] The first end portion adopts a closed loop structure and comprises two wave-shaped support rings arranged in the axial direction of the vascular stent, wherein the crest of one wave-shaped support ring is arranged opposite to the trough of the other wave-shaped support ring and connected by a connector to form a closed loop structure.

[0032] The second end portion adopts an open loop structure and comprises one wave-shaped support ring.

[0033] In some embodiments, the first end portion is connected to the middle portion by an S-shaped connector and / or a straight-shaped connector.

[0034] In some embodiments, the second end portion is connected to the middle portion by an S-shaped connector and / or a straight-shaped connector.

[0035] In some embodiments, when the middle portion is expanded, the opposite wave crest and wave trough of the adjacent wave-shaped support ring form a rotational misalignment, and an angle of the rotational misalignment is less than 1 / 2 of a central angle corresponding to a wavelength of the wave-shaped support ring.

[0036] In some embodiments, the S-shaped connector is provided with a plurality of S-shaped connectors along a circumferential direction of the wave-shaped support ring.

[0037] In some embodiments, the number of the S-shaped connectors along the circumferential direction of each wave-shaped support ring is 3.

[0038] In the second aspect, embodiments of the present application provide a vascular stent, which comprises a middle portion and end portions connected to two ends of the middle portion. The middle portion comprises a plurality of wave-shaped support rings arranged along an axial direction of the vascular stent, and an S-shaped connector is arranged between adjacent wave-shaped support rings. Two ends of the S-shaped connector are connected to a wave crest and a wave trough of adjacent wave-shaped support rings, respectively, and a support portion is arranged on the S-shaped connector, which is used to abut against the wave crest and / or the wave trough of the wave-shaped support ring when the vascular stent is compressed.

[0039] In some embodiments, the S-shaped connectors are distributed at intervals in a circumferential direction of the wave-shaped support ring, and the S-shaped connectors are arranged in a circumferential array around an axis of the wave-shaped support ring.

[0040] In some embodiments, the S-shaped connectors located on both sides of the same wave-shaped support ring have opposite opening directions.

[0041] In some embodiments, the support portion is located at an abdominal portion of the S-shaped connector.

[0042] In some embodiments, along the axial direction of the vascular stent, a minimum distance between the support portion and the adjacent wave-shaped support ring is D1, a distance between the wave-shaped support rings on both sides of the support portion is D2, and when the wave-shaped support ring is not expanded, D1≤0.2D2.

[0043] In some embodiments, when the vascular stent is compressed, the distance between the support portion and the adjacent wave-shaped support ring is zero.

[0044] In some embodiments, when the vascular stent is compressed, the support portion abuts against the wave crest or the wave trough of the adjacent wave-shaped support ring.

[0045] In some embodiments, when the vascular stent is compressed, the number of the wave crest or the wave trough abutting against the same support portion is greater than or equal to 2.

[0046] In some embodiments, when the vascular stent is compressed, the upper end and / or the lower end of the S-shaped connector abut against the S-shaped connector adjacent in the circumferential direction of the wave-shaped support ring.

[0047] In some embodiments, the outer diameter of the end portion is larger than the diameter at the connection between the end portion and the intermediate portion.

[0048] In some embodiments, when the intermediate portion is fully expanded, the misalignment distance between the peaks and valleys connected by the S-shaped connector in the circumferential direction of the vascular stent is less than 1 / 2 of the wavelength of the wave-shaped support ring.

[0049] In a third aspect, embodiments of the present application provide a pushing method for a vascular stent, the vascular stent being the vascular stent described above. The pushing method comprises the following steps: the vascular stent is compressed in the lumen of a microcatheter; when the vascular stent is compressed, the support portion abuts against the peaks and / or valleys of the wave-shaped support ring to additionally form at least one set of pushing force transmission channels at each S-shaped connector; and when the vascular stent is released from the lumen of the microcatheter, the wave-shaped support ring is radially expanded.

[0050] In a fourth aspect, embodiments of the present application provide a connection structure for a vascular stent, which is used to connect between adjacent wave-shaped support rings of the vascular stent. The connection structure is an S-shaped connector, and the S-shaped connector has a support portion for abutting against the peaks and / or valleys of the wave-shaped support ring when the vascular stent is compressed.

[0051] The intracranial vascular stent provided by the present application forms two or more sets of pushing force transmission channels on one S-shaped connector, so that the pushing force can be more uniformly transmitted to the wave-shaped support ring, reducing the risk of stent deformation caused by excessive local pushing force, significantly improving the pushing performance of the stent in the microcatheter, and in the case of consistent pushing effect in the microcatheter, the number of connectors can be relatively reduced, further improving the bending performance of the stent in the compressed state and the expanded state.

