Stent suitable for vascular bifurcation

Abstract

The utility model provides a stent suitable for blood vessel bifurcation, which comprises a straight tube stent and a horn stent, the horn stent comprises a horn upper ring, a horn lower ring and a horn body, and the horn upper ring is provided with a highest point and a lowest point; the horn lower ring is connected with the straight pipe upper ring of the straight pipe support, the lowest point of the horn upper ring coincides with the horn lower ring in an overlook angle, and the highest point of the horn upper ring is located on the outer side of the horn lower ring; the trumpet body is connected between the trumpet upper ring and the trumpet lower ring, the trumpet stent can adapt to the anatomical structure of the blood vessel bifurcation through the beveled opening and trumpet-shaped design, the blood vessel bifurcation is supported, unnecessary occupying of a blood vessel trunk is avoided, it is guaranteed that blood of the blood vessel trunk and blood vessel branches flows smoothly after the stent is implanted, and the blood vessel bifurcation is prevented from being damaged. The thrombosis risk is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vascular stents, in particular to a stent suitable for vascular bifurcations. Background Art

[0002] A vascular stent is a device that, based on balloon dilatation, supports narrowed and occluded blood vessels, reduces elastic recoil and reshaping, and maintains unobstructed blood flow. For example, the vascular stent disclosed in publication number CN113040988B is a straight tube made of multiple woven metal wires.

[0003] Vascular stents can be categorized by their application: coronary stents, cerebral stents, and renal artery stents. For example, cerebral stents dilate cerebral blood vessels to treat cerebral ischemia. Stroke has become one of the most important causes of disability and death worldwide, with ischemic stroke accounting for over 50% of these cases. Therefore, treating stenotic lesions in vessels related to cerebral perfusion, such as the carotid artery and its branches, the subclavian artery, and the vertebral artery, is crucial for reducing the risk of stroke.

[0004] With the development of endovascular treatment technology and equipment, stent placement for stenotic lesions has become a widely used treatment method. However, in order to cover the lesion as much as possible, the currently used straight-tube stents inevitably need to extend part of the stent into the main trunk of the blood vessel. For example, when treating right subclavian artery stenosis, in order to cover the stenotic lesion at the bifurcation, a portion of the straight-tube stent extends into the main trunk of the innominate artery and right common carotid artery, hindering normal hemodynamics, posing a risk of thrombosis, and potentially causing distal ischemia. For such patients, if endovascular treatment of the right common carotid artery is required in the long term, the portion of the stent extending into the main trunk may hinder the operation of the guidewire and catheter for endovascular treatment, increasing the difficulty of treatment. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies in the existing technology and provide a stent suitable for vascular bifurcations that conforms to the anatomical structure of vascular bifurcations, thereby solving the problem that after the traditional flat-end stent is placed, part of the stent extends into the main blood vessel trunk, blocking the normal blood vessel cavity, thereby reducing the risk of stent-related adverse events; at the same time, it solves the problem that in the future, when it may be necessary to perform intracavitary treatment on the main blood vessel trunk or through the main blood vessel trunk, the stent extends into the main blood vessel trunk to block the instrument, making it difficult to perform intracavitary treatment.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A stent suitable for blood vessel bifurcation, comprising a straight tube stent and a horn stent, wherein the horn stent comprises:

[0008] The speaker upper circle has a highest point and a lowest point;

[0009] The speaker lower ring is connected to the straight tube upper ring of the straight tube bracket. When viewed from above, the lowest point of the speaker upper ring coincides with the speaker lower ring, and the highest point of the speaker upper ring is located outside the speaker lower ring.

[0010] The speaker body is connected between the speaker upper circle and the speaker lower circle.

[0011] As a preferred embodiment, the speaker bracket has a reference surface, the speaker bracket is symmetrically arranged along the reference surface, and the highest point and the lowest point of the speaker upper ring are respectively located on the reference surface;

[0012] The lower ring of the speaker has a left reference point and a right reference point, the left reference point and the right reference point are located on the reference plane, the left reference point is opposite to the lowest point of the upper ring of the speaker, and the right reference point is opposite to the highest point of the upper ring of the speaker.

[0013] As a preferred embodiment, the speaker body has a long arc line, which is located on the reference plane and connected between the highest point of the speaker upper circle and the right reference point;

[0014] The angle between the tangent of the long arc and the axis of the straight tube support is 5-15°.

