Stent end development structure, forming method and vascular stent

Abstract

The present application relates to a stent end developing structure, comprising a mounting portion and a developing portion, wherein one end of the mounting portion is suitable for being mounted on a vascular stent, and a fixing groove is provided in the middle portion, forming two support sections. The developing portion is made of a developing material and has a spring coil structure, and the developing portion is arranged on the mounting portion in a ring, and the developing portion located on at least one side outside the fixing groove is recessed inward, and the developing portion can be fixed on the support section. A low-cost alloy wire is used as the developing material through processing technology, and is processed into a special-shaped spring that is wound around the stent developing structure. The developing wire is embedded in the supporting section structure of the mounting portion in the form of riveting, thereby achieving a mechanical connection between the two materials. The developing portion is made of a developing material, which is easy to use, and the developing portion outside at least one side of the fixing groove is recessed inward. The limiting method of this developing portion and the mounting portion is internal riveting. The riveting operation method is easier to operate than that of a developing ring, and the molding cost of the developing portion made of a spring coil structure made of developing wire is also lower than that of a developing ring.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a stent end development structure, a molding method, and a vascular stent. Background Art

[0002] Because the stent's deployment and position need to be observed under X-rays after implantation, a radiographic imaging mechanism is typically incorporated into the stent. This imaging mechanism is typically located at either end or in the middle of the stent. It typically consists of a capillary tube made of a radiopaque precious metal alloy, which is encased in the stent's braided wire or cut rods. Due to the inherently small size of the stent itself, the smaller the imaging ring, the smaller the capillary dimensions, and the tighter the manufacturing tolerances, the higher the procurement cost for device manufacturers.

[0003] In summary, the prior art lacks a vascular stent that has both a simple structure and low cost. Summary of the Invention

[0004] In view of this, the present application proposes a stent end developing structure, which is suitable for being installed at one end of a vascular stent, and includes a mounting portion and a developing portion; one end of the mounting portion is suitable for being installed to the vascular stent, and a fixing groove is provided on one side; the developing portion is made of a developing material and has a spring coil structure, and the developing portion is fixed in an annular manner on the outside of the mounting portion, and the developing portion at least covers most of the fixing groove; the developing portion located outside the fixing groove is recessed inward and is clamped and fixed to the mounting portion.

[0005] In a possible implementation, the developing portion includes a first sleeve segment, multiple spring coils of the first sleeve segment have the same structure, a radial projection of the first sleeve segment is square, and an inwardly concave side of the first sleeve segment is a side with a larger area.

[0006] In a possible implementation, the fixing groove is a through groove that is connected to each other on two opposite sides of the mounting portion.

[0007] In a possible implementation, one side of the developing portion outside the through groove is recessed inward.

[0008] In a possible implementation, the side of the first sleeve section opposite to the inward depression is a convex arc structure for fitting against the inner wall of a blood vessel.

[0009] In a possible implementation, the mounting portion is in a square bar structure, and a connecting portion connected to the bracket is provided outwardly at one end in the length direction of the mounting portion.

[0010] In a possible implementation, an extension portion is provided outwardly at the other end of the mounting portion in the length direction, and a width of the extension portion is smaller than a width of the mounting portion.

[0011] In a possible implementation, the width of the mounting portion decreases sequentially from the connecting portion to the extending portion; and the mounting portion is provided with a limiting portion in the width direction on a side close to the connecting portion.

[0012] In one possible implementation, one end of the first sleeve segment near the extension portion is connected to the head end of the second sleeve segment, the second sleeve segment is sleeved outside the extension portion, and the second sleeve segment has a variable diameter structure; wherein the diameter of the multiple spring coils of the second sleeve segment gradually decreases to a preset length from the connecting portion to the extension portion, and the spring coils near the end of the second sleeve segment are circular.

[0013] In a possible implementation, an arc-shaped protective head is provided at the end of the extension portion.

[0014] In a possible implementation manner, glue or filler is coated between the gap between the developing portion and the mounting portion.

[0015] On the other hand, the present application proposes a vascular stent suitable for being threaded on a guide wire, comprising a stent body and a stent end developing structure as described in any one of the above implementation methods; the stent body is a hollow cylinder, and the side wall of the stent body is a mesh structure, and one end of the stent body has several intersections of the mesh structure, and the number of the stent end developing structures is multiple, and they are installed at intervals at the intersection of this end of the stent body.

[0016] In a possible implementation, the end of the stent end developing structure that is not connected to the stent main body has a preset inclination toward the axial direction of the stent main body.

[0017] In one possible implementation, the developing portion includes a first sleeve segment, the multiple spring coils of the first sleeve segment have the same structure, the radial projection of the first sleeve segment is square, and the inwardly concave side of the first sleeve segment is a side with a larger area; the fixing groove is a through groove that is interconnected on two opposite sides of the mounting portion; the developing portion is concave inward on one side outside the through groove; the concave side of the first sleeve segment is toward the axial direction of the bracket body.