[0052] In the expanded state, when the stent conforms to the curvature of the blood vessel, the inner bending side of the stent is compressed, and the outer bending side is stretched. Due to the small-angle rotational misalignment of the opposite peaks and valleys of the wave-shaped support ring, the adjacent peaks and valleys are misaligned, which can avoid interference caused by compression of the inner bending side and prevent mutual collision of the adjacent peaks and valleys when being squeezed. In addition, the S-shaped connector has stretchability in the axial direction of the stent, which can compensate for the stretching of the outer bending side and the compression of the inner bending side, thereby adapting to blood vessels with smaller bending radii.

[0053] When the stent is released from the microcatheter, the opening directions of the adjacent S-shaped connectors are opposite, which can offset each other in rotation along the axis when the stent is released, avoiding instability caused by rotation of the microcatheter in the blood vessel. BRIEF DESCRIPTION OF DRAWINGS

[0054] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an implementation of the application and serve to explain the principles of the application. They do not limit the present application as defined in the appended claims.

[0055] Fig. 1 is a schematic diagram of a related art stent for expanding a stenosis of a blood vessel.

[0056] Fig. 2 is a schematic diagram of a related art stent in which adjacent wave-shaped support rings are connected by a straight-shaped connecting member.

[0057] Fig. 3 is a schematic diagram of a related art stent in which adjacent wave-shaped support rings are connected by a straight-shaped connecting member in another way.

[0058] Fig. 4 is a schematic diagram of a related art stent in which adjacent wave-shaped support rings are connected by a "U"-shaped connecting member.

[0059] Fig. 5 is a schematic diagram of a stent in an expanded state according to an embodiment of the present application.

[0060] Fig. 6 is a schematic diagram of a middle portion of a stent according to an embodiment of the present application.

[0061] Fig. 7 is a schematic diagram of an S-shaped connecting member according to an embodiment of the present application.

[0062] Fig. 8 is a schematic diagram of a distance between a support portion and an adjacent wave-shaped support ring according to an embodiment of the present application.

[0063] Fig. 9 is a schematic diagram of a middle portion of a stent according to an embodiment of the present application.

[0064] Fig. 10 is a schematic diagram of a stent in an expanded state according to an embodiment of the present application.

[0065] Fig. 11 is a schematic diagram of a middle portion of a stent according to an embodiment of the present application.

[0066] Fig. 12 is a schematic diagram of a middle portion of a stent according to an embodiment of the present application.

[0067] Fig. 12 is a schematic diagram of a middle portion of a stent according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0069] In the description of the present application, "peak" and "valley" refer to the positions where the metal wires or non-metal wires constituting the wave-shaped support ring are bent, and are located at the two ends of the wave-shaped support ring along its axial direction. In the same wave-shaped support ring, the bent position at one end is defined as "peak", and the bent position at the other end opposite to the "peak" is defined as "valley". In the description of the present application, unless otherwise specified, "peak" refers to the bent position at the left end of the wave-shaped support ring in the drawings, and "valley" refers to the bent position at the right end of the wave-shaped support ring in the drawings. Of course, the positions of "peak" and "valley" are relative, and they can be exchanged according to needs.

[0070] In the description of the present application, "circumferential direction" refers to the direction around the axis of the wave-shaped support ring.

[0071] In the description of the present application, "abdomen" refers to the position where the S-shaped connecting piece protrudes towards the wave-shaped support ring, "upper end" refers to the position above the "abdomen" on the S-shaped connecting piece, and "lower end" refers to the position below the "abdomen" on the S-shaped connecting piece.

[0072] In the description of the present application, "rotation displacement angle" refers to the angle of rotation of the wave-shaped support ring around its axis.

[0073] In the description of the present application, "wavelength" refers to the distance between adjacent "peaks" or adjacent "valleys" on the wave-shaped support ring, and "wavelength corresponding central angle" refers to the angle through which one "peak" rotates around the axis of the wave-shaped support ring to coincide with the adjacent "peak", or the angle through which one "valley" rotates around the axis of the wave-shaped support ring to coincide with the adjacent "valley".

[0074] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0075] In the description of the present application, several means one or more, and multiple means more than two, greater than, less than, more than, etc. are not included in the number, and above, below, etc. are included in the number.

[0076] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be a fixed connection or a movable connection, or a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, or it can be an internal communication of two elements, an indirect communication or an interaction relationship between two elements.

