CN215778371U - Stent for a blood flow directing stent system - Google Patents

Abstract

The utility model provides a bracket for a blood flow guiding bracket system, which relates to the technical field of medical instruments and comprises a keel bracket and a dense mesh bracket which are sequentially sleeved from outside to inside; the dense net support comprises a dense net body and hook-shaped structures which are arranged on the dense net body and correspond to partial meshes of the grid after the keel support is unfolded, and the hook-shaped structures are used for fixing the dense net support at different positions relative to the keel support before the dense net support is completely released. The technical problems that the dense-net stent blocks branches and is not easy to accurately position the aneurysm are solved, and the technical effect that the dense-net stent can be integrally positioned in the releasing process is achieved.

Description

Stent for a blood flow directing stent system

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a stent for a blood flow guiding stent system.

Background

Intracranial aneurysms, a common and highly lethal and disabling cerebrovascular disease, are widely believed to be caused by local vascular abnormalities leading to the formation of a neoplastic-like protrusion under the impact of blood flow. The mortality rate of ruptured intracranial aneurysms can be as high as 50%.

Conventional aneurysm treatment methods include: 1. clamping aneurysm in surgical operation, and clamping the neck of the aneurysm with a metal clamp in craniotomy; because of the high risk and high risk of surgical operation, the main treatment is minimally invasive intervention. 2. Endovascular interventions, embolizing aneurysms with detachable coils (or micro-wire coils or other embolizing materials, such as detachable balloons, curable liquids, etc.); the micro-spring coil intervention procedure can reach aneurysmal lesions of tortuous complex cerebral arteries and stop the blood flow from impinging by the packing of the tumor lumen, however this packing risks enlarging the aneurysm from rupturing and has a space-occupying effect compressing the nearby blood vessels. 3. Endovascular interventional therapy stents such as: the dense mesh woven stent can pass through a tortuous and slender cerebral blood vessel to reach a target lesion and conform to the tortuous blood vessel to keep a blood vessel lumen channel. The stent has a high density of mesh openings that can significantly alter the flow of blood within the aneurysm such that it is retained to form blood clots and organized solids. However, when the blood flow guiding device is used for treating the aneurysm, branch occlusion is easily caused, the aneurysm has the risk of delayed rupture, the cure period is long, and meanwhile, if the aneurysm is a jet disease, the metal coverage rate of the blood flow guiding device is further reduced, so that the treatment effect is influenced; 4. the requirement of the covered stent for treating the aneurysm on the condition of the blood vessel is severe, if branches exist, the branches are blocked, and the covered stent has poor compliance, so that inaccurate positioning is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a stent for a blood flow guiding stent system, which solves the technical problems that a dense mesh stent occludes branches and is difficult to accurately position with an aneurysm in the prior art.

The present invention provides a stent for a blood flow directing stent system comprising: the keel bracket and the dense net bracket are sleeved in sequence from outside to inside;

the dense net support comprises a dense net body and hook structures which are arranged on the dense net body and correspond to partial meshes of the grid after the keel support is unfolded, and the hook structures are used for fixing the dense net support at different positions relative to the keel support before the dense net support is completely released.

Further, the length of the expanded dense net body is matched with the length of the grid of the expanded keel support and is n times of the length of the grid, wherein n is a natural number.

Furthermore, the hook-shaped structures are arranged at two ends of the dense net bracket;

and/or the hook-shaped structures are arranged at the annular periphery of the dense mesh support corresponding to the grid of the expanded keel support.

Furthermore, the grid vertex of the keel bracket and the hook-shaped structure are developed under rays.

Further, the developing treatment comprises winding and coating the developing material under the ray.

Furthermore, the dense mesh support is of a mesh tubular structure formed by staggered weaving;

the dense mesh support comprises a developing wire, and the metal coverage rate of the dense mesh support is 35% -45%.

Furthermore, the dense mesh support is formed by weaving wires and more than a plurality of developing wires.

Furthermore, the knitting silk is knitted to form rhombic meshes, and the density of the rhombic meshes is uniform.

Further, the braided wires are one or more of nickel-titanium alloy wires, stainless steel wires and cobalt-based alloy wires;

the developing wire is one or more of platinum group metal, rhenium, tungsten, tantalum, gold or silver.