[0018] In a possible implementation, the mounting portion has an arc-shaped cross-section perpendicular to the axial direction of the bracket body, and a line connecting the cross-sections of the plurality of mounting portions in this direction is in the shape of a circular ring.

[0019] On the other hand, the present application also proposes a molding method for a developing structure at the end of a bracket, which is used to prepare the developing structure at the end of a bracket as described in any one of the implementation methods above, comprising the following steps: step one, processing the fixing groove on the mounting portion; step two, annularly arranging the developing portion on the mounting portion, and at least part of the developing portion covers the outside of the fixing groove, to obtain a main body to be pressed; step three, placing the main body to be pressed into a suitable mold, and then using a riveting machine with a pressing portion to rivet the developing portion, pressing the developing portion covering the outside of the fixing groove into the inside of the fixing groove, thereby completing the mechanical riveting of the mounting portion and the developing portion.

[0020] In one possible implementation, in step three, the pressing portion includes a straight head and a tapered head; the riveting machine drives the straight head to squeeze the developing portion so that the developing portion is completely fitted with the upper and lower surfaces of the mounting portion, and then the straight head moves away; the riveting machine drives the tapered head to rivet the developing portion at the position of the fixing groove so that the developing portion is pressed into the inside of the fixing groove.

[0021] In a possible implementation, in step 2, the developing wire that has not been formed into the developing part is wound on the mounting part at intervals to obtain the main body to be pressed, or the developing wire that has been formed into the developing part is sleeved on the mounting part to obtain the main body to be pressed.

[0022] The beneficial effects of the bracket end development structure of the present application are: by using alloy wire with low processing technology and cost as the development material, it is processed into a heterogeneous spring and wrapped around the bracket development structure, and the development wire is embedded in the support section structure of the mounting part through riveting, thereby realizing the mechanical connection of the two materials.

[0023] Not only that, the developing part with a spring coil structure is arranged on the mounting part with a fixed groove. The developing part is made of developing material, and the material is simple to use. The developing part outside at least one side of the fixing groove is recessed inward and embedded in the fixing groove. The limiting method of this developing part and the mounting part is internal riveting. The mechanically riveted developing structure of the bracket end, compared with the design of the developing ring, takes into account the easy operation and simple structure of the practitioners in this field. The molding cost of the developing part with a spring coil structure made of the developing wire is also lower than that of the developing ring.

[0024] The beneficial effects of the vascular stent of the present application are: by installing any of the aforementioned stent end development structures to the distal position of the vascular stent, when the vascular stent of the present application is delivered during surgery, the development area of ​​the stent end development structure thereon is larger than the development ring area, so its development effect is more obvious, making it easier for the surgeon to grasp the situation at that position in the human body, complete the surgery, and effectively improve the efficiency of the surgery.

[0025] The beneficial effects of the molding method of the bracket end development structure of the present application are as follows: a fixing groove is processed on the mounting portion, and a hollow cylindrical development portion is arranged on the mounting portion, and the development portion can cover most or all of the fixing groove to obtain a main body to be pressed, and then the development portion located at the fixing groove is riveted inward from one side or both sides, so that the development portion has a recess at the fixing groove position, thereby being more firmly fixed at the bracket end development structure. This molding method is simple and convenient, and is easy for practitioners in this field to operate. In addition, the method of arranging the development wire ring outside the mounting portion greatly reduces the cost compared to the use of a development ring. The bracket end development structure that is deformed by riveting has a larger development area than the development ring area, and the development effect is more obvious, making it easier for the surgeon to grasp the situation in the human body at that position, thereby effectively improving the efficiency of the operation.

[0026] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0028] Figure 1 A schematic diagram showing the three-dimensional structure of a bracket end developing structure according to one embodiment of the present application;

[0029] Figure 2 A schematic diagram showing the three-dimensional structure of the bracket end developing structure according to the second embodiment of the present application;

[0030] Figure 3 A schematic diagram showing the three-dimensional structure of the bracket end developing structure according to the third embodiment of the present application;

[0031] Figure 4 A schematic diagram showing the three-dimensional structure of the bracket end developing structure according to the fourth embodiment of the present application;

[0032] Figure 5 A radial cross-sectional view showing a stent end development structure located within a microcatheter according to an embodiment of the present application;

[0033] Figure 6 An expanded view of a vascular stent according to an embodiment of the present application is shown;

[0034] Figure 7 A schematic diagram showing the three-dimensional structure of the developing unit according to an embodiment of the present application is shown;

[0035] Figure 8 A schematic diagram showing the three-dimensional structure of a developing unit according to another embodiment of the present application is shown;

[0036] Figure 9 A schematic structural diagram showing a mounting portion according to an embodiment of the present application;

[0037] Figure 10 A schematic structural diagram showing a mounting portion according to another embodiment of the present application;