[0077] The present application will be described in detail below with reference to the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0078] The commonly used connecting piece of intracranial vascular stent has a "one" shape, etc. As shown in FIGS. 1 to 3, adjacent wave-shaped support rings are connected by a "one" connecting piece. In FIG. 2, the start and end points of the "one" connecting piece are the wave peaks and wave troughs of adjacent wave-shaped support rings. In FIG. 3, the start and end points of the "one" connecting piece are the wave peaks of adjacent wave-shaped support rings. As shown by the arrow direction in FIG. 2, a single connecting piece only forms a group of push force transmission channels. However, since the stent is used in a tortuous intracranial blood vessel, in order to maintain the flexibility of the stent as a whole, the number of connecting pieces should not be too large, and usually 3-5 connecting pieces are provided. Therefore, adjacent support rings usually only have 3-5 groups of push force transmission channels. In this way, when the stent is pushed, the stress of the support ring is uneven, and when passing through a blood vessel with a large bending radius, the required pushing force increases, and the stent is prone to local deformation.

[0079] The present application provides a vascular stent (for example, an intracranial vascular stent) to solve the problem that the required pushing force increases and the stent is prone to local deformation when the current vascular stent, such as an intracranial vascular stent, passes through a blood vessel with a large bending radius. Hereinafter, for the convenience of description, the vascular stent of the present application will be described taking the intracranial vascular stent as an example.

[0080] As shown in FIGS. 5 to 7, the intracranial vascular stent includes a middle part 2 and an end part 1 (i.e., an end portion), the end part 1 is connected to both ends of the middle part 2, the middle part 2 includes a plurality of wave-shaped support rings 21 arranged in the axial direction, an S-shaped connecting piece 22 (for example, an S-shaped connecting wire, an S-shaped connecting line, an S-shaped connecting rod or an S-shaped connecting bar, etc.) is arranged between adjacent wave-shaped support rings 21, and the two ends of the S-shaped connecting piece 22 are connected to the wave peak 23 and the wave trough 24 of adjacent wave-shaped support rings 21, respectively. As shown in FIGS. 7 and 9, the S-shaped connecting piece 22 is provided with a support part 221, which can abut against the wave peak 23 and / or the wave trough 24 of the wave-shaped support ring 21 when the wave-shaped support ring 21 is compressed.

[0081] In the present application, as shown in Fig. 5, the end portion 1 at both ends of the intermediate portion 2 adopts a closed loop and an open loop structure respectively, and the connection between the intermediate portion 2 and the end portion 1 can be connected by an S-shaped connecting piece 22 or a straight-shaped connecting piece (for example, a straight-shaped connecting wire, a straight-shaped connecting line, a straight-shaped connecting rod or a straight-shaped connecting bar, etc.).

[0082] In the circumferential direction, the number of connecting pieces in each circle of the end portion 1 is not less than the number of S-shaped connecting pieces 22 in each circle of the intermediate portion 2, and more preferably, the number of S-shaped connecting pieces 22 in each circle of the intermediate portion 2 is less than the number of connecting pieces in each circle of the end portion 1, so that the flexibility of the intermediate portion 2 is better, and a greater degree of bending can be generated without plastic deformation, thereby improving its passing ability through tortuous blood vessels.

[0083] More specifically, when the intracranial blood vessel stent is in a compressed state, if the wave-shaped support ring 21 is compressed by a certain amplitude, the support portion 221 can abut against the wave crest 23 and / or the wave trough 24 of the wave-shaped support ring 21, thereby forming an additional push force transmission channel on the basis of the connection between the S-shaped connecting piece 22 and the wave-shaped support ring 21, providing additional support force for the wave-shaped support ring 21, and making the force on the wave-shaped support ring 21 more uniform. When passing through a blood vessel with a large bending radius, the above-mentioned arrangement can avoid local deformation of the intracranial blood vessel stent.

[0084] When the stent is bent in the blood vessel, the inner bending side of the stent is compressed and the outer bending side is stretched. In the related art, the wave crest 23 and the wave trough 24 in the adjacent support rings are arranged opposite to each other, and when the inner bending side is compressed and bent, they will interfere with each other and be warped. When the outer bending side of the stent is stretched, due to the restriction of the straight-shaped connecting piece on the outer bending side, the outer bending side of the stent cannot be stretched in compliance, and when the bending radius of the blood vessel is small, the stent is easily folded, which reduces the inner hole of the stent and affects blood flow. In the present application, the S-shaped connecting piece 22 is introduced between the wave-shaped support rings 21 of the intermediate portion 2, so that the stent has stretchability in the axial direction. This design allows the S-shaped connecting piece to compensate between the stretching of the outer bending side and the compression of the inner bending side, so that the stent can adapt to a blood vessel with a smaller bending radius, and the risk of folding is reduced.