[0015] As a preferred embodiment, the angle between the tangent of the upper ring of the speaker and the axis of the straight tube bracket is 20-75°.

[0016] As a preferred embodiment, the lower circle of the speaker overlaps with the upper circle of the straight tube of the straight tube bracket.

[0017] As a preferred embodiment, the lowest point of the upper ring of the speaker is located on the upper ring of the straight tube of the straight tube bracket.

[0018] As a preferred embodiment, the straight tube bracket and the speaker bracket are both mesh structures.

[0019] As a preferred embodiment, the metal wire surface of the straight tube stent is attached with or without a coating;

[0020] The metal wire surface of the speaker bracket is not covered with a film.

[0021] As a preferred embodiment, the stent is made of metal wires of the same diameter or multiple diameters.

[0022] As a preferred embodiment, the grid density of the speaker bracket is lower than the grid density of the straight tube bracket.

[0023] Compared with the existing technology, this technical solution has the following advantages:

[0024] The highest point of the upper horn ring is located outside the lower horn ring, which means that the horn bracket is horn-shaped, enhancing the stent's wall adhesion and reducing the need for sutures in the long-term stent. In addition, the upper horn ring has a highest point and a lowest point, so the upper horn ring is beveled, allowing the stent to better fit the anatomical structure of the original arterial branch. The beveled and horn-shaped design of the horn bracket can adapt to the anatomical structure of vascular bifurcations, supporting vascular bifurcations while avoiding unnecessary space occupation of the main vessel trunk, ensuring smooth blood flow in the main and branch vessels after stent implantation, and reducing the risk of thrombosis.

[0025] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the stent suitable for vascular bifurcation according to the present invention;

[0027] Figure 2 This is a dimension diagram of the stent suitable for blood vessel bifurcation described in the present invention.

[0028] In the figure: 100 straight tube bracket, 200 speaker bracket, 200a reference surface, 210 speaker upper circle, 211 highest point, 212 lowest point, 220 speaker lower circle, 221 right reference point, 222 left reference point, 230 speaker body, 231 long arc. DETAILED DESCRIPTION

[0029] The following description is intended to disclose the present invention and enable those skilled in the art to implement the present invention. The preferred embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0030] like Figure 1 As shown, the stent suitable for blood vessel bifurcation includes a straight tube stent 100 and a horn stent 200, and the horn stent 200 includes:

[0031] The speaker upper ring 210 has a highest point 211 and a lowest point 212;

[0032] The speaker lower ring 220 is connected to the straight tube upper ring of the straight tube bracket 100. In a top view, the lowest point 212 of the speaker upper ring 210 coincides with the speaker lower ring 220, and the highest point 211 of the speaker upper ring 210 is located outside the speaker lower ring 220.

[0033] The speaker body 230 is connected between the speaker upper ring 210 and the speaker lower ring 220 .

[0034] The highest point 211 of the upper horn ring 210 is located outside the lower horn ring 220, which means that the horn bracket 200 is horn-shaped, enhancing the stent's wall adhesion and reducing the need for sutures in the long-term stent. Furthermore, the upper horn ring 210 has a highest point 211 and a lowest point 212, so the upper horn ring 210 is beveled, allowing the stent to better conform to the anatomical structure of the existing arterial branch. The beveled and horn-shaped design of the horn bracket 200 can adapt to the anatomical structure of vascular bifurcations, supporting vascular bifurcations while avoiding unnecessary space occupation of the main vessel trunk, ensuring smooth blood flow in the main and branch vessels after stent implantation, and reducing the risk of thrombosis.

[0035] like Figure 1 As shown, the straight tube support 100 is a tubular structure, and the upper and lower straight tube circles of the straight tube support 100 overlap in a top view. The cross-section of the straight tube diameter 100 is circular, that is, the upper and lower straight tube circles of the straight tube support 100 are circular. According to different application scenarios, the diameter and length of the straight tube support 100 can be designed to any appropriate diameter.

[0036] For example, if the length of the right subclavian artery stenosis lesion is 30 mm, the length of the straight tube stent 100 should be slightly longer than 30 mm, such as 35 mm, 40 mm, etc. The diameter of the right subclavian artery is generally 4 to 10 mm, so the diameter of the straight tube stent 100 can be reasonably selected within this range.