[0038] Figure 11 A partial schematic diagram showing the stent end development structure located within a microcatheter according to the present application. DETAILED DESCRIPTION

[0039] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0040] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0042] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0043] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0044] Figure 1 A schematic diagram showing the three-dimensional structure of a bracket end developing structure according to one embodiment of the present application;

[0045] Figure 2 A schematic diagram showing the three-dimensional structure of the bracket end developing structure according to the second embodiment of the present application; Figure 3 A schematic diagram showing the three-dimensional structure of the bracket end developing structure according to the third embodiment of the present application; Figure 4 A schematic diagram showing the three-dimensional structure of the bracket end developing structure according to the fourth embodiment of the present application; Figure 5 A radial cross-sectional view showing a stent end development structure located within a microcatheter according to an embodiment of the present application; Figure 6 An expanded view of a vascular stent according to an embodiment of the present application is shown; Figure 7 A schematic diagram showing the three-dimensional structure of the developing unit according to an embodiment of the present application is shown; Figure 8 A schematic diagram showing the three-dimensional structure of a developing unit according to another embodiment of the present application is shown; Figure 9 A schematic structural diagram showing a mounting portion according to an embodiment of the present application; Figure 10 A schematic structural diagram showing a mounting portion according to another embodiment of the present application; Figure 11 A partial schematic diagram showing the stent end development structure located within a microcatheter according to the present application.

[0046] like Figure 1-11 As shown, the stent end developing structure is suitable for installation on one end of the vascular stent 1, and includes: a mounting portion 20 and a developing portion 10. One end of the mounting portion 20 is suitable for installation on the vascular stent 1, and a fixing groove 25 is provided in the middle to form two support segments 26. The developing portion 10 is made of a developing material and has a spring coil structure. The developing portion 10 is annularly arranged on the mounting portion 20, and the developing portion 10 located on at least one side outside the fixing groove 25 is recessed inward, and the developing portion 10 can be fixed on the support segment 26.

[0047] In this embodiment, by using a processing technology and a low-cost alloy wire as the developing material, a heterosexual spring is processed and wrapped around the developing structure of the bracket, and the developing wire is embedded in the supporting section 26 structure of the mounting portion 20 by riveting to achieve a mechanical connection between the two materials.

[0048] Moreover, the developing part 10 having a spring coil structure is arranged on the mounting part 20 having a fixing groove 25. The developing part 10 is made of a developing material, and the material is simple to use. The developing part 10 outside at least one side of the fixing groove 25 is recessed inward and embedded in the fixing groove 25. The limiting method of this developing part 10 and the mounting part 20 is internal riveting. The mechanically riveted developing structure of the bracket end, compared with the design of the developing ring, takes into account the easy operation and simple structure of the practitioners in this field. The molding cost of the developing part 10 with a spring coil structure made of the developing wire is also lower than that of the developing ring.

[0049] Furthermore, the developing portion 10 uses a radiopaque developing material, and is usually prepared and formed using platinum tungsten wire or platinum iridium wire. The shape of the developing portion 10 is not limited in this embodiment. It is only necessary to ensure that it can adapt to the mounting portion 20 and is relatively firmly fixed outside the fixing groove 25. It should also be pointed out that the mounting portion 20 is installed at one end of the vascular stent 1. During the operation, the vascular stent 1 is sleeved in the microguidewire 50. For the convenience of description, the conveying direction of the microguidewire 50 is the same as the setting direction of the mounting portion 20, and the fixing groove 25 is also opened in the mounting portion 20 perpendicular to the conveying direction of the microguidewire 50.

[0050] In one specific embodiment, the developing unit 10 includes a first sleeve segment 11 . The multiple spring coils of the first sleeve segment 11 have the same structure. The radial projection of the first sleeve segment 11 is square, and the inwardly concave side of the first sleeve segment 11 is a side with a larger area.

[0051] In this embodiment, the first sleeve section 11 is a square spring with one side recessed inward, and this recessed side is the side with the larger area of ​​the square spring. The structure of the first sleeve section 11 does not change the circumferential length of the developing portion 10 perpendicular to the direction of microguidewire 50 transport. That is, the developing portion 10 of the first sleeve section 11 is generally a hollow cylindrical or rectangular structure.

[0052] Preferably, the first sleeve section 11 is a square spring, and the concave surface is opened on the surface with a larger area. The square spring can be originally a circular spring coil. After being sleeved on the specified position of the mounting portion 20, it is deformed by pressing to make its shape flatter. Compared with the circular spring coil, the square spring coil with a flatter shape can better fit the two larger surfaces of the mounting portion 20, and compared with the unprocessed circular spring coil, its axial development area is also larger.

[0053] It should be noted that the direction in which the mounting portion 20 has a preset thickness is the direction in which the opposite sides of the fixing groove 25 are facing. Since the mounting portion 20 itself is relatively thin, usually around 0.05 mm, the inward depression on both sides of the fixing groove 25 greatly increases the difficulty and cost of processing, and there is no significant difference in the limiting effect of the developing portion 10 on the mounting portion 20.