[0085] In some embodiments of the present application, the S-shaped connectors 22 are distributed in the circumferential direction, and the S-shaped connectors 22 are arranged in a circumferential array around the axis of the wave-shaped support ring 21, as shown in FIG. 5. A plurality of S-shaped connectors 22 are arranged in an array on the circumference formed by the wave-shaped support ring 21, and each S-shaped connector 22 connects two adjacent wave-shaped support rings 21, so that the wave-shaped support ring 21 appears as an open ring structure. When the intracranial blood vessel stent is released from the compressed state, the wave-shaped support ring 21 expands radially, and at the same time, due to the presence of the S-shaped connector 22, the adjacent wave-shaped support rings 21 rotate along their axes, so that the wave crests 23 and wave troughs 24 of the adjacent wave-shaped support rings 21 are misaligned in the circumferential direction. In a blood vessel with a relatively large bending degree, such an arrangement can avoid direct collision between the wave crests 23 and wave troughs 24 of the adjacent wave-shaped support rings 21 that are not connected by the connector, and the misalignment to a certain extent can avoid the intracranial blood vessel stent being folded in a blood vessel with a relatively large bending degree.

[0086] A commonly used blood vessel stent design is provided in patent CN115700113A, which is used in the neuroform series products of Stryker, as shown in FIG. 2. The blood vessel stent is mainly composed of wave-shaped support rings and connecting rods, wherein the wave-shaped support rings are connected by the I-shaped connecting rods, and the wave crests and wave troughs of adjacent wave-shaped support rings have no rotational misalignment.

[0087] In the expanded state, the stent is bent in the blood vessel, the inner bending side of the stent is compressed, and the opposite wave crests and wave troughs interfere with each other and are warped; the outer bending side is stretched, and the I-shaped connecting rod on the outer bending side cannot be stretched in compliance, and when the bending radius of the blood vessel is small, the stent is easily folded, which causes the inner hole of the stent to become smaller and affects blood flow.

[0088] In the compressed state, since the connecting rod is an I-shaped connecting rod, one connecting rod can only form one set of push force transmission channel, and the push force cannot be uniformly transmitted to the wave-shaped support ring. When the push force is large, the local push force may cause the wave-shaped support ring or the connecting rod of the stent to deform, thereby causing the stent to be stuck in the microcatheter.

[0089] The connecting rod of patent CN115700113A is distributed in a spiral shape on the whole stent, and when the stent is released from the microcatheter, it will rotate along the axis, inducing the microcatheter to rotate and thereby destabilizing in the blood vessel.

[0090] As shown in FIG. 4, adjacent wave-shaped support rings can also be connected by curved connecting rods. The shape of the connecting rod in FIG. 4 is U-shaped, and a single connecting rod also only forms one set of push force transmission channel, which cannot solve the problem of uneven force during pushing.

[0091] In some embodiments of the present invention, as shown in FIG6, the S-shaped connectors 22 located at both ends of the same waveform support ring 21 have opposite opening directions. For example, S-shaped connectors 22 are connected to both sides of the same waveform support ring 21, and two adjacent S-shaped connectors 22 in the axial direction of the vascular stent are arranged in a mirror-symmetrical manner, and are offset by one peak and one trough in the circumferential direction of the same waveform support ring 21. When the intracranial vascular stent is released from the microcatheter, it will rotate along the axis. Since the distal end of the stent contacts the vessel wall first, while the proximal end is still in the microcatheter, it will cause the microcatheter to rotate, thereby inducing instability of the microcatheter in the blood vessel. By setting S-shaped connectors 22 with opposite opening directions at both ends of the waveform support ring 21, the adjacent waveform support rings 21 can rotate in opposite directions, thereby canceling the rotation and allowing the stent to be smoothly pushed out of the microcatheter as a whole. In other embodiments, their opening directions may also be the same.

[0092] In some embodiments of the present invention, the support portion 221 is located on the abdomen of the S-shaped connector 22.

[0093] In some embodiments of the present invention, as shown in FIG8, when the vascular stent is in a compressed state (e.g., when it is located in a microcatheter), the distance between the support portion 221 and the adjacent waveform support ring 21 is defined as D1 along the axial direction of the waveform support ring 21, and the distance between the waveform support rings 21 on both sides of the support portion 221 is defined as D2. When the waveform support ring 21 does not expand, D1≤0.2D2, so that the waveform support ring 21 can form an additional pushing force transmission channel through the support portion 221 of the S-shaped connector 22 when subjected to a small amount of compression.

