A vascular stent

Abstract

The utility model discloses a kind of vascular stents, belong to medical instrument field, including multiple intermediate rings, two end rings, first connecting tendon and second connecting tendon, multiple intermediate rings are evenly arranged along the axial direction of vascular stent, intermediate ring includes multiple first wave unit, two end rings are respectively arranged at the both ends of vascular stent, end ring includes multiple second wave unit, the both ends of first connecting tendon are connected with end ring and intermediate ring respectively, one end of first connecting tendon is connected with the end of second wave unit close to first wave unit, the other end of first connecting tendon is connected with the middle position of the crest and trough of first wave unit, the both ends of second connecting tendon are connected with two intermediate rings connected with each other respectively, and the end of second connecting tendon is connected in the middle position of the crest and trough of first wave unit. The embodiment of the application can reduce axial shortening, can optimize the mechanical distribution of end ring in expansion process, reduce the fracture of end ring and optimize stress distribution.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a vascular stent. Background Technology

[0002] Vascular stents are interventional medical devices used to treat stenosis or occlusion of blood vessels. Structurally, they are mainly divided into metallic stents (commonly made of materials such as stainless steel and nickel-titanium alloys, available in spherical and self-expanding types, some with drug-eluting coatings or membrane designs, such as biodegradable polymer coatings carrying drugs like rapamycin, or polytetrafluoroethylene membranes for aneurysms) and bioresorbable stents (using biodegradable materials such as polylactic acid, magnesium alloys, and zinc alloys, such as 3D-printed modified polylactic acid stents). Their working principle is to mechanically open narrowed blood vessels to restore blood flow, to inhibit restenosis through drug-eluting coatings (such as novel exosome-coated stents that can respond to inflammatory signals for treatment), and to treat special lesions such as aneurysms using membrane or branch designs. Patent application number 202310821908.8 discloses a vascular implant with multiple hollow, perforated corrugated rings arranged continuously in the longitudinal direction. These corrugated rings are interconnected by connecting ribs. Each corrugated ring is a closed ring in the circumferential direction, unfolding into a wavy, tortuous structure with both compressive and expanded states. The end rings are located at both ends, their waveforms differing from the middle rings, and they possess relatively greater expanding force, thus reducing the "dog bone effect." During use, the implant is rolled onto the balloon of a catheter and then introduced into the patient's body through the balloon-equipped catheter. It expands at the treatment site, expanding and securing itself to the blood vessel wall. However, in this vascular implant, the connecting ribs between the end corrugated rings and the middle corrugated rings, as well as the connecting ribs between adjacent middle corrugated rings, have the same structure. The axial shortening rate of the vascular implant remains relatively high, and the end corrugated rings are prone to breakage due to stress concentration during expansion. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a vascular stent with first and second connecting ribs of different structures. The end ring and the intermediate ring are connected by the first connecting rib, and the intermediate rings are connected by the second connecting rib. This optimizes mechanical performance and reduces axial shortening, optimizes the mechanical distribution of the end ring during expansion, reduces the likelihood of end ring breakage, and optimizes stress distribution.

[0004] A vascular stent according to an embodiment of the present invention includes:

[0005] Multiple intermediate rings are evenly spaced along the axial direction of the vascular stent, and each intermediate ring includes multiple first waveform units that are connected end to end in sequence and arranged along the circumference of the vascular stent.

[0006] Two end rings are respectively disposed at both ends of the vascular stent, and each end ring includes a plurality of second waveform units that are connected end to end in sequence and arranged along the circumference of the vascular stent;

[0007] The first connecting rib is connected to the end ring and the middle ring at both ends respectively. One end of the first connecting rib is connected to the end of the second waveform unit that is close to the first waveform unit. The other end of the first connecting rib is connected to the middle position of the peak and trough of the first waveform unit.

[0008] The second connecting rib is connected at both ends to the two connected intermediate rings respectively, and the ends of the second connecting rib are all connected to the middle position of the peak and trough of the first waveform unit.

