Stent suitable for tortuous carotid artery

Abstract

The utility model provides a stent suitable for tortuous carotid artery, and relates to the technical field of carotid artery stents. The stent suitable for the tortuous carotid artery comprises a plurality of annular stent units connected in sequence, and each annular stent unit comprises a stent rod and a plurality of rotatable toggle mechanism units distributed on the stent rod; every two adjacent annular support units are connected through a plurality of rotatable toggle mechanism units. The stent suitable for the tortuous carotid artery can be freely deformed in a tortuous blood vessel according to the bending degree of the blood vessel, and better adherence and compliance of the carotid artery stent in the tortuous blood vessel are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of carotid artery stents, in particular to a stent suitable for tortuous carotid arteries. Background Art

[0002] Carotid artery stent implantation is to insert a vascular stent into the carotid artery stenosis so that the blood vessel can maintain its original expansion state. The ideal carotid artery stent should have both compliance and sufficient support in terms of mechanical properties to adapt to the tortuous vascular anatomical structure.

[0003] The main body of the stent is generally a sequentially arranged annular structure. According to the arrangement density of the inter-ring structure, the existing stents can be divided into open-loop stents and closed-loop stents. Among them, the open-loop stent can better adapt to the anatomical structure of the blood vessels, has good compliance, can still perfectly adhere to the wall of tortuous blood vessels, and also has many advantages such as strong radial support and difficult displacement after release.

[0004] However, although the traditional open-loop stent has good mechanical properties and structural advantages, it will be subjected to the tensile stress of the material itself at the location with a large bending radius in the curved blood vessel, and will be subjected to the compressive stress at the location with a small bending radius, which will lead to a large difference in the radial support force output by the stent at the curved position, and will also cause it to have poor wall adhesion when acting in the tortuous blood vessel. In addition, long-term uneven force will also reduce the fatigue resistance of the stent. Therefore, it is urgent to propose a stent suitable for the tortuous carotid artery to solve one or more of the above problems. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art, the utility model provides a stent adapted to a tortuous carotid artery, solving the problem of poor wall adhesion and compliance of the carotid artery stent in a tortuous blood vessel.

[0007] (II) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A stent adapted for a tortuous carotid artery, the stent comprising:

[0010] A plurality of annular support units are connected in sequence; each of the annular support units comprises a support rod and a plurality of rotatable toggle mechanism units distributed on the support rod; and each two adjacent annular support units are connected via a plurality of the rotatable toggle mechanism units.

[0011] Preferably, the support rod comprises a plurality of sine wave structure supports connected end to end.

[0012] Preferably, a plurality of rotatable toggle mechanism units are distributed at the trough positions of the sinusoidal wave structure support.

[0013] Preferably, the plurality of disc-shaped toggle mechanism units on two adjacent annular support units are arranged in parallel.

[0014] Preferably, the plurality of disc-shaped toggle mechanism units on two adjacent annular support units are arranged orthogonally.

[0015] Preferably, the rotatable toggle mechanism unit is a disc-type toggle mechanism unit, and the disc-type toggle mechanism unit comprises: an toggle disc, and an toggle shoe rotatably connected to the toggle disc.

[0016] Preferably, the disc-type toggle mechanism unit further comprises: a filling structure located on the toggle disc.

[0017] Preferably, the number of the sinusoidal wave structure supports is 4.

[0018] Preferably, the filling structure is a groove and / or a micropore.

[0019] (III) Beneficial effects

[0020] The utility model provides a stent suitable for tortuous carotid arteries. Compared with the prior art, it has the following beneficial effects:

[0021] The utility model proposes a stent suitable for tortuous carotid arteries, which comprises: a plurality of annular stent units connected in sequence, the annular stent units comprising a stent rod and a plurality of rotatable elbow mechanism units distributed on the stent rod; and each two adjacent annular stent units are connected by a plurality of rotatable elbow mechanism units. The stent suitable for tortuous carotid arteries proposed by the utility model can be freely deformed according to the degree of curvature of the blood vessel when the stent is implanted in the tortuous blood vessel, thereby ensuring better wall adhesion and compliance of the carotid artery stent in the tortuous blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the bracket in Example 1 of the utility model;

