Superior mesenteric artery dedicated stent

Abstract

The application provides a supramesenteric artery special stent, which comprises a plurality of single-layer meshes; the plurality of single-layer meshes are sequentially connected to form a tubular stent, and the tubular stent has a certain bending curvature; the head section and the tail section of the tubular stent are of the same mesh structure; and the single-layer meshes of the middle section of the tubular stent are connected through a plurality of connecting pieces, so that the bending curvature of the middle section of the tubular stent can be adjusted. In the application, the plurality of single-layer meshes are sequentially connected to form a tubular stent which itself has a movable bending curvature; then, according to the bending curvature of the supramesenteric artery, the bending curvature of the middle section of the tubular stent is adjusted through the connecting pieces, so as to adapt to the bending stroke of the supramesenteric artery; then, the stent is implanted into the lesion position of the supramesenteric artery, and cooperates with the supramesenteric artery, so that the stent can better adhere to the supramesenteric artery, and the supporting effect of the supramesenteric artery is improved.

Description

Technical Field

[0001] This invention relates to the field of superior mesenteric artery technology, and more specifically to a stent specifically designed for the superior mesenteric artery. Background Technology

[0002] The superior mesenteric artery originates from the anterior wall of the abdominal aorta at approximately lumbar vertebral level. It descends behind the splenic vein and the head of the pancreas, crosses in front of the uncinate process of the pancreas, and enters the root of the small intestine's mesentery between the lower border of the pancreas and the level of the duodenum. It then runs obliquely downwards and to the right, anastomosing with the ileal branch of the ileocolic artery at the right iliac fossa. The main trunk of the superior mesenteric artery is arched slightly to the left. From the convex side of the arch, the pancreaticoduodenal artery and more than ten jejunal and ileal arteries give off in sequence, while from the concave side, the middle colic artery, right colic artery, and ileocolic artery give off in sequence.

[0003] The superior mesenteric artery has a tortuous course to accommodate and facilitate the function of the small intestine. When lesions such as dissection and embolism occur in the superior mesenteric artery, lower limb artery stents are usually used for stenting. There is no dedicated superior mesenteric artery stent. However, due to the tortuous course of the superior mesenteric artery, using lower limb artery stents as a substitute is not very effective. Summary of the Invention

[0004] In view of the above-mentioned problems in the existing technology, the technical problem to be solved by the present invention is that the replacement of the superior mesenteric artery with lower limb arterial stents is not effective due to the tortuous course of the superior mesenteric artery.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a special stent for superior mesenteric artery, comprising: multiple single-layer meshes; multiple single-layer meshes are sequentially connected to form a tubular stent, and the tubular stent has a certain curvature; the first and last sections of the tubular stent are mesh structures with the same structure; the single-layer meshes in the middle section of the tubular stent are connected by multiple connectors, so that the curvature of the middle section of the tubular stent is adjustable.

[0006] In this invention, a tubular stent is formed by sequentially connecting multiple single-layer meshes, which has its own movable bending arc. Then, according to the bending arc of the superior mesenteric artery, the bending arc of the middle section of the tubular stent is adjusted by the connector to adapt to the bending stroke of the superior mesenteric artery. The stent is then implanted into the lesion site of the superior mesenteric artery and cooperates with the superior mesenteric artery, so that the stent can better fit with the superior mesenteric artery and improve the support effect of the superior mesenteric artery.

[0007] Preferably, the tubular stent is a tapered structure with a thicker initial section and a thinner distal section. By using a tapered tubular stent to adapt to the shape of the superior mesenteric artery, which is larger at the proximal end and smaller at the distal end, the support effect of the superior mesenteric artery can be further improved.

[0008] Preferably, the single-layer mesh is a ring shape with its ends connected; the single-layer mesh includes multiple convex segments, multiple concave segments, and multiple extension segments; the multiple convex segments and multiple concave segments are staggered, and the two ends of the multiple convex segments and multiple concave segments are connected sequentially through extension segments to form a wave-like shape along the axial direction of the ring. The mesh structure formed by multiple sequentially connected wave-like single-layer meshes effectively supports the superior mesenteric artery.

[0009] Preferably, the included angle α between the two extended segments connected at both ends of the upper convex segment is greater than the included angle β between the two extended segments connected at both ends of the lower concave segment. This forms a frustum-shaped single-layer grid, and multiple frustum-shaped single-layer grids are stacked to form a conical tubular support.

[0010] Preferably, the single-layer mesh of the first segment of the tubular support is sequentially fixedly connected. This improves the support strength of the first segment.

[0011] Preferably, the convex segments of a single-layer mesh intersect with the corresponding concave segments of adjacent single-layer meshes, and are secured at the intersection by a fixing sleeve, which is fixedly connected to the intersection. This improves the stability of the connection between two adjacent single-layer meshes.