[0009] A vascular stent according to an embodiment of the present invention has at least the following beneficial effects:

[0010] The end ring and intermediate ring are connected by a first connecting rib, and the intermediate rings are connected by a second connecting rib. One end of the first connecting rib connects to the end of the second waveform unit near the first waveform unit, and the other end connects to the midpoint between the crest and trough of the first waveform unit. The ends of the second connecting ribs are all connected to the midpoint between the crest and trough of the first waveform unit. Compared to the existing technology where the connecting rib structures between the end ring and intermediate ring, and between intermediate rings, are identical, this application uses first and second connecting ribs with different structures, making it more suitable for the application scenarios of vascular stents. The connection method of the intermediate part of the vascular stent has good radial support strength and flexibility, making it easier to move in complex and tortuous vascular environments. The connection method between the end ring and intermediate ring in this application can optimize mechanical performance and reduce axial shortening, optimize the mechanical distribution of the end ring during expansion, reduce the possibility of end ring breakage, and optimize stress distribution.

[0011] According to some embodiments of the present invention, the axial directions of the plurality of intermediate rings and the two end rings are aligned.

[0012] According to some embodiments of the present invention, in two adjacent intermediate rings, the line connecting the peaks of two closely spaced first waveform units is parallel to the axial direction of the vascular stent, and the line connecting the troughs of two closely spaced first waveform units is parallel to the axial direction of the vascular stent.

[0013] According to some embodiments of the present invention, the end ring is located on the side of the middle ring close to the middle position of the peak and trough of the first waveform unit.

[0014] According to some embodiments of the present invention, the first connecting rib is arranged in a straight strip shape.

[0015] According to some embodiments of the present invention, the second connecting rib includes at least one bent segment.

[0016] According to some embodiments of the present invention, the second connecting rib includes at least two curved segments, and the curvature centers of two adjacent curved segments are respectively located on both sides of the second connecting rib.

[0017] According to some embodiments of the present invention, multiple (including two) first connecting ribs are provided, and the multiple first connecting ribs are evenly spaced along the circumferential direction of the vascular stent.

[0018] According to some embodiments of the present invention, multiple (including two) second connecting ribs are provided, and the multiple second connecting ribs are evenly spaced along the circumferential direction of the vascular stent.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the unfolded structure of the vascular stent according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the vascular stent according to an embodiment of the present invention.

[0023] Icon labels:

[0024] 100, Intermediate ring; 110, First waveform unit;

[0025] 200, End ring; 210, Second waveform unit;

[0026] 300. First connecting bar;

[0027] 400, Second connecting bar;

[0028] a. The trough connection of the first waveform unit of multiple intermediate rings;

[0029] b. The connection line between the peaks of the first waveform units of multiple intermediate rings. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Please see Figure 1 and Figure 2 A vascular stent according to an embodiment of the present invention includes multiple intermediate rings 100, two end rings 200, a first connecting rib 300, and a second connecting rib 400. The multiple intermediate rings 100 are evenly spaced along the axial direction of the vascular stent. Each intermediate ring 100 includes multiple first waveform units 110, which are sequentially connected end-to-end and arranged circumferentially along the vascular stent. The two end rings 200 are respectively located at both ends of the vascular stent. Each end ring 200 includes multiple second waveform units 210, which are sequentially connected end-to-end and arranged circumferentially along the vascular stent. The two ends of the first connecting rib 300 are respectively connected to the end rings 200 and the intermediate rings 100. One end of the first connecting rib 300 connects to the end of the second waveform unit 210 near the first waveform unit 110, and the other end of the first connecting rib 300 connects to the midpoint between the crest and trough of the first waveform unit 110. The two ends of the second connecting rib 400 are respectively connected to the two intermediate rings 100, and the ends of the second connecting rib 400 are all connected to the middle position of the peak and trough of the first waveform unit 110.

[0034] The end ring 200 and the intermediate ring 100 are connected by a first connecting rib 300, and the intermediate rings 100 are connected by a second connecting rib 400. One end of the first connecting rib 300 is connected to the end of the second waveform unit 210 that is close to the first waveform unit 110, and the other end of the first connecting rib 300 is connected to the middle position of the crest and trough of the first waveform unit 110. The ends of the second connecting ribs 400 are all connected to the middle position of the crest and trough of the first waveform unit 110. Compared with the prior art where the connecting rib structures between the end ring 200 and the intermediate ring 100, and between the intermediate rings 100, are the same, this application sets different structures for the first connecting rib 300 and the second connecting rib 400, which is more suitable for the application scenarios of vascular stents. The connection method of the middle part of the vascular stent has good radial support strength and flexibility, and can move more easily in complex and tortuous vascular environments. The connection method between the end ring 200 and the intermediate ring 100 in this application can optimize mechanical performance and reduce axial shortening, optimize the mechanical distribution of the end ring 200 during the expansion process, reduce the possibility of end ring 200 fracture, and optimize stress distribution.