[0024] Figure 2 This is a schematic structural diagram of a disc-type toggle mechanism unit in Embodiment 1 of the present utility model;

[0025] Figure 3 This is a schematic structural diagram of the annular bracket unit in Example 1 of the utility model;

[0026] Figure 4 It is a plan view of the connection and assembly of two adjacent annular bracket units in Example 1 of the utility model;

[0027] Figure 5 A three-dimensional diagram of the connection and assembly of two adjacent annular bracket units in Example 1 of the utility model;

[0028] Figure 6 This is a planar expansion diagram of the bracket in Example 1 of the utility model;

[0029] Figure 7 It is a plan view of the bracket in Example 1 of the utility model from different viewing angles;

[0030] Figure 8 A schematic diagram of the stent in Example 1 of the utility model being bent to adapt to the tortuous carotid artery;

[0031] Fig. 9 It is a plan view of the connection and assembly of two adjacent annular bracket units in Example 2 of the utility model;

[0032] Fig.10 A three-dimensional diagram of the connection and assembly of two adjacent annular bracket units in Example 2 of the utility model;

[0033] Fig.11 This is a schematic diagram of the structure of the bracket in Example 2 of the utility model;

[0034] Fig.12 This is a planar expansion diagram of the bracket in Example 2 of the utility model;

[0035] Fig.13 It is a plan view of the bracket in Example 2 of the utility model from different viewing angles;

[0036] Fig.14 A schematic diagram of the stent in Example 2 of the utility model being bent to adapt to the tortuous carotid artery;

[0037] In the figure: 1-annular support unit; 11-support rod; 12-rotatable elbow joint mechanism unit; 121-elbow plate; 122-elbow tile; 123-filling structure. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] The embodiment of the present application solves the problem of poor wall adhesion and compliance of the carotid artery stent in tortuous blood vessels by providing a stent suitable for tortuous carotid arteries, thereby achieving simultaneous optimization of mechanical properties such as stent compliance, wall adhesion, uniform radial support force, and uniform stent deployment.

[0040] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0041] In order to ensure better wall adhesion and compliance of the carotid stent in tortuous blood vessels, the stent suitable for tortuous carotid arteries proposed in this application is designed with a tiny rotatable elbow mechanism unit at the corresponding node on the basis of the open-loop structure stent, so as to ensure that the stent can be freely deformed according to the degree of blood vessel curvature when implanted in tortuous blood vessels. Relying on the rotation of the tiny elbow mechanism unit, the stent can achieve large-angle rotation in the plane and space range, and the rotation deformation process will not produce tensile and compressive deformation behavior on the structural material of the stent body, ensuring that the overall force of the stent is uniform, improving the fatigue resistance of the stent when it is in action, and providing a good match between better wall adhesion, compliance and radial support force for the stent in the blood vessel.

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Embodiment 1:

[0044] This embodiment provides a stent suitable for tortuous carotid arteries. The stent is based on an open-loop structure stent and has a small movable connection portion at the corresponding node position, so as to ensure that the stent can be freely deformed according to the degree of curvature of the blood vessel when implanted in the tortuous blood vessel. Figure 1 The stent adapted for the tortuous carotid artery comprises:

[0045] A plurality of annular support units 1 are connected in sequence, each of which comprises a support rod 11 and a plurality of rotatable elbow joint mechanism units 12 distributed on the support rod 11; and each two adjacent annular support units 1 are connected via a plurality of the rotatable elbow joint mechanism units 12.

[0046] The rotatable toggle mechanism unit 12 is a disc-shaped toggle mechanism unit. Figure 2 As shown, in this embodiment, the disc-type toggle mechanism unit includes: an toggle disc 121, and an toggle shoe 122 rotatably connected to the toggle disc 121.