[0094] In some embodiments of the present invention, as shown in FIG9, when the vascular stent is compressed and a pushing force is applied, the two support portions 221 respectively abut against the crests and troughs of the adjacent waveform support rings 21.

[0095] In some embodiments of the present invention, when the waveform support ring 21 is compressed, the distance between the support portion 221 and the adjacent waveform support ring 21 is zero. That is, the support portion 221 does not need to compress the waveform support rings 21 on both sides by applying a pushing force to contact the waveform support rings 21 on both sides and form an additional pushing force transmission channel.

[0096] In some embodiments of the present invention, the support portion 221 abuts against the crest 23 or trough 24 of the adjacent waveform support ring 21, so that an additional pushing force transmission channel is formed at the crest 23 or trough 24 of the waveform support ring 21.

[0097] In some embodiments of the present invention, the number of wave crests 23 or wave troughs 24 that abut against the same support portion 221 is not less than two, so that a support portion 221 can abut against two wave crests 23 or two wave troughs 24 at the same time.

[0098] In some embodiments of the present invention, the upper end and / or lower end of the S-shaped connector 22 abuts against the adjacent S-shaped connector 22 in the circumferential direction, so that a pushing force transmission channel can also be formed between the S-shaped connectors 22, thereby making the circumferential S-shaped connector 22 more uniformly stressed and less prone to deformation.

[0099] In some embodiments of the present invention, the diameter of the outer opening of the end 1 is larger than the diameter of the inner opening where it connects with the middle part 2, so that the end 1 is in the shape of a trumpet.

[0100] In some embodiments of the present invention, when the middle part 2 is fully expanded, the circumferential misalignment distance between the wave crest 23 and the wave trough 24 connected by the S-shaped connector 22 is less than 1 / 2 of the wavelength of the waveform support ring 21.

[0101] The present invention provides a detailed description of an intracranial vascular stent through specific embodiments below.

[0102] In one embodiment of the present invention, a vascular stent, such as an intracranial vascular stent, is provided, as shown in FIG5, comprising a middle portion 2 and an end portion 1. The two ends of the middle portion 2 are connected to the end portion 1 by an S-shaped connector 22, and the end portion 1 is flared. In one example, the end portion 1 at one end of the middle portion 2 is composed of two axially arranged closed-loop connected waveform support rings 21, forming a first end portion 11. The peak of one waveform support ring 21 and the trough of the other waveform support ring 21 are arranged opposite to each other and connected by a straight connector to form a closed-loop structure. The other end 1 of the middle part 2 is composed of a wave support ring 21, forming an open-loop structure. The middle part 2 includes several wave support rings 21 arranged along the axial direction. An S-shaped connector 22 is provided between adjacent wave support rings 21. The two ends of the S-shaped connector 22 are respectively connected to the crest 23 and trough 24 of the adjacent wave support ring 21. The S-shaped connectors 22 are distributed at intervals in the circumferential direction, so that the wave support rings 21 of the middle part 2 have an open-loop structure, thereby improving the flexibility and throughput of the middle part 2. The opening directions of the S-shaped connectors 22 at both ends of the wave support ring 21 are opposite, which can make the force more uniform during pushing.

[0103] When the middle part 2 expands, as shown in Figure 6, the peaks 23 and troughs 24 of the waveform support ring 21 form a small rotational misalignment, causing adjacent peaks 23 and troughs 24 to be offset. This rotational misalignment angle is less than 1 / 2 of the central angle corresponding to the wavelength of the waveform support ring 21, which can prevent the peaks 23 and troughs 24 on the inner side from colliding when the stent passes through the curved blood vessel.

[0104] In this embodiment, as shown in Figures 7 and 9, the S-shaped connector 22 is provided with a support portion 221. The support portion 221 is located on the belly of the S-shaped connector 22. When the middle portion 2 is in a compressed state, the support portion 221 abuts against the peak 23 of the left waveform support ring 21 and the trough 24 of the right waveform support ring 21, respectively, which can form an additional set of pushing force transmission channels, making the support of the S-shaped connector 22 better, reducing the deformation of the S-shaped connector during the pushing process, and preventing the middle portion 2 from folding.