[0035] The axial shortening rate of a vascular stent reflects the degree to which the stent shortens along the axial direction of the blood vessel during expansion, and directly affects the following aspects:

[0036] (1) Positioning accuracy: Excessive shortening rate may cause the stent to deviate from the intended position after release, affecting the coverage of the lesion site.

[0037] (2) Vascular adaptability: Stents with low shortening rate can better fit the shape of blood vessels, reduce mechanical stimulation of the blood vessel wall, and reduce the risk of restenosis.

[0038] (3) Surgical success rate: Poor control of shortening rate may increase the difficulty of operation, especially in complex lesions (such as bifurcation lesions).

[0039] Clinical significance of axial shortening rate of vascular stents:

[0040] (1) Safety: A lower axial shortening rate can reduce vascular damage and long-term complications (such as in-stent thrombosis) after stent implantation.

[0041] (2) Functionality: Low-shortage stents are more suitable for small vessels and bifurcation lesions, expanding the range of indications for interventional therapy.

[0042] Experimental example: The support flower pattern adopts two different forms. One is the structure described in the embodiment of this application, which is designated as flower pattern B. The other is the structure in the background art with application number 202310821908.8, which is designated as flower pattern A.

[0043] The axial shortening test results are shown in the table below:

[0044]

[0045] As can be seen, the structural improvements in this design can significantly reduce the axial shortening rate from 5.49% to 2.73%, a reduction of nearly half.

[0046] In some embodiments, see Figure 1 and Figure 2 The axial alignment of the multiple intermediate rings 100 and the two end rings 200 ensures uniformity during vascular stent expansion.

[0047] In some embodiments, see Figure 1 and Figure 2 In two adjacent intermediate rings 100, the line connecting the peaks of two closely spaced first waveform units 110 is parallel to the axis of the vascular stent, and the line connecting the troughs of two closely spaced first waveform units 110 is parallel to the axis of the vascular stent. Figure 1 In this design, the right end of the first waveform unit 110 is defined as the peak, and the left end of the first waveform unit 110 is defined as the trough. The line connecting the peaks of two closely spaced first waveform units 110 is parallel to the line connecting the troughs of two closely spaced first waveform units 110, ensuring uniformity during vascular stent expansion.

[0048] In some embodiments, see Figure 1 and Figure 2 The end of the end ring 200 that is close to the middle ring 100 is connected to the middle position of the peak and trough of the first waveform unit 110 through the first connecting rib 300. The end of the end ring 200 that is close to the middle ring 100 is close to the middle position of the peak and trough of the first waveform unit 110, which makes the overall length of the first connecting rib 300 shorter, optimizes the mechanical distribution of the end ring 200 during the expansion process, reduces the possibility of breakage of the end ring 200, and optimizes the stress distribution.

[0049] In some embodiments, see Figure 1 and Figure 2 The first connecting rib 300 is arranged in a straight strip shape. The overall length of the first connecting rib 300 is relatively short, which optimizes the mechanical distribution of the end ring 200 during the expansion process, reduces the possibility of breakage of the end ring 200, and optimizes the stress distribution.

[0050] In some embodiments, see Figure 1 The first connecting rib 300 has a uniform width, ensuring even stress distribution across its various parts and guaranteeing uniform expansion of the vascular stent. (See also...) Figure 2The width of the end of the first connecting rib 300 connected to the first waveform unit 110 is larger than the width of other parts of the first connecting rib 300, making the connection between the first connecting rib 300 and the first waveform unit 110 more stable and less prone to rupture during the blood vessel dilation process.