[0047] In order to make the stent better adapt to the elasticity of the tortuous carotid artery and provide a radial support force that is more adaptable to the blood vessel, a preferred method is that the stent rod 11 of each of the above-mentioned annular stent units 1 is a plurality of first-connected sinusoidal wave structure stents, and the rotatable toggle mechanism units 12 are distributed at the trough position of the sinusoidal wave structure stent, specifically as Figure 3 In this embodiment, more preferably, the number of the sine wave structure brackets is 4.

[0048] The present embodiment provides a stent adapted for a tortuous carotid artery. The stent can realize large-angle rotation in a plane and space by relying on the rotation of a plurality of tiny rotatable elbow mechanism units 12. In addition, the rotation deformation process will not cause stretching, compression deformation and the like to the structural material of the stent body, thereby ensuring uniform force on the whole stent, improving the fatigue resistance of the stent when in action, and providing the stent with better wall adhesion, compliance and radial support force in the blood vessel at the same time.

[0049] In addition, in order to further optimize the performance of the stent adapted to the tortuous carotid artery and enrich its functions, a filling structure 123 is provided on the circular elbow disc 121 of the disc-shaped elbow mechanism, and the filling structure 123 is used to fill drugs, developing substances, etc. For example, rapamycin drugs are filled to inhibit the restenosis problem caused by intimal hyperplasia; or BaSO4, metal tantalum particles, etc. are filled to mark special positions of the stent to enhance the developing effect of the stent. Preferably, the filling structure 123 is a groove and / or micropore, specifically as shown in FIG. Figure 2 shown.

[0050] In specific applications, the multiple disc-shaped elbow mechanism units on the two adjacent annular stent units 1 that constitute the stent suitable for tortuous carotid arteries in this embodiment can be designed as different unit arrangement types, thereby obtaining an open-loop carotid artery stent with different unit arrangement types, thereby satisfying the requirements that the stent has good compliance and wall adhesion while also having excellent mechanical properties such as uniform radial support force and uniform stent deployment.

[0051] In this embodiment, the multiple disc-shaped toggle mechanism units on the two annular support units 1 are arranged in parallel, specifically:

[0052] See also Figure 4 and Figure 5 , Figure 4It is a schematic plan view of two adjacent annular support units 1 being connected and assembled through parallel arranged disc-shaped toggle mechanism units. Figure 5 for Figure 4 The corresponding three-dimensional diagram. Through the repeated assembly of the elbow plate 121 and the elbow shoe 122 of the disc-shaped elbow joint mechanism unit, a bracket with a certain length requirement (20-60mm) is formed. Specifically, the two disc-shaped elbow joint mechanism units on two adjacent annular bracket units 1 are arranged in parallel and connected. Among them, one ( Figure 5 The upper one in the middle) annular support unit 1 is provided with a toggle shoe 122 of a disc-type toggle mechanism unit at the trough position of its odd / even support rods 11, and the toggle plate 121 of the disc-type toggle mechanism unit is fixed directly above the toggle shoe 122 by extending the support (the upper and lower parts are connected by the bracket). Figure 5 The other ( Figure 5 The annular support unit 1 is provided with a toggle plate 121 of a disc-shaped toggle mechanism unit at the trough position of the odd / even number of support rods 11, and the toggle shoe 122 of the disc-shaped toggle mechanism unit is fixed directly below the toggle plate 121 by extending the support (the upper and lower parts are connected by the bracket). Figure 5 The perspective is taken as a reference). A plurality of the above-mentioned annular stent units 1 are connected in pairs in sequence through the above-mentioned connection relationship to form a stent suitable for the tortuous carotid artery in which the disc-shaped toggle mechanism units proposed in this embodiment are arranged in parallel. Figure 1 As shown, a three-dimensional structure diagram of a stent adapted to a tortuous carotid artery is formed by a plurality of parallel arranged disc-shaped toggle mechanism units. The open-loop annular stent unit 1 can be rotated and deformed within a plane along the disc-shaped toggle mechanism within a range of -30° to +30°, so that the annular stent unit 1 satisfies the stent's better wall adhesion in the tortuous blood vessel and ensures uniform lumen structure at the same time. Figure 6 The figure is an expanded view of the stent adapted for the tortuous carotid artery; Figure 7 are plan views of the bracket from different viewing angles, specifically, a, b, c, and d are the front view, left view, top view, and axonometric view of the bracket, respectively; Figure 8 Schematic diagram of the stent being bent to accommodate the tortuous carotid artery.