[0105] In another embodiment of the present invention, a vascular stent, such as an intracranial vascular stent, is provided, as shown in FIG10, comprising a middle part 2 and an end part 1. The two ends of the middle part 2 are connected to the end part 1 by a "I"-shaped connector. The end part 1 is funnel-shaped and consists of two axially arranged closed-loop connected waveform support rings 21. The middle part 2 includes a plurality of axially arranged waveform support rings 21. An S-shaped connector 22 is provided between adjacent waveform support rings 21. The two ends of the S-shaped connector 22 are respectively connected to the crest 23 and trough 24 of the adjacent waveform support rings 21. The S-shaped connectors 22 are spaced apart in the circumferential direction, so that the waveform support rings 21 of the middle part 2 have an open-loop structure, thereby improving the flexibility and throughput of the middle part 2. The opening directions of the S-shaped connectors 22 at both ends of the waveform support rings 21 are opposite, which can make the force more uniform during pushing.

[0106] When the middle part 2 expands, as shown in Figure 6, the peaks 23 and troughs 24 of the waveform support ring 21 form a small rotational misalignment. The rotational misalignment angle is less than 1 / 2 of the central angle corresponding to the wavelength of the waveform support ring 21.

[0107] In this embodiment, the S-shaped connector 22 is provided with a support portion 221. The support portion 221 is located on the belly of the S-shaped connector 22. When the middle portion 2 is not expanded, as shown in FIG11, the support portion 221 abuts against the two adjacent peaks 23 of the left waveform support ring 21 and the two adjacent valleys 24 of the right waveform support ring 21, which can additionally form two sets of pushing force transmission channels.

[0108] In another embodiment of the present invention, a vascular stent, such as an intracranial vascular stent, is provided, comprising a middle portion 2 and an end portion 1. The two ends of the middle portion 2 are connected to the end portion 1 by a "I"-shaped connector. The end portion 1 is funnel-shaped and consists of two axially arranged closed-loop connected waveform support rings 21. The middle portion 2 includes a plurality of axially arranged waveform support rings 21. An S-shaped connector 22 is provided between adjacent waveform support rings 21. The two ends of the S-shaped connector 22 are respectively connected to the crests 23 and troughs 24 of adjacent waveform support rings 21. The S-shaped connectors 22 are spaced apart in the circumferential direction, so that the waveform support rings 21 of the middle portion 2 have an open-loop structure, thereby improving the flexibility and throughput of the middle portion 2. The opening directions of the S-shaped connectors 22 at both ends of the waveform support rings 21 are opposite, which can make the force more uniform during pushing.

[0109] When the middle part 2 expands, as shown in Figure 6, the peaks 23 and troughs 24 of the waveform support ring 21 form a small rotational misalignment. The rotational misalignment angle is less than 1 / 2 of the central angle corresponding to the wavelength of the waveform support ring 21.

[0110] In this embodiment, as shown in FIG7, the S-shaped connector 22 is provided with a support portion 221. The support portion 221 is located on the belly of the S-shaped connector 22. When the middle part 2 is not expanded, as shown in FIG12, the support portion 221 abuts against two adjacent wave peaks 23 of the left wave support ring 21 and two adjacent wave troughs 24 of the right wave support ring 21, which can additionally form two sets of pushing force transmission channels. The upper end and lower end of the S-shaped connector 22 abut against the adjacent S-shaped connector 22, which also form one set of pushing force transmission channels. In this way, each S-shaped connector forms a total of three additional pushing force transmission channels, which not only makes the axial force of the middle part 2 more uniform, but also disperses the force between the S-shaped connectors 22, making the force of the S-shaped connector 22 more uniform in the circumferential direction, and further improving the bending resistance of the middle part 2.

[0111] It should be noted that the number of propulsion transmission channels in the above embodiments is only described in conjunction with some of the embodiments. Obviously, according to the inventive concept of this application, other numbers of propulsion transmission channels can be formed.

[0112] This invention, due to the multiple sets of pushing force transmission channels in a single S-shaped connector, provides several times more pushing force transmission channels than existing technologies while maintaining the overall flexibility of the stent. This allows the pushing force to be evenly transmitted between the support rings during stent delivery, successfully reducing the potential risk of stent deformation caused by excessive local pushing force and significantly improving the stent's delivery performance in microcatheters. Furthermore, while maintaining consistent delivery performance within the microcatheter, the number of connectors can be relatively reduced, and the stent exhibits better flexibility under compression, further improving its bending performance in both compressed and expanded states. This innovative design significantly improves stent delivery during surgery, balancing and optimizing the pushing force transmission and stent flexibility of existing intracranial vascular stents under compression.