Further, the diameter of the expanded dense-net stent is unchanged;

the sections of the near end and the far end of the dense mesh bracket are both vertical to the axis of the dense mesh bracket.

Has the advantages that:

the utility model provides a bracket for a blood flow guiding bracket system, which comprises a keel bracket and a dense mesh bracket which are sequentially sleeved from outside to inside; the dense mesh support comprises a dense mesh body and a hook-shaped structure arranged on the dense mesh body, and the hook-shaped structure can enable the dense mesh support to be fixed at different positions relative to the keel support before the dense mesh support is completely released, so that the far end of the dense mesh support released firstly can be hooked on the keel support through the hook-shaped structure, the far end of the dense mesh support is fixed relative to the keel support and can be completely unfolded after being fixed with the keel support, the relative position between the dense mesh support and the keel support cannot be changed, the aneurysm neck opening can be ensured to be basically at the preset position (such as the central position) of the dense mesh support, and then the dense mesh support can be released at the accurate position.

In addition, the hook-shaped structures correspond to partial meshes of the grid after the keel support is unfolded, so when a far-end fixing point of the keel support is selected, the fixing point can be well selected at the mesh of the grid, and the aneurysm neck opening is further ensured to be in the center of the dense-mesh support.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a stent for a blood flow guiding stent system according to an embodiment of the present invention;

FIG. 2 is a schematic view of a keel support for use in a stent of the blood flow directing stent system;

FIG. 3 is a schematic structural view of a dense mesh stent used in a stent of a blood flow directing stent system;

fig. 4 is a schematic diagram showing that the length of the expanded dense-net body is matched with the length of the grid of the expanded keel support.

Icon:

100-keel bracket;

200-dense net support; 210-dense network body; 220-hook configuration.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the utility model are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 to 3, the present embodiment provides a stent for a blood flow guiding stent system, the stent including: the keel bracket 100 and the dense mesh bracket 200 are sleeved in sequence from outside to inside; the dense mesh bracket 200 is provided with hook structures 220 matched with the expanded grids of the keel bracket 100, and the hook structures 220 are used for fixing the dense mesh bracket 200 at different positions relative to the keel bracket 100 before the dense mesh bracket is completely released.

According to the stent for the blood flow guiding stent system, the distal end of the dense mesh stent 200 released firstly can be hooked on the keel stent 100 through the hook-shaped structure 220, so that the distal end of the dense mesh stent 200 is fixed relative to the keel stent 100 and can be completely unfolded after being fixed with the keel stent 100, the relative position between the two cannot be changed, the aneurysm neck opening can be ensured to be basically at the preset position (such as the central position) of the dense mesh stent 200, and then the stent can be released at the accurate position.

In addition, because the dense mesh stent 200 is provided with the hook-shaped structures 220 matched with the grids of the expanded keel stent 100, the distal end of the dense mesh stent 200 can be selectively released and fixed at different positions relative to the keel stent 100 in a hooking mode before release, so as to accurately adjust and position and seal the aneurysm.

In addition, because the hook-shaped structures 220 correspond to partial meshes of the grid after the keel support 100 is unfolded, when the far-end fixing points of the keel support 100 are selected, the fixing points can be well selected at the meshes of the grid, and the neck of the aneurysm is further ensured to be in the center of the dense-net support 200.

Specifically, the keel support 100 and the dense mesh support 200 are connected in a sleeved mode through a structure that the keel support 100 is arranged outside the dense mesh support 200, and the inner diameter of the keel support 100 is slightly larger than the outer diameter of the dense mesh support 200.

It should be noted that the diameter of the keel support 100 is larger than that of the dense mesh support 200, the mesh of the dense mesh body 210 is dense than that of the keel support 100, the keel support 100 and the dense mesh support 200 are sequentially sleeved from outside to inside, so that the blood flow in the aneurysm can be changed to be retained to form blood clots and body solids, and the meshes of the keel support 100 outside the two ends of the dense mesh body 210 are sparse, so that blood can smoothly pass through the branch artery, and the risk of blocking the branch artery to cause complications is avoided.