[0054] In one specific embodiment, the fixing groove 25 is a through groove connected to each other on two opposite sides of the mounting portion 20 .

[0055] In this embodiment, since the mounting portion 20 is located at the far end of the bracket, its thickness is relatively thin. The through-groove structure connected on both sides is easier to process than the groove body opened on one side, and is easier to process when riveting the recess of the developing portion 10. The connection between the developing portion 10 and the mounting portion 20 is also tighter, which reasonably improves the connection strength between the two.

[0056] In one specific embodiment, one side of the developing portion 10 outside the through groove is recessed inward.

[0057] In one embodiment, the opposite side of the first sleeve section 11 that is concave inwardly is a convex arc-shaped structure for fitting against the inner wall of the blood vessel and the inner wall of the microcatheter 40 .

[0058] In the above two embodiments, one side of the first sleeve segment 11 is recessed inward, and the opposite side of the inward recess of the first sleeve segment 11 is a convex arc structure protruding outward, that is, the opposite side of the recess of the first sleeve segment 11 is a convex arc structure, and the convex arc structure on this side serves as the outer side of the stent end, which is attached to the inner wall of the blood vessel, and the recessed side of the first sleeve segment 11 is the inner side of the stent end, facing the axial direction of the micro guidewire 50.

[0059] Preferably, the first sleeve section 11 is a rectangular spring with one side recessed inward, the mounting portion 20 is a square rod with a preset thickness and a fixing groove 25 in the middle, the rectangular spring is fitted onto the square rod, and the first sleeve section 11 is located on one side of the fixing groove 25 recessed inward, and the first sleeve section 11 is riveted inward to complete the limit position on the mounting portion 20.

[0060] In one specific embodiment, the mounting portion 20 is in a square bar structure, and a connecting portion 21 connected to the bracket is provided outwardly at one end of the mounting portion 20 in the longitudinal direction.

[0061] In this embodiment, the mounting portion 20 is in the form of a square bar, typically a rectangular bar of a certain thickness. One end of the mounting portion 20 in the width direction is connected to the vascular stent 1. The specific structure of the fixing groove 25 is not further limited because it serves as a limit for the developing portion 10. A connecting portion 21 is provided at one end of the mounting portion 20 in the length direction. The connecting portion 21 is used to connect to the vascular stent 1, and the connecting portion 21 can better connect to the intersection 31 at this end of the vascular stent 1. Compared to the end face of the mounting portion 20 in the width direction, the connecting portion 21 is smaller in width, which facilitates connection with the vascular stent 1. This makes the design of the developing structure of the stent end of the present application more reasonable, and this end of the stent has better toughness, thereby improving the overall mechanical properties.

[0062] Furthermore, under normal circumstances, the fixing groove 25 is in the shape of a long strip, and the two ends of the long strip can be smoothly connected in an arc shape, or in a straight connection. It is only necessary to ensure that the long strip-shaped fixing groove 25 is slightly shorter than the mounting portion 20. When the fixing groove 25 occupies a larger area of ​​the mounting portion 20, there are enough developing portions 10 that can be riveted to the fixing groove 25. The developing portion 10 is tightly connected to the mounting portion 20, and part of the developing portion 10 is embedded in the mounting portion 20 through the fixing groove 25.

[0063] In one specific embodiment, an extension portion 22 is provided outwardly at the other end of the mounting portion 20 in the longitudinal direction, and the width of the extension portion 22 is smaller than the width of the mounting portion 20 .

[0064] In this embodiment, the extension portion 22 provided at the other end of the mounting portion 20 in the length direction, i.e., the end of the mounting portion 20 in the length direction that is not connected to the vascular stent 1, has a width smaller than that of the mounting portion 20 and maintains the same thickness.

[0065] In one specific embodiment, the width of the mounting portion 20 decreases from the connecting portion 21 to the extending portion 22 , and the mounting portion 20 is provided with a limiting portion 23 in the width direction on a side close to the connecting portion 21 .

[0066] In this embodiment, the limiting portion 23 is arranged in the width direction of the side of the mounting portion 20 close to the connecting portion 21. In the process of assembling the developing portion 10 onto the mounting portion 20, the limiting portion 23 can effectively avoid over-assembly, that is, after the head end of the developing portion 10 with a spring coil structure is sleeved on the outer side of the mounting portion 20 from one side, the head end has already escaped from the mounting portion 20 from the other side, affecting the assembly efficiency. The limiting portion 23 makes it convenient for implementers in this field to directly put the developing portion 10 into place on the mounting portion 20 without observation or any skills during assembly, and the operation is simple and convenient.