[0053] Of course, in actual operation, the end ( Figure 5 Since the annular support unit 1 at the bottom of the figure does not need to be connected to another annular support unit 1, the toggle shoe 122 does not need to be provided in the disc-type toggle mechanism unit, and can be directly designed as two toggle plates 121, such as Figure 5 shown.

[0054] The stent of the embodiment is suitable for the tortuous carotid artery. With the regulation of the stent structure after the rotation of the disc-shaped toggle mechanism unit, the stent can better adapt to the curved blood vessels and achieve good wall adhesion in the curved blood vessels. While adhering to the wall, the stent cell structure is uniformly stressed and deformed, providing more stable mechanical support. In addition, the stent rod 11 can better adapt to the elasticity of the blood vessels and provide a radial support force that is more suitable for the blood vessels.

[0055] Embodiment 2:

[0056] In another application scenario, the plurality of disc-shaped elbow mechanism units on two adjacent annular stent units 1 of the stent adapted for tortuous carotid arteries are arranged orthogonally.

[0057] Specifically, Fig. 9 and Fig.10 As shown: the two disc-shaped toggle mechanism units on two adjacent annular support units 1 are arranged orthogonally. Fig. 9 It is a plan view schematic diagram of two adjacent annular support units 1 being connected and assembled through orthogonally arranged disc-shaped toggle mechanism units; Fig.10 It is a three-dimensional structural diagram, and a three-dimensional structural diagram of two adjacent annular bracket units 1 connected and assembled through a disc-type toggle mechanism unit. Fig.10 The disc-type toggle mechanism unit is Figure 5 On this basis, after orthogonal rotation, a group of unit structures that can rotate in the vertical direction are added to realize the upgrade of the bracket's ability to adaptively deform from a plane range to a spatial range.

[0058] Among them, one ( Fig.10 The annular support unit 1 in the upper middle part has elbow pads 122 of a disc-type elbow joint mechanism unit arranged at the trough positions of its odd-numbered support rods 11, while the elbow discs 121 of the disc-type elbow joint mechanism unit are arranged at the trough positions of the even-numbered support rods 11. Fig.10 The middle one) of the annular stent unit 1 is provided with an elbow plate 121 of a disc-shaped elbow joint mechanism unit at the trough position of its odd-numbered stent rods 11, and an elbow shoe 122 of the disc-shaped elbow joint mechanism unit is provided at the trough position of the even-numbered stent rods 11. A plurality of annular stent units 1 are connected in pairs in sequence through the above connection relationship to form a stent suitable for tortuous carotid arteries in which the disc-shaped elbow joint mechanism units proposed in this embodiment are arranged orthogonally, as shown in the specific example Fig.11 As shown, Fig.11 A three-dimensional structural diagram of a stent adapted for tortuous carotid arteries, which is composed of a plurality of orthogonally arranged disc-shaped elbow mechanism units. Fig.11 Actually, Figure 1The three-dimensional structural diagram of the stent structure in which the middle annular stent unit 1 and the adjacent annular stent unit 1 are rotated 90° to form an alternating orthogonal array. This structure realizes the upgrade of the stent rotational deformation from plane to space, and enables the stent to better adapt to the tortuous blood vessel structure at various angles and positions, and the stent ribs between the open-loop units will not cause interference.