[0051] See Figure 1 The second connecting rib 400 has a uniform width, ensuring even stress distribution across its components and guaranteeing uniformity during vascular stent expansion. (See also...) Figure 2 The width at both ends of the second connecting rib 400 is larger than the width at the middle of the second connecting rib 400, making the connection between the second connecting rib 400 and the first waveform unit 110 more stable and less prone to rupture during the blood vessel dilation process.

[0052] In some embodiments, see Figure 1 and Figure 2 The second connecting rib 400 includes at least one curved segment. The second connecting rib 400 can be a single curved segment or a combination of multiple curved segments, and is preferably S-shaped. The second connecting rib 400 has a certain expansion margin during expansion, ensuring uniformity in the expansion of the vascular stent. The S-shaped design of the second connecting rib 400 makes the vascular stent more adaptable to the vascular morphology in curved vessels, reducing mechanical stimulation to the vessel wall. Through optimized structure, the S-shaped second connecting rib 400 and the first connecting rib 300 effectively reduce axial shortening during stent deployment.

[0053] The second connecting rib 400 includes at least two curved segments. The curvature centers of two adjacent curved segments are located on both sides of the second connecting rib 400, and the bending directions of the two adjacent curved segments are opposite, so that the second connecting rib 400 is bent into a wave shape as a whole, making the bending smoother and less prone to cracking during the expansion process.

[0054] In some embodiments, see Figure 1 and Figure 2 Multiple first connecting ribs 300 (including two) are provided, and the multiple first connecting ribs 300 are evenly spaced along the circumference of the vascular stent; multiple second connecting ribs 400 are provided, and the multiple second connecting ribs 400 are evenly spaced along the circumference of the vascular stent. The end ring 200 and the intermediate ring 100 are connected into a tube by the first connecting ribs 300 and the second connecting ribs 400. The multiple first connecting ribs 300 are evenly spaced to ensure uniform stress on the multiple first connecting ribs 300, and the multiple second connecting ribs 400 are evenly spaced to ensure uniform stress on the multiple second connecting ribs 400, thus ensuring uniformity in the expansion of the vascular stent.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vascular stent, characterized in that, include: Multiple intermediate rings are evenly spaced along the axial direction of the vascular stent, and each intermediate ring includes multiple first waveform units that are connected end to end in sequence and arranged along the circumference of the vascular stent. Two end rings are respectively disposed at both ends of the vascular stent, and each end ring includes a plurality of second waveform units that are connected end to end in sequence and arranged along the circumference of the vascular stent; The first connecting rib is connected to the end ring and the middle ring at both ends respectively. One end of the first connecting rib is connected to the end of the second waveform unit that is close to the first waveform unit. The other end of the first connecting rib is connected to the middle position of the peak and trough of the first waveform unit. The second connecting rib is connected at both ends to the two connected intermediate rings respectively, and the ends of the second connecting rib are all connected to the middle position of the peak and trough of the first waveform unit.

2. A vascular stent according to claim 1, characterized in that, The axial direction of the plurality of intermediate rings and the two end rings is aligned.

3. A vascular stent according to claim 1, characterized in that, In two adjacent intermediate rings, the line connecting the peaks of the two first waveform units that are close to each other is parallel to the axis of the vascular stent.

4. A vascular stent according to claim 1, characterized in that, In two adjacent intermediate rings, the line connecting the troughs of the two closest first waveform units is parallel to the axial direction of the vascular stent.

5. A vascular stent according to claim 1, characterized in that, The end ring is located on the side of the middle ring close to the middle position of the peak and trough of the first waveform unit.

6. A vascular stent according to claim 1, characterized in that, The first connecting rib is arranged in a straight strip shape.

7. A vascular stent according to claim 1, characterized in that, The second connecting rib includes at least one bent segment.

8. A vascular stent according to claim 7, characterized in that, The second connecting rib includes at least two curved segments, and the curvature centers of two adjacent curved segments are located on both sides of the second connecting rib.

9. A vascular stent according to claim 1, characterized in that, The first connecting rib is provided in multiple ways, and the multiple first connecting ribs are evenly spaced along the circumferential direction of the vascular stent.

10. A vascular stent according to claim 1, characterized in that, The second connecting rib is provided in multiple ways, and the multiple second connecting ribs are evenly spaced along the circumferential direction of the vascular stent.

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