[0012] Preferably, each of the plurality of connectors corresponds one-to-one with a recessed section of a single-layer mesh. Each connector includes a connecting rod and a limiting block. The recessed section of the single-layer mesh has a small hole for the connecting rod to pass through. One end of the connecting rod is fixedly connected to a convex section of the single-layer mesh and is parallel to the axis of the single-layer mesh. The other end of the connecting rod is fixedly connected to the limiting block. The limiting block cannot pass through the small hole. A connecting rod on one single-layer mesh passes through a small hole on an adjacent single-layer mesh and is limited by the limiting block, effectively preventing the connecting rod from sliding out of the small hole. By sliding the connecting rod to different positions through the small hole, the angle between two adjacent single-layer meshes is changed, thereby adjusting the curvature of the middle section of the tubular support.

[0013] Preferably, the connecting rod has multiple tapered protrusions arranged along its axis; the larger diameter end of each tapered protrusion is located away from the limiting block, and the diameter of the larger diameter end is slightly larger than the diameter of the small hole. The tapered protrusions effectively limit the position of the small hole on the connecting rod, thereby fixing the bending curvature of the middle section of the tubular support to a less than desired degree.

[0014] Preferably, the concave section is thickened at the location of the small hole. This can improve the strength at the small hole.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] 1. Improves the support effect of the superior mesenteric artery. In this invention, a tubular stent is formed by connecting multiple single-layer meshes in sequence, which has its own movable bending arc. The bending arc of the middle section of the tubular stent is adjusted according to the bending arc of the superior mesenteric artery via connectors, thereby adapting to the bending stroke of the superior mesenteric artery. The stent is then implanted at the lesion site of the superior mesenteric artery, cooperating with it to better fit the artery and improve its support effect. Furthermore, the conical tubular stent, adapted to the proximal-smaller shape of the superior mesenteric artery, further enhances its support effect.

[0017] 2. The bending curvature of the middle section of the tubular support can be adjusted. In this invention, a connecting rod on a single-layer grid passes through a small hole on an adjacent single-layer grid and is limited by a limiting block to effectively prevent the connecting rod from sliding out of the small hole. By sliding the connecting rod to different positions through the small hole, the included angle between two adjacent single-layer grids is changed, thereby enabling adjustment of the bending curvature of the middle section of the tubular support. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the structure of the superior mesenteric artery stent provided in an embodiment of the present invention.

[0020] Figure 2 This is a structural diagram of a single-layer mesh provided in an embodiment of the present invention.

[0021] Figure 3 This is a partial connection diagram of the first or last segment of the tubular support provided in an embodiment of the present invention.

[0022] Figure 4 This is a partial structural diagram of the middle section of the tubular support provided in an embodiment of the present invention.

[0023] Reference numerals: 1-first section, 2-middle section, 3-tail section, 4-single-layer grid, 41-upper convex section, 42-lower concave section, 43-extension section, 5-connector, 51-connecting rod, 52-limiting block, 53-small hole, 54-conical protrusion, 6-fixing sleeve. Detailed Implementation

[0024] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0025] In this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] See Figure 1 The present invention provides an embodiment of a superior mesenteric artery stent, comprising: multiple single-layer meshes 4; multiple single-layer meshes 4 are sequentially connected to form a tubular stent, and the tubular stent has a certain curvature; furthermore, the tubular stent is a conical structure with a thicker first segment 1 and a thinner last segment 3, which adapts to the shape of the superior mesenteric artery, which is larger at the proximal end and smaller at the distal end, thereby further improving the support effect of the superior mesenteric artery; the first segment 1 and the last segment 3 of the tubular stent are mesh structures with the same structure; the single-layer meshes 4 of the middle segment 2 of the tubular stent are connected by multiple connectors 5, so that the curvature of the middle segment 2 of the tubular stent is adjustable. Multiple single-layer meshes 4 are connected in sequence to form a tubular stent with its own movable bending arc. Then, according to the bending arc of the superior mesenteric artery, the bending arc of the middle section 2 of the tubular stent is adjusted by the connector 5 to adapt to the bending stroke of the superior mesenteric artery. The stent is then implanted into the lesion site of the superior mesenteric artery and cooperates with the superior mesenteric artery so that the stent can better fit with the superior mesenteric artery and improve the support effect of the superior mesenteric artery.

[0028] See Figure 1 and Figure 2In other embodiments, the single-layer mesh 4 is a ring shape with its ends connected. The single-layer mesh 4 includes multiple convex segments 41, multiple concave segments 42, and multiple extension segments 43. The multiple convex segments 41 and multiple concave segments 42 are staggered, and the two ends of the multiple convex segments 41 and multiple concave segments 42 are connected sequentially through extension segments 43, forming a wave shape along the axial direction of the ring. The multiple sequentially connected wave-shaped single-layer meshes 4 form a mesh structure, thereby effectively supporting the superior mesenteric artery. Furthermore, the included angle α between the two extension segments 43 connected at both ends of the convex segment 41 is greater than the included angle β between the two extension segments 43 connected at both ends of the concave segment 42. This forms a frustum-shaped single-layer mesh 4, and multiple frustum-shaped single-layer meshes 4 are stacked to form a conical tubular support.