[0067] In one specific embodiment, the developing part includes a first sleeve section 11, and the multiple spring coils of the first sleeve section 11 have the same structure. The radial projection of the first sleeve section 11 is square, and the side of the first sleeve section 11 that is concave inward is a side with a larger area. The fixing groove 25 is a through groove that is interconnected on opposite sides of the mounting part 20. One side of the developing part 10 outside the through groove is concave inward, and the concave side of the first sleeve section 11 is toward the axial direction of the bracket body 30.

[0068] In one specific embodiment, one end of the first sleeve section 11 close to the extension portion 22 is connected to the head end of the second sleeve section 12, wherein the second sleeve section 12 is sleeved on one side of the mounting portion 20 located at the fixing groove 25, and the second sleeve section 12 is a circular spring whose diameter gradually decreases from the connecting portion 21 to the extension portion 22.

[0069] In this embodiment, for ease of description, the end close to the operator is the proximal end, and the end close to the patient is the distal end. The end of the first sleeve segment 11 close to the extension portion 22 is connected to the second sleeve segment 12, that is, the developing portion 10 is composed of the first sleeve segment 11 and the second sleeve segment 12 connected thereto. Normally, the developing portion 10 is a special-shaped spring formed by integrally molding the first sleeve segment 11 and the second sleeve segment 12. The first sleeve segment 11 is sleeved and adapted to the outside of the mounting portion 20, and the second sleeve segment 12 is sleeved and adapted to the outside of the extension portion 22 with a smaller width, and the second sleeve segment 12 is changed The circular spring has a diameter that gradually decreases from the connecting portion 21 to the extending portion 22, that is, the second sleeve segment 12 is connected to the distal end of the first sleeve segment 11, and the diameter of the first sleeve segment 11 gradually decreases from the proximal to the distal direction. The second sleeve segment 12 has a smaller distal diameter and better passability, which is beneficial to the overall introduction of the vascular stent 1 into the introduction sheath, microcatheter 40, etc. For example, it is more convenient for the mounting portion 20 with the developing portion 10 to enter the microcatheter 40 from the proximal side of the introduction sheath to the distal side, thereby reducing unnecessary trouble for practitioners in this field.

[0070] Furthermore, in this embodiment, the gradually decreasing diameter of the first sleeve section 11 from the proximal end to the distal end helps to further improve the overall passability of the vascular stent 1 of the present application. Since it is arranged at the distal end of the stent, the diameter gradually increases from the distal end to the proximal end, which is beneficial for the operator to transport the vascular stent 1 from the proximal end to the distal end of the patient.

[0071] In one specific embodiment, an arc-shaped protective head 24 is provided at the end of the extension portion 22 .

[0072] In this embodiment, an arc-shaped protective head 24 is provided at the end of the extension portion 22 not connected to the mounting portion 20 . The specific structure of the arc-shaped protective head 24 is not limited, and it is only necessary to ensure that the arc surface faces the distal end.

[0073] Preferably, the mounting portion 20 and the distal end of the developing portion 10 are laser welded to form a smooth ball head, which avoids puncturing blood vessels and is more conducive to introducing the stent from the introduction sheath into the microcatheter 40.

[0074] In one specific embodiment, glue or filler is coated between the gap between the developing portion 10 and the mounting portion 20 .

[0075] In this embodiment, UV curing glue can be applied to the gap between the developing part 10 and the mounting part 20 or the gap can be filled with fillers. The specific filling position is mainly to fill the UV curing glue at the position of the developing part 10 where the depression is formed by riveting. Curing glue can also be applied to one end, both ends or all the outer surfaces of the connection to increase the connection strength between the developing part 10 and the mounting part 20, and avoid shaking of the developing structure at the end of the bracket during display and movement.

[0076] In summary, the bracket development structure of the present application can reduce the cross-sectional height of the development structure perpendicular to the micro-guidewire 50 direction (branch radial direction) through riveting. (It should be explained here that in the prior art, the development ring is directly sleeved, and the cross-sectional height perpendicular to the micro-guidewire 50 direction is its diameter, while the circular ring spring structure of the same size in the present application, the development part 10 that is slightly "flattened" after riveting can significantly reduce the cross-sectional height perpendicular to the micro-guidewire 50 direction, that is, it is smaller than the diameter of the development ring of the same size), and the riveting processing flow is relatively simple, and it is easy to implement the process, and a simpler development wire is used to achieve the development effect of the bracket. Compared with the processing method of using a development ring, the cost can be greatly reduced. At least the recess of the development part 10 is filled with glue or other fillers to increase the structural strength of the development wire and the bracket.

[0077] On the other hand, the present application proposes a vascular stent 1, which is suitable for being passed through a micro guidewire 50, including a stent body 30 and the stent end developing structure described in any of the above-mentioned specific embodiments. The stent body 30 is a hollow cylinder, and the side wall of the stent body 30 is a mesh structure, and one end of the stent body 30 has several intersections 31 of the mesh structure. The number of the stent end developing structures is multiple, and they are installed at intervals on the intersections 31 at this end of the stent body 30.