[0113] It should be noted that the vascular stent of the present invention can be used in various application scenarios that require minimally invasive interventional surgery, and is not limited to intracranial applications.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vascular stent, characterized in that, The stent includes multiple wave-shaped support rings arranged sequentially along the axial direction of the vascular stent. An S-shaped connector is provided between adjacent wave-shaped support rings. The two ends of the S-shaped connector are respectively connected to the crest and trough of the two wave-shaped support rings adjacent to the S-shaped connector. The S-shaped connector has a support portion. When the vascular stent is compressed, the support portion abuts against the crest and / or trough of the wave-shaped support ring.

2. The vascular stent according to claim 1, characterized in that, The support portion is located at the part of the S-shaped connector that protrudes towards the waveform support ring.

3. The vascular stent according to claim 2, characterized in that, The support portion is the curved portion of the S-shaped connector that protrudes toward the waveform support ring adjacent to the S-shaped connector.

4. The vascular stent according to any one of claims 1 to 3, characterized in that, The S-shaped connectors are spaced apart in the circumferential direction of the vascular stent.

5. The vascular stent according to claim 4, characterized in that, The S-shaped connectors are arranged in a circular array around the axis of the waveform support ring.

6. The vascular stent according to any one of claims 1 to 5, characterized in that, The S-shaped connector has two support portions. When the vascular stent is compressed, the two support portions respectively abut against the crest and trough of the adjacent waveform support ring.

7. The vascular stent according to claim 6, characterized in that, The number of wave crests or troughs that abut against each of the support portions is greater than or equal to two.

8. The vascular stent according to claim 7, characterized in that, When the vascular stent is compressed, the two support parts abut against the two peaks of the adjacent waveform support ring on one side and the two troughs of the adjacent waveform support ring on the other side, so as to form two additional sets of push force transmission channels at each S-shaped connector.

9. The vascular stent according to any one of claims 1 to 8, characterized in that, The S-shaped connectors located on the same circumference have the same opening direction.

10. The vascular stent according to any one of claims 1 to 9, characterized in that, On the same circumference, the S-shaped connector is distributed along the waveform support ring adjacent to the S-shaped connector at intervals of two wave peaks or wave troughs.

11. The vascular stent according to any one of claims 1 to 10, characterized in that, When the multiple wave-shaped support rings arranged sequentially along the axial direction of the vascular stent are fully extended, the misalignment distance between the wave crest and the wave trough connected by the S-shaped connector in the circumferential direction of the vascular stent is less than 1 / 2 of the wavelength of the wave-shaped support ring.

12. The vascular stent according to any one of claims 1 to 11, characterized in that, The S-shaped connectors located on both sides of the same waveform support ring have opposite opening directions.

13. The vascular stent according to any one of claims 1 to 12, characterized in that, The S-shaped connectors located on both sides of the same waveform support ring are offset along the circumferential direction of the waveform support ring.

14. The vascular stent according to any one of claims 1 to 13, characterized in that, The support portion is located on the belly of the S-shaped connector.

15. The vascular stent according to any one of claims 1 to 14, characterized in that, Along the axial direction of the vascular stent, the minimum distance between the support portion and the adjacent waveform support ring is D1, and the distance between the waveform support rings on both sides of the support portion is D2. When the waveform support ring does not expand, D1≤0.2D2.

16. The vascular stent according to any one of claims 1 to 15, characterized in that, When the vascular stent is compressed, the distance between the support portion and the adjacent waveform support ring is zero.

17. The vascular stent according to claim 16, characterized in that, When the vascular stent is compressed, the support portion abuts against the crest or trough of the adjacent waveform support ring.

18. The vascular stent according to claims 1 to 17, characterized in that, When the vascular stent is compressed, the upper and / or lower ends of the S-shaped connector abut against the S-shaped connector adjacent to the circumferentially connected to the wave-shaped support ring.

19. The vascular stent according to any one of claims 1 to 18, characterized in that, Multiple wave-shaped support rings arranged axially form the middle section.

20. The vascular stent according to claim 19, characterized in that, The end of the S-shaped connector that connects to the crest is the lower end of the S-shaped connector, and the end of the S-shaped connector that connects to the trough is the upper end of the S-shaped connector. When the vascular stent is compressed, the lower end of the S-shaped connector does not extend beyond the crest connected to the lower end of the S-shaped connector in the circumferential direction of the middle part, and the upper end of the S-shaped connector extends beyond the trough connected to the upper end of the S-shaped connector in the circumferential direction of the middle part.

21. The vascular stent according to claim 19 or 20, characterized in that, The vascular stent also includes an end portion, which is connected to the end of the intermediate portion.