[0029] See Figure 1 and Figure 3 In other embodiments, the single-layer mesh 4 of the first segment 1 of the tubular support is sequentially fixedly connected. This improves the support strength of the first segment 1. Furthermore, the convex segment 41 of a single-layer mesh 4 is intersected with the corresponding concave segment 42 on the adjacent single-layer mesh 4, and is fitted onto the intersection by a fixing sleeve 6, which is fixedly connected to the intersection. In specific implementation, after the convex segment 41 and the concave segment 42 are installed intersectingly, the fixing sleeve 6 with an opening on one side is fitted onto the intersection and fixed to the intersection; this improves the stability of the connection between two adjacent single-layer meshes 4. Similarly, the tail segment 3 has the same structure as the first segment 1.

[0030] See Figures 1-4In another embodiment, multiple connectors 5 correspond one-to-one with the recessed sections 42 of the single-layer mesh 4. Each connector 5 includes a connecting rod 51 and a limiting block 52. The recessed section 42 of the single-layer mesh 4 has a small hole 53 for the connecting rod 51 to pass through. Furthermore, the recessed section 42 is thickened at the position of the small hole 53 to improve the strength at the small hole 53. One end of the connecting rod 51 is fixedly connected to the upper convex section 41 of the single-layer mesh 4 and is parallel to the axis of the single-layer mesh 4. The other end of the connecting rod 51 is connected to the limiting block 52. 2. Fixed connection; the limiting block 52 cannot pass through the small hole 53; furthermore, the connecting rod 51 is provided with multiple conical protrusions 54 arranged along the axis of the connecting rod 51; the larger diameter end of the conical protrusion 54 is located on the side away from the limiting block 52, and the diameter of the larger diameter end of the conical protrusion 54 is slightly larger than the diameter of the small hole 53. The conical protrusion 54 can effectively limit the position of the small hole 53 on the connecting rod 51, thereby fixing the bending arc of the middle section 2 of the tubular support. In specific implementation, the connecting rod 51 on a single-layer grid 4 passes through the small hole 53 on the adjacent single-layer grid 4 and is limited by the limiting block 52, effectively preventing the connecting rod 51 from sliding out of the small hole 53. By sliding the small hole 53 to different positions of the connecting rod 51, the included angle between two adjacent single-layer grids 4 is changed, thereby adjusting the bending arc of the middle section 2 of the tubular support.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A stent specifically designed for the superior mesenteric artery, characterized in that, include: Multiple single-layer grids (4); Multiple single-layer grids (4) are connected in sequence to form a tubular support, and the tubular support has a certain curvature; The first segment (1) and the last segment (3) of the tubular stent are mesh structures with the same structure; The single-layer grid (4) of the middle section (2) of the tubular support is connected by multiple connectors (5), so that the curvature of the middle section (2) of the tubular support can be adjusted. The single-layer mesh (4) is a ring shape with the ends connected; the single-layer mesh (4) includes multiple convex segments (41), multiple concave segments (42) and multiple extension segments (43). Multiple convex segments (41) and multiple concave segments (42) are staggered, and the two ends of multiple convex segments (41) and multiple concave segments (42) are connected in sequence by extension segments (43) to form a wave-like shape in the axial direction of the ring. Each of the connectors (5) corresponds one-to-one with the recessed section (42) of the single-layer grid (4). The connector (5) includes a connecting rod (51) and a limiting block (52). The recessed section (42) of the single-layer mesh (4) is provided with a small hole (53) for the connecting rod (51) to pass through. One end of the connecting rod (51) is fixedly connected to the upper convex section (41) of the single-layer mesh (4) and is parallel to the axis of the single-layer mesh (4); the other end of the connecting rod (51) is fixedly connected to the limiting block (52). The limiting block (52) cannot pass through the small hole (53); The connecting rod (51) is provided with a plurality of tapered protrusions (54) arranged along the axis of the connecting rod (51); the larger diameter end of the tapered protrusion (54) is located on the side away from the limiting block (52), and the diameter of the larger diameter end of the tapered protrusion (54) is slightly larger than the diameter of the small hole (53).

2. The superior mesenteric artery stent according to claim 1, characterized in that, The tubular support is a conical structure with a thick first section (1) and a thin last section (3).

3. The superior mesenteric artery stent according to claim 1, characterized in that, The included angle α between the two extension segments (43) connected at both ends of the upper convex segment (41) is greater than the included angle β between the two extension segments (43) connected at both ends of the lower concave segment (42).

4. The superior mesenteric artery stent according to claim 3, characterized in that, The single-layer mesh (4) of the first segment (1) of the tubular support is fixedly connected in sequence.

5. The superior mesenteric artery stent according to claim 4, characterized in that, A single-layer mesh (4) includes an upper convex segment (41) that is intersected with the corresponding lower concave segment (42) on an adjacent single-layer mesh (4), and is fitted at the intersection by a fixing sleeve (6), which is fixedly connected to the intersection.

6. The superior mesenteric artery stent according to claim 1, characterized in that, The concave section (42) is thickened at the position of the small hole (53).

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