[0078] Based on any of the aforementioned stent end imaging structures, the present application further provides a vascular stent 1. The vascular stent 1 of the present application embodiment includes any of the aforementioned stent end imaging structures. By installing any of the aforementioned stent end imaging structures at the distal end of the vascular stent 1, when the vascular stent 1 of the present application is delivered during surgery, the imaging area of ​​the stent end imaging structure is larger than the imaging ring area, resulting in a more pronounced imaging effect, making it easier for the surgeon to understand the situation in the human body at that location and complete the surgery, thereby effectively improving surgical efficiency.

[0079] like Figure 6 As shown, this is a structural expansion diagram of the vascular stent 1. In this embodiment, the vascular stent 1 is passed through the micro guidewire 50. The vascular stent 1 is generally in the shape of a circular tube with a mesh structure arranged in a circle. The distal end of the vascular stent 1 has multiple intersections 31 of the mesh structure, and the proximal end of each mounting portion 20 is connected to one of the intersections 31.

[0080] Preferably, there are four mounting portions 20 equidistantly arranged on the stent body 30 , that is, in the radial section of the vascular stent 1 , the angle between two adjacent mounting portions 20 and the straight line connecting the axis of the vascular stent 1 is 90°.

[0081] In one specific embodiment, the end of the stent end developing structure that is not connected to the stent body 30 has a preset inclination toward the axial direction of the stent body 30 .

[0082] In one specific embodiment, the developing part 10 includes a first sleeve section 11, which is a square spring with one side concave inward, and the inward concave side is a side with a larger area, and the concave side of the first sleeve section 11 is facing the axial direction of the bracket body 30.

[0083] In the above embodiment, the distal end of the developing structure at the end of the stent is preset to be tilted toward the axial direction of the stent body 30 (the same direction as the axial direction of the micro-guidewire 50). In addition to machining, this tilt can also be achieved by directly applying pressure toward the axial direction of the micro-guidewire 50 to the distal end manually or using appropriate tools to complete this step. It should also be pointed out that the specific tilt angle is not limited. It is only necessary to ensure that the radial length of the distal end of the developing structure at the end of the stent is less than the radial length of the proximal end, so that when it enters the microcatheter 40 from the introduction sheath in the blood vessel, it is conducive to the transportation of the entire vascular stent 1 of the present application and has better passability.

[0084] In one specific embodiment, the cross section of the mounting portion 20 perpendicular to the axial direction of the bracket body 30 is an arc-shaped structure, and the cross sections of the plurality of mounting portions 20 in this direction are connected to form a circular ring.

[0085] In this embodiment, in conjunction with the embodiment of the stent imaging structure described above, "One side of the first sleeve segment 11 is inwardly concave, and the side of the first sleeve segment 11 opposite the inward concave side is a convex arc-shaped structure that bulges outward. That is, the side of the first sleeve segment 11 opposite the concave side is a convex arc-shaped structure, and the convex arc-shaped structure on this side serves as the outer side of the stent end portion, abutting against the inner wall of the blood vessel. The concave side of the first sleeve segment 11 is the inner side of the stent end portion, facing the axis of the microguidewire 50."

[0086] like Figure 2 、 Figure 5 As shown, more specifically, except that the concave opposite side of the first sleeve section 11 is a convex arc structure, the mounting portion 20 is an arc structure in a cross section perpendicular to the direction of the micro guide wire 50. This structure is an arc structure formed by bending the square bar mounting portion 20 to one side. The mounting portion 20 with a slightly curved surface on one side can also be regarded as Figure 2 、 Figure 5The "fan-shaped" structure presented in the figure is convenient for adapting to the inner wall of the blood vessel, and is consistent with the curvature of the convex arc structure on the opposite side of the depression of the first sleeve section 11, making the design of the stent development structure more reasonable. That is, the depression of the development part 10 on the development structure is toward the axial direction of the micro-guide wire 50, and the convex arc structure of the development part 10 is relatively depressed and arranged toward the outside of the stent, so that it can be attached to the inner wall of the blood vessel. Not only that, the line connecting the development structures at the end of the stent in the radial section of the micro-guide wire 50 is annular, which is easy to adapt to the inner wall of the blood vessel, and makes the vascular stent 1 of the present application more smooth during transportation.

[0087] On the other hand, the present application also proposes a molding method for a developing structure at the end of a bracket, which is used to prepare the developing structure at the end of a bracket in any of the above-mentioned possible implementation methods, including the following steps: step one, processing a fixing groove 25 on the mounting part 20, step two, annularly setting the developing part 10 on the mounting part 20, and at least part of the developing part 10 covering the outside of the fixing groove 25 to obtain a main body to be pressed, step three, placing the main body to be pressed into a suitable mold, and then using a riveting machine with a pressing part to rivet the developing part 10, pressing the developing part 10 covering the outside of the fixing groove 25 into the inside of the fixing groove 25, thereby completing the mechanical riveting of the mounting part 20 and the developing part 10.