The keel support 100 with larger aperture is designed on the outer side of the dense mesh support 200, so that the contact area between the support and the microcatheter is reduced, and the pushing resistance is reduced; the sleeve and the fixed mandrel are matched with the pushing support, so that the loss of pushing force is reduced, and meanwhile, the support is firmly held and cannot be separated when the support system releases the switch in a closed state, so that the support can be completely recovered and re-implanted in the implantation process, the fault-tolerant rate in the operation process is increased, and the operation difficulty of implantation of the single-layer dense-mesh support is effectively reduced.

Optionally, the keel support 100 may have a wire diameter of 0.01mm to 1mm, illustratively, the keel support 100 has a wire diameter of 0.01mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0 mm. The wire diameter of the dense mesh stent 200 may be 0.01 to 0.8mm, and illustratively, the wire diameter of the dense mesh stent 200 is 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, or 0.8 mm.

Referring to fig. 1 and 4, the expanded length of the dense mesh body 210 is matched with the expanded mesh length of the keel support 100, which is n times of the mesh length, wherein n is a natural number, so that when the dense mesh support 200 is fixed at different positions relative to the keel support 100, the positions of the hook structures 220 of the dense mesh support 200 can correspond to partial meshes of the mesh, and the fixed points can be selected at the positions of the meshes to assist a doctor in selecting a far-end positioning point.

Illustratively, n can be 2, 3, 4, 5, and above.

In this embodiment, the hook-shaped structure 220 may take various forms, and it is within the scope of the present invention to satisfy the different fixing positions of the dense mesh stent 200 relative to the keel stent 100.

The concrete structure can comprise the following three structural forms:

(1) the hook structures 220 are disposed at both ends of the dense mesh stent 200.

(2) The hook structures 220 are disposed at the circumferential outer peripheries of the dense mesh stent 200 corresponding to the expanded lattice of the keel stent 100.

(3) The hook structures 220 are disposed at both ends of the dense mesh stent 200, and also some of the hook structures 220 are disposed at the circumferential outer peripheries of the dense mesh stent 200 corresponding to the expanded lattice of the keel stent 100 (see fig. 3 in detail).

It should be noted that the hook formations 220 at both ends serve the primary fixation function, with the distal end released first being hooked onto the keel support 100 by means of the distal hook formations 220, thereby securing the distal end relative to the keel support 100, and the distal hook formations 220 being used to selectively locate accurately relative to the aneurysm neck (to align the release position); the hook-shaped structures 220 positioned at the periphery of the middle play a role in assisting in fixing, and because the expanded length of the dense mesh body 210 is matched with the expanded mesh length of the keel support 100, the hook-shaped structures 220 positioned at the periphery of the middle can face the expanded mesh of the keel support 100, so that the hook-shaped structures can still be hooked in the corresponding mesh on the premise of conforming to the length change of the dense mesh support 200 during release, and play a role in assisting in fixing firmly.

Wherein, upon release, the distally located hook-like structure 220 is adapted to be selectively accurately positioned relative to the aneurysm neck (to find the release position).

It should be noted that "proximal" refers to a direction close to the release handle in the use state; "distal" refers to the end opposite the proximal end.

In this embodiment, the grid vertices and the hook-like structures 220 of the keel support 100 are developed under radiation. The developing process under the radiation is a conventional technique in the art, and is not improved in this embodiment, and is not described in detail here.

Specifically, the development process includes winding, coating, and developing the material under radiation.

On the basis of the above embodiment, the dense mesh stent 200 is a mesh tubular structure formed by interlacing weaving; the dense mesh stent 200 comprises a developing wire, and the metal coverage rate of the developing wire is 35% -45%.

Illustratively, the metal coverage may be 35%, 40%, or 45%.

In this embodiment, the dense mesh stent 200 is woven by using a weaving yarn and a plurality of developing yarns.

Specifically, 2, 4, 6 or 8 developing filaments may be used.

Furthermore, the weaving silk is woven to form rhombic meshes, and the density of the rhombic meshes is uniform.

Optionally, the braided wire is one or more of a nickel-titanium alloy wire, a stainless steel wire and a cobalt-based alloy wire; the developing wire is one or more of platinum group metal, rhenium, tungsten, tantalum, gold or silver.

