Central open-loop imaging vascular stent

Abstract

The present application relates to a developing vascular stent with an open loop in the middle, comprising: a stent body, the stent body comprising first and second annular support structures, the first annular support structure being a group of first struts connected end to end in sequence to form an annular structure, the second annular support structure being a group of second struts connected end to end in sequence to form an annular structure, the axial length of the first annular support structure being greater than the axial length of the second annular support structure, the circumferences of the two being equal, the first annular support structure and the second annular support structure being arranged adjacent to each other along their axial direction to form an open loop structure therebetween, and the multiple sections of the first and second annular support structures as a whole forming an aneurysm neck support segment located at the aneurysm opening, and anchoring vascular segments connected to the distal and proximal ends of the aneurysm neck support segment, respectively. By adopting a method of arranging the large and small rods in layers in the axial direction, the number of connection points of adjacent structures is reduced, the degree of freedom is higher, and the compliance of the vascular stent is improved, the bending performance is better, and the wall adhesion effect is better.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a developing vascular stent with an open ring in the middle. Background Art

[0002] The treatment of cerebral vascular bleeding diseases generally involves the use of dense mesh stents to reconstruct blood flow guidance or auxiliary stents to assist coil embolization. The usual surgical strategy is to first establish a pathway, then deliver devices such as stents or coils to the lesion site, push out the stents or coils, block the diseased blood vessel aneurysm, and complete the operation.

[0003] Among them, auxiliary stent-assisted coil embolization therapy is a common treatment method. This treatment method has high requirements for the stent. The stent must have sufficient compliance and good wall adhesion performance, and it must also be visible under X-rays to facilitate the surgeon to judge the opening status of the stent.

[0004] However, in the prior art, vascular stents cannot have sufficient compliance and good wall adhesion performance while also having a high imaging area to facilitate the operator to observe the specific condition from outside the patient's body. Summary of the Invention

[0005] In view of this, the present application proposes a developing blood vessel stent with an open loop in the middle, comprising a stent body; the stent body comprises a first annular support structure and a second annular support structure; the first annular support structure is a group of first struts connected end to end in sequence to form an annular structure; the second annular support structure is a group of second struts connected end to end in sequence to form an annular structure; the axial length of the first annular support structure is greater than the axial length of the second annular support structure, and the circumferences of the two are equal, the first annular support structure and the second annular support structure are arranged adjacent to each other along the axial direction to form an open loop structure therebetween; and multiple sections of the first annular support structure and multiple sections of the second annular support structure as a whole constitute a tumor neck support segment located at the tumor ostium position, and anchoring blood vessel segments respectively connected to the distal and proximal ends of the tumor neck support segment; a developing segment is provided between the tumor neck support segment and the anchoring blood vessel segment;

[0006] The developing section is composed of two first annular support structures connected together, and there are multiple connection points connecting the two first annular support structures and multiple middle developing mounting parts between the two first annular support structures, and the developing body is arranged on the middle developing mounting part.

[0007] In a possible implementation, the ratio of the number of the first supporting rods in a group to the number of the second supporting rods in a group is 2:3.

[0008] In a possible implementation, the connection point and the middle developing mounting portion are arranged adjacent to each other in the circumferential direction of the developing section; and the developing body is arranged on the middle developing mounting portion.