[0088] Based on any of the above-mentioned stent end display structures, the present application further provides a method for forming the stent end display structure. The method for forming the stent end display structure of the embodiments of the present application can prepare any of the above-mentioned stent end display structures.

[0089] By processing a fixing groove 25 on the mounting portion 20, and annularly setting the hollow cylindrical developing portion 10 on the mounting portion 20, and the developing portion 10 can cover most or all of the fixing groove 25, a main body to be pressed is obtained, and then the developing portion 10 located at the fixing groove 25 is riveted inward from one side or both sides, so that the developing portion 10 has a recess at the position of the fixing groove 25, thereby being more firmly fixed at the developing structure at the end of the bracket. This molding method is simple and convenient, and is easy for practitioners in this field to operate. In addition, the method of setting the developing wire ring outside the mounting portion 20 greatly reduces the cost compared to using a developing ring, and the developing structure at the end of the bracket that is deformed by riveting has a larger developing area than the developing ring area, and the developing effect is more obvious, which makes it easier for the surgeon to grasp the situation at this position in the human body, thereby effectively improving the efficiency of the operation.

[0090] In one specific embodiment, in step three, the pressing part includes a straight head and a tapered head. The riveting machine drives the straight head to squeeze the developing part 10 so that the developing part 10 is completely fitted with the upper and lower surfaces of the mounting part 20. Then, the straight head is moved away, and the riveting machine drives the tapered head to rivet the developing part 10 at the position of the fixing groove 25 so that the developing part 10 is pressed into the fixing groove 25.

[0091] In this embodiment, practitioners in this field can place the assembled main body to be pressed into a mold that is shaped appropriately for the main body. The specific structure does not need to be limited, as long as it can stably and firmly fix the main body to be pressed.

[0092] In one specific embodiment, the driving front end of the riveting machine has a straight rod structure, and the lower end of the straight rod structure is respectively installed with a straight head and a tapered head in the front and rear directions. The riveting machine is located above the corresponding mold. The riveting machine drives the straight rod structure downward, which can make the straight head or the tapered head rivet the developing part 10 downward to the fixed groove 25 position in the mounting part 20 and make it concave, and then drive the straight rod forward and backward in the front and rear directions of the riveting machine to switch to use the straight head / tapered head for riveting.

[0093] More specifically, the mold used to fix the main body to be pressed is an arc-shaped groove, the structure of which is consistent with the inner wall of a conventional blood vessel to ensure that after riveting, one side of the bottom of the main body to be pressed is an arc surface, which directly adapts to the inner wall of the blood vessel after processing.

[0094] In one specific embodiment, in step 2, the developing wire that has not been formed into the developing part 10 is wound on the mounting part 20 at intervals to obtain the main body to be pressed, or the developing wire that has been formed into the developing part 10 is sleeved on the mounting part 20 to obtain the main body to be pressed.

[0095] In summary, the overall preparation process of the stent end development structure and the whole vascular stent 1 of the present application is as follows:

[0096] 1. The main body 30 of the mesh structure is formed in a circular tube shape, and the mounting parts 20 are evenly spaced at the distal intersection 31 of the main body 30;

[0097] 2. The main body to be pressed is obtained by winding the developing wire that has not yet been formed into the developing part 10 on the mounting part 20 at intervals, or by sleeve-mounting the developing wire that has been formed into the developing part 10 on the mounting part 20.

[0098] 3. The bracket body 30 is horizontally mounted on the processing positioning column, and the distal end of the bracket body 30 with the mounting portion 20 is facing the corresponding arc groove mold. At this time, the mounting portion 20 located at the lowest point on the bracket body 30 is exactly located in this arc groove mold.

[0099] 4. The riveting machine starts working according to the preset process. First, the flat head is located just above the position where the developing part 10 covers the fixing groove 25. The riveting machine drives the straight rod to move downward by a first preset distance, pressing the top surface of the developing part 10 mounted on the mounting part 20 to be flat. The bottom surface of the developing part 10 and the mounting part 20 initially present a downward arc structure.

[0100] 5. After the straight head riveting is completed, the riveting machine drives the straight rod to move back to its position, and then feeds or retreats until the tapered head is located directly above the main body to be pressed (the main body to be pressed here refers to the overall workpiece with the developing part 10 sleeved on the mounting part 20 that has not completed all the riveting processes), and moves downward by a second preset distance (the second preset distance is greater than the first preset distance). The tapered head applies downward force to the developing part 10 located on the fixing groove 25, so that the upper surface of the developing part 10 is recessed into the fixing groove 25 of the mounting part 20, and the bottom surface of the developing part 10 and the mounting part 20 completely present a downward arc structure, so that the bottom surface of the developing part 10 and the mounting part 20 are completely consistent with the shape of the inner wall of the blood vessel, completing the preparation and molding process of the developing structure of the stent end.