22. The vascular stent according to claim 21, characterized in that, The diameter of the end portion on the side away from the middle portion is greater than the diameter of the connection between the end portion and the middle portion.

23. The vascular stent according to claim 21 or 22, characterized in that, The end portion includes a first end and a second end, and the middle portion connects the first end and the second end. The first end adopts a closed-loop structure, including two waveform support rings arranged along the axial direction of the vascular stent, wherein the peak of one waveform support ring is opposite to the trough of the other waveform support ring and connected by a connector to form the closed-loop structure. The second end adopts an open-loop structure, including a waveform support ring.

24. The vascular stent according to claim 23, characterized in that, The first end is connected to the middle part via the S-shaped connector and / or the straight connector.

25. The vascular stent according to claim 23 or 24, characterized in that, The second end is connected to the middle part via the S-shaped connector and / or the straight connector.

26. A vascular stent according to any one of claims 19 to 25, characterized in that, When the middle part expands, the peaks and troughs of the adjacent waveform support rings form a rotational misalignment, and the rotational misalignment angle is less than 1 / 2 of the central angle corresponding to the wavelength of the waveform support ring.

27. The vascular stent according to any one of claims 1 to 8, characterized in that, The S-shaped connectors are provided in multiple ways along the circumferential direction of the waveform support ring.

28. The vascular stent according to claim 27, characterized in that, The number of S-shaped connectors is three along the circumferential direction of each of the waveform support rings.

29. A vascular stent, characterized in that, The stent includes a middle section and an end section, with the end section connected to both ends of the middle section. The middle section includes a plurality of wave-shaped support rings arranged along the axial direction of the vascular stent. An S-shaped connector is provided between adjacent wave-shaped support rings. The two ends of the S-shaped connector are respectively connected to the crest and trough of the adjacent wave-shaped support ring. The S-shaped connector is provided with a support portion, which is used to abut against the crest and / or trough of the wave-shaped support ring when the vascular stent is compressed.

30. The vascular stent according to claim 29, characterized in that, The S-shaped connectors are spaced apart on the circumference of the waveform support ring, and are arranged in a circular array around the axis of the waveform support ring.

31. The vascular stent according to claim 29 or 30, characterized in that, The S-shaped connectors located on both sides of the same waveform support ring have opposite opening directions.

32. The vascular stent according to any one of claims 29 to 31, characterized in that, The support portion is located on the belly of the S-shaped connector.

33. The vascular stent according to any one of claims 29 to 32, characterized in that, Along the axial direction of the vascular stent, the minimum distance between the support portion and the adjacent waveform support ring is D1, and the distance between the waveform support rings on both sides of the support portion is D2. When the waveform support ring does not expand, D1≤0.2D2.

34. The vascular stent according to claim 33, characterized in that, When the vascular stent is compressed, the distance between the support portion and the adjacent waveform support ring is zero.

35. The vascular stent according to claim 34, characterized in that, When the vascular stent is compressed, the support portion abuts against the crest or trough of the adjacent waveform support ring.

36. The vascular stent according to claim 35, characterized in that, When the vascular stent is compressed, the number of peaks or troughs that abut against the same support portion is greater than or equal to two.

37. The vascular stent according to claim 35 or 36, characterized in that, When the vascular stent is compressed, the upper and / or lower ends of the S-shaped connector abut against the adjacent S-shaped connector in the circumferential direction of the waveform support ring.

38. The vascular stent according to any one of claims 29 to 37, characterized in that, The outer diameter of the end portion is greater than the diameter at the junction of the end portion and the middle portion.

39. The vascular stent according to any one of claims 29 to 38, characterized in that, When the middle part is fully expanded, the misalignment distance between the peaks and troughs connected by the S-shaped connector in the circumferential direction of the vascular stent is less than 1 / 2 of the wavelength of the waveform support ring.

40. A method for pushing a vascular stent, characterized in that, The vascular stent is a vascular stent according to any one of claims 1 to 39, comprising the following steps: The vascular stent is pressed into the lumen of the microcatheter. When the vascular stent is compressed, the support portion abuts against the crest and / or trough of the waveform support ring to form at least one additional set of push force transmission channels at each S-shaped connector. When the vascular stent is released from the lumen of the microcatheter, the waveform support ring expands radially.

41. A connection structure for a vascular stent, used for connecting adjacent corrugated support rings of the vascular stent, characterized in that, The connection structure is an S-shaped connector with a support portion. When the vascular stent is compressed, the support portion is used to abut against the crests and / or troughs of the waveform support ring.

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