[0059] Fig.12 is an expanded view of the stent adapted for the tortuous carotid artery in this embodiment; Fig.13 are plan views of the bracket in different viewing angles in the embodiment, specifically, a, b, c, and d are the front view, left view, top view, and axonometric view of the bracket, respectively; Fig.14 This is a schematic diagram of the stent bending to adapt to the tortuous carotid artery in this embodiment. Fig.14 In the embodiment, the stent can achieve better deformation adaptability in complex and tortuous blood vessels by virtue of the orthogonally arranged disc-shaped elbow mechanism units. The first group (the upper group) of rotating structures can achieve left and right rotation within a range of ±30°, and the second group (the lower group) can achieve up and down rotation within a range of ±30°, and so on, alternating back and forth to achieve multi-directional and multi-angle deformation of the stent within a spatial range. The stent in this embodiment can achieve better wall adhesion of the stent in tortuous blood vessels while ensuring uniform stent cavity structure and uniform force, thereby improving the therapeutic effect and applicability of the stent.

[0060] Of course, in actual operation, the end ( Fig.10 Because the annular support unit 1 at the bottom of the figure does not need to be connected to another annular support unit 1, its disc-type toggle mechanism unit does not need to be provided with an toggle shoe 122, and is directly designed as two toggle plates 121, and the position of the toggle plates 121 does not need to be limited, as shown in the specific Fig.10 shown.

[0061] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0062] 1. The utility model proposes a stent suitable for tortuous carotid arteries, which includes: a plurality of annular stent units connected in sequence, the annular stent unit includes a stent rod and a plurality of rotatable elbow mechanism units distributed on the stent rod; and each two adjacent annular stent units are connected by a plurality of rotatable elbow mechanism units. The utility model proposes a stent suitable for tortuous carotid arteries, which can be freely deformed according to the degree of blood vessel curvature when the stent is implanted in a tortuous blood vessel, thereby ensuring better wall adhesion and compliance of the carotid artery stent in the tortuous blood vessel.

[0063] 2. The utility model proposes a stent suitable for tortuous carotid arteries. By relying on the rotation of a rotatable elbow mechanism unit (preferably a disc-type elbow mechanism), the stent can realize large-angle rotation in a plane and within a spatial range, and will not cause tensile and compressive deformation to the structural material of the stent body during the rotational deformation process, thereby ensuring that the overall force of the stent is uniform, improving the fatigue resistance of the stent during operation, and providing a good coordination between better wall adhesion, compliance and radial support force for the stent in the blood vessel.

[0064] 3. The utility model proposes a stent suitable for tortuous carotid arteries. The rotatable elbow mechanism unit can be designed into a parallel or orthogonal unit arrangement type according to actual needs, so that the stent can achieve multi-directional and multi-angle deformation in a plane or even in space. While satisfying the requirements of good compliance and wall adhesion of the stent, it also has excellent mechanical properties such as uniform radial support force and uniform stent deployment.

[0065] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stent adapted for a tortuous carotid artery, characterized in that: The support comprises: A plurality of annular support units (1) are connected in sequence; each of the annular support units (1) comprises a support rod (11) and a plurality of rotatable toggle mechanism units (12) distributed on the support rod (11); and each two adjacent annular support units (1) are connected via the plurality of rotatable toggle mechanism units (12).

2. The bracket according to claim 1, characterized in that The support rod (11) comprises a plurality of sine wave structure supports connected end to end.

3. The bracket according to claim 2, characterized in that A plurality of rotatable toggle mechanism units (12) are distributed at the wave trough positions of the sinusoidal wave structural support.

4. The bracket according to claim 3, characterized in that: The plurality of rotatable toggle mechanism units (12) on two adjacent annular support units (1) are arranged in parallel.

5. The bracket according to claim 3, characterized in that: The plurality of rotatable toggle mechanism units (12) on two adjacent annular support units (1) are arranged orthogonally.

6. The bracket according to claim 4 or 5, characterized in that: The rotatable toggle mechanism unit (12) is a disc-type toggle mechanism unit, and the disc-type toggle mechanism unit comprises: an toggle plate (121), and an toggle shoe (122) rotatably connected to the toggle plate (121).

7. The bracket according to claim 6, characterized in that The disc-shaped toggle mechanism unit further comprises: a filling structure (123) located on the toggle disc (121).

8. The bracket according to claim 3, characterized in that: The number of the sinusoidal wave structure brackets is 4.

9. The bracket according to claim 7, characterized in that: The filling structure (123) is a groove and / or a micropore.

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