[0037] like Figure 1 As shown, the speaker bracket 200 has a reference surface 200a, and the speaker bracket 200 is symmetrically arranged along the reference surface 200a. The highest point 211 and the lowest point 212 of the speaker upper ring 210 are respectively located on the reference surface 200a;

[0038] The lower ring 220 of the speaker has a left reference point 222 and a right reference point 221. The left reference point 222 and the right reference point 221 are located on the reference plane 200a. The left reference point 222 is opposite to the lowest point 212 of the upper ring 210 of the speaker, and the right reference point 221 is opposite to the highest point 211 of the upper ring 210 of the speaker.

[0039] The left reference point 222 is opposite to the lowest point 212 of the upper circle 210 of the speaker, that is, the left reference point 222 and the lowest point 212 of the upper circle 210 of the speaker are both located on the left side, and the right reference point 221 is opposite to the highest point 211 of the upper circle 210 of the speaker, that is, the right reference point 221 and the highest point 211 of the upper circle 210 of the speaker are both located on the right side.

[0040] The straight tube support 100 is also symmetrically arranged along the reference plane 200 a , and the axis of the straight tube support 100 is also located on the reference plane 200 a .

[0041] refer to Figure 1 and Figure 2 The speaker body 230 has a long arc line 231, and the long arc line 231 is located on the reference surface 200a and connected between the highest point 211 of the speaker upper circle 210 and the right reference point 221;

[0042] An included angle A2 between the tangent of the long arc line 231 and the axis of the straight tube support 100 is 5-15°.

[0043] Since the highest point 211 of the speaker upper circle 210 is located outside the speaker lower circle 220 when viewed from above, the long arc line 231 bends outward.

[0044] refer to Figure 1 and Figure 2 The upper ring 210 of the speaker is arc-shaped, and the convex surface of the upper ring 210 of the speaker is set upward, wherein the angle A1 between the tangent of the upper ring 210 of the speaker and the axis of the straight tube bracket 100 is 20~75°, preferably 35~65°.

[0045] refer to Figure 1 The lower circle 220 of the speaker overlaps with the upper circle of the straight tube of the straight tube bracket 100, that is, the lower circle 220 of the speaker is also circular.

[0046] Continue to refer Figure 1 The lowest point 212 of the speaker upper circle 210 is located on the straight tube upper circle of the straight tube bracket 100 .

[0047] The speaker bracket 200 can be designed to have any suitable length according to different application scenarios, and the inner diameter of the bracket can also be designed to have any suitable diameter according to different application scenarios.

[0048] The horn bracket 200 is designed as a transition between the main blood vessel and the branch blood vessel. Its main function is to reduce the part of the bracket entering the main blood vessel cavity. According to the specific bracket diameter, angles A1 and A2, the length of the horn bracket 200 can also be determined.

[0049] like Figure 1 As shown, the straight tube bracket 100 and the speaker bracket 200 are both mesh structures.

[0050] In one embodiment, both the straight tube stent 100 and the horn stent 200 are formed from metal wire, wherein the metal wire can be a nickel-titanium alloy wire to enhance the stent's compliance and facilitate adherence to the wall. The diameter of the metal wire is preferably 0.05-0.2 mm, and can be 0.05 mm, 0.1 mm, 0.15 mm, or 0.2 mm. Alternatively, the stent can be woven from metal wires of the same diameter or multiple diameters.

[0051] In another embodiment, the stent is formed by laser engraving. The stent can be made of nickel-titanium alloy material.

[0052] The straight tube bracket 100 and the speaker bracket 200 can be designed as an integrated body and can be woven together by metal wires.

[0053] The mesh density of the speaker support 200 is lower than that of the straight tube support 100. This improves the compliance of the speaker support 200 and enhances its wall adhesion. The metal mesh density of the straight tube support 100 is preferably a pitch of 2-4 mm, such as 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc., while the metal mesh density of the speaker support 200 is preferably a pitch of 3-5 mm, such as 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0054] The metal wire surface of the straight tube stent 100 may or may not be covered with a film;

[0055] The metal wire surface of the speaker bracket 200 is not coated.