[0101] 6. After the displacement, the processing positioning column exits the corresponding mold and rotates the preset angle until the next un-riveted body to be pressed is located at the bottom of the stent body 30. The processing positioning column is displaced again to make the body to be pressed re-enter the corresponding mold. Repeat steps 4 and 5 until all the bodies to be pressed on the stent body 30 are riveted and the preparation of a vascular stent 1 is completed.

[0102] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A stent end display structure, suitable for installation at one end of a vascular stent, characterized in that: It includes a mounting part and a developing part; One end of the mounting portion is suitable for mounting on the vascular stent, and one side is provided with a fixing groove; The developing portion is made of developing material and has a spring coil structure. The developing portion is fixed around the outside of the mounting portion and covers at least most of the fixing groove. The developing portion located outside the fixing groove is recessed inwardly and is fixedly engaged with the mounting portion; The developing portion includes a first sleeve section, wherein the plurality of spring coils of the first sleeve section have the same structure; The mounting portion is in a square bar structure, and a connecting portion connected to the bracket is provided outwardly at one end in the length direction of the mounting portion; The mounting portion is provided with an extension portion outwardly at the other end in the length direction, and the width of the extension portion is smaller than the width of the mounting portion; The developing portion is composed of a first sleeve section and a second sleeve section connected thereto, wherein one end of the first sleeve section close to the extending portion is connected to the head end of the second sleeve section; Wherein, the second sleeve section is sleeved outside the extension portion, and the second sleeve section has a diameter-changing structure; The diameters of the multiple spring coils of the second sleeve section gradually decrease from the connecting portion to the extending portion to a preset length, and the spring coils near the end of the second sleeve section are circular.

2. The bracket end developing structure according to claim 1, characterized in that: The fixing grooves are through grooves that are connected to each other on opposite sides of the mounting portion.

3. The bracket end developing structure according to claim 2, characterized in that: One side of the developing portion is located outside the through groove and is recessed inwards.

4. The bracket end developing structure according to claim 3, characterized in that: The opposite side of the first sleeve section that is concave inwardly is a convex arc structure for fitting to the inner wall of the blood vessel.

5. The bracket end developing structure according to claim 1, characterized in that: The width of the mounting portion decreases in sequence from the connecting portion to the extending portion; The mounting portion is provided with a limiting portion in a width direction close to one end of the connecting portion.

6. The bracket end developing structure according to claim 1, characterized in that: An arc-shaped protective head is provided at the end of the extension portion.

7. The bracket end developing structure according to claim 1, characterized in that: Glue or filler is coated between the gap between the developing portion and the mounting portion.

8. A vascular stent suitable for being threaded onto a guide wire, characterized in that: It comprises a stent body and the stent end developing structure according to any one of claims 1 to 7; The bracket body is a hollow column, and the side wall of the bracket body is a mesh structure. One end of the bracket body has several intersections of the mesh structure. The number of the developing structures at the end of the bracket is multiple, and they are installed at intervals on the intersections of this end of the bracket body.

9. The vascular stent according to claim 8, characterized in that: An end of the bracket end developing structure that is not connected to the bracket main body has a preset inclination toward the axial direction of the bracket main body.

10. The vascular stent according to claim 8, characterized in that: The developing portion includes a first sleeve section, wherein the plurality of spring coils of the first sleeve section have the same structure; The fixing grooves are through grooves connected to each other on opposite sides of the mounting portion; The developing portion is located outside the through groove, and one side thereof is recessed inwardly; The concave side of the first sleeve section faces the axial direction of the bracket body.

11. The vascular stent according to claim 8, characterized in that: The mounting portion has an arc-shaped cross section perpendicular to the axial direction of the bracket body, and a connecting line of the cross sections of the plurality of mounting portions in this direction is in the form of a circular ring.

12. A method for forming a stent end developing structure, used for preparing the stent end developing structure according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Processing the fixing groove on the mounting portion; Step 2: Angle the developing portion on the mounting portion, with at least a portion of the developing portion covering the outside of the fixing groove, to obtain a main body to be pressed; Step three: Place the main body to be pressed into a suitable mold, and then use a riveting machine with a pressing part to rivet the developing part, press the developing part covering the outside of the fixing groove into the inside of the fixing groove, and complete the mechanical riveting of the mounting part and the developing part.

13. The method for forming a stent end developing structure according to claim 12, wherein: In step 3, the pressing portion includes a straight head and a tapered head; The riveting machine drives the straight head to squeeze the developing part so that the developing part is completely in contact with the upper and lower surfaces of the mounting part, and then the straight head moves away; The riveting machine drives the tapered head to rivet the developing portion at the position of the fixing groove, so that the developing portion is pressed into the interior of the fixing groove.

14. The method for forming a stent end developing structure according to claim 12, wherein: In the step 2, the developing wire that has not been formed into the developing part is wound on the mounting part at intervals to obtain the main body to be pressed, or the developing wire that has been formed into the developing part is sleeved on the mounting part to obtain the main body to be pressed.

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