When the knitting yarn or the developing yarn is a combination of a plurality of materials, the combination of materials can be obtained by the prior art in the field, and detailed description is omitted here.

In other embodiments, the keel frame 100 and the dense mesh frame 200 are made of the same or different alloy with memory function, or metal with high elasticity, or polymer material with high elasticity, and the alloy and the metal include: stainless steel, platinum-tungsten alloy, platinum-iridium alloy, nickel-titanium alloy, or cobalt-chromium alloy; the polymer material includes: polyethylene, polyoxymethylene, polyurethane, polyester, polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polyamide, polyimide or nylon.

Further, the stent of the present embodiment is self-expandable, and the two ends of the keel stent 100 are in a trumpet-shaped structure protruding and extending beyond the dense-mesh stent 200, which is helpful for improving the anchoring performance of the stent and preventing displacement or shortening.

The self-expanding effect is embodied in that, when the stent system is delivered by the delivery mechanism in the prior art, the stent system is constrained in the microcatheter in a crimped state, and the tip end is held by the release handle; as long as the stent is released, the stent maintains a crimped state when pushed or withdrawn by the release handle, and the outer diameter of the stent in the crimped state is equal to the inner diameter of the microcatheter. When the stent is directly pushed out of the microcatheter, the radial clamping force provided by the inner wall of the microcatheter disappears, the stent can automatically expand, and the outer diameter of the stent is adaptive to the wall of a blood vessel. In this process, crimping and self-expansion of the keel support 100 and the dense mesh support 200 occur simultaneously. The flared configuration of the sides of the keel support 100 provides further anchoring of the support.

In this embodiment, referring to fig. 1 or fig. 2, the expanded diameter of the dense mesh stent 200 is unchanged; the sections of the proximal and distal ends of the dense mesh stent 200 are perpendicular to the axis of the dense mesh stent 200.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A stent for a blood flow directing stent system, comprising: the keel bracket (100) and the dense net bracket (200) are sleeved in sequence from outside to inside;

the dense mesh support (200) comprises a dense mesh body (210) and hook structures (220) which are arranged on the dense mesh body (210) and correspond to partial meshes of the grid after the keel support (100) is unfolded, and the hook structures (220) are used for fixing the dense mesh support (200) at different positions relative to the keel support (100) before the dense mesh support is completely released.

2. The stent for a blood flow guiding stent system as claimed in claim 1, wherein the expanded length of the dense mesh body (210) matches the expanded mesh length of the keel stent (100) by n times the mesh length, wherein n is a natural number.

3. The stent for a blood flow directing stent system according to claim 1, wherein the hook structures (220) are provided at both ends of the dense mesh stent (200);

and/or the hook structures (220) are arranged at the annular periphery of the dense mesh support (200) corresponding to the expanded grid of the keel support (100).

4. The stent for a blood flow directing stent system as claimed in any one of claims 1-3, wherein the grid vertices of the keel stent (100) and the hook-like structures (220) are processed using an under-ray visualization.

5. The stent for a blood flow directing stent system according to claim 4, wherein: the developing treatment comprises winding and coating of the developing material under the rays.

6. The stent for a blood flow directing stent system as set forth in claim 1, wherein the dense mesh stent (200) is a mesh tubular structure woven in a staggered pattern;

the dense mesh support (200) comprises a developing wire, and the metal coverage rate of the developing wire is 35% -45%.

7. The stent for a blood flow directing stent system according to claim 6 wherein: the dense-net support (200) is formed by weaving wires and more than a plurality of developing wires.

8. The stent for a blood flow directing stent system according to claim 7, wherein: the knitting silk is knitted to form rhombic meshes, and the density of the rhombic meshes is uniform.

9. The stent for a blood flow directing stent system according to claim 7, wherein: the braided wires are one or more of nickel-titanium alloy wires, stainless steel wires and cobalt-based alloy wires;

the developing wire is one or more of platinum group metal, rhenium, tungsten, tantalum, gold or silver.

10. The stent for a blood flow directing stent system as claimed in any one of claims 1-3, 6-9, wherein: the diameter of the expanded dense mesh stent (200) is unchanged;

the sections of the near end and the far end of the dense mesh bracket (200) are vertical to the axis of the dense mesh bracket (200).

Images