[0056] The coating can be made of polyurethane, polytetrafluoroethylene and other materials, and can be coated on the surface of the metal wire by spraying or soaking, so as to play the role of isolation and promoting tissue growth.

[0057] Multiple imaging markers are provided at both ends of the stent to assist in positioning during stent delivery. In some embodiments, imaging markers are provided on the short and long arcs 231 on the left and right sides of the horn 230, preferably at the center of the lower circle of the straight tube of the straight tube stent 100. These imaging markers are preferably platinum markers.

[0058] In summary, the portion shown in the straight tube stent 100 can be a covered stent or a bare stent (uncovered), used to support branch vessels. The horn stent 200 is a bare stent. The beveled and horn-shaped design of the horn stent 200 can adapt to the anatomical structure of vascular bifurcations, supporting vascular bifurcations while avoiding unnecessary occupation of the main vessel trunk. This ensures smooth blood flow in the main and branch vessels after stent implantation and reduces the risk of thrombosis. While ensuring the success rate of vascular reconstruction, this solves the problem of traditional flat-end stents easily covering branches and partially extending into the main vessel trunk, blocking the normal vascular lumen, thereby reducing the risk of stent-related adverse events. It also solves the problem of future endovascular treatment of the main vessel trunk or through the main vessel trunk being difficult due to the stent extending into the main vessel trunk blocking the instrument.

[0059] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention cannot be limited by these embodiments alone. That is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A stent suitable for vascular bifurcation, characterized in that: It comprises a straight tube support (100) and a speaker support (200), wherein the speaker support (200) comprises: A speaker upper ring (210), wherein the speaker upper ring (210) has a highest point (211) and a lowest point (212); A speaker lower ring (220), the speaker lower ring (220) is connected to the straight tube upper ring of the straight tube bracket (100), and in a top view, the lowest point (212) of the speaker upper ring (210) coincides with the speaker lower ring (220), and the highest point (211) of the speaker upper ring (210) is located outside the speaker lower ring (220); A speaker body (230) is connected between the speaker upper ring (210) and the speaker lower ring (220).

2. The stent suitable for vascular bifurcation according to claim 1, characterized in that: The speaker bracket (200) has a reference surface (200a), the speaker bracket (200) is symmetrically arranged along the reference surface (200a), and the highest point (211) and the lowest point (212) of the speaker upper ring (210) are respectively located on the reference surface (200a); The speaker lower ring (220) has a left reference point (222) and a right reference point (221), the left reference point (222) and the right reference point (221) are located on the reference surface (200a), the left reference point (222) is opposite to the lowest point (212) of the speaker upper ring (210), and the right reference point (221) is opposite to the highest point (211) of the speaker upper ring (210).

3. The stent suitable for blood vessel bifurcation according to claim 2, characterized in that: The speaker body (230) has a long arc (231), and the long arc (231) is located on the reference surface (200a) and connected between the highest point (211) of the speaker upper circle (210) and the right reference point (221); The angle between the tangent of the long arc (231) and the axis of the straight tube support (100) is 5-15°.

4. The stent suitable for vascular bifurcation according to claim 1, characterized in that: The angle between the tangent line of the speaker upper ring (210) and the axis of the straight tube support (100) is 20-75°.

5. The stent suitable for blood vessel bifurcation according to claim 1, characterized in that: The lower ring (220) of the horn overlaps with the upper ring of the straight tube of the straight tube support (100).

6. The stent suitable for blood vessel bifurcation according to claim 5, characterized in that: The lowest point (212) of the speaker upper circle (210) is located on the straight tube upper circle of the straight tube support (100).

7. The stent suitable for blood vessel bifurcation according to claim 1, characterized in that: The straight tube bracket (100) and the speaker bracket (200) both have a mesh structure.

8. The stent suitable for blood vessel bifurcation according to claim 7, characterized in that: The grid density of the speaker bracket (200) is lower than the grid density of the straight tube bracket (100).

9. The stent suitable for blood vessel bifurcation according to claim 1, characterized in that: The stent is made of metal wires of the same diameter or multiple diameters.

10. The stent suitable for blood vessel bifurcation according to claim 9, characterized in that: The metal wire surface of the straight tube stent (100) may or may not be covered with a film; The metal wire surface of the speaker bracket (200) is not covered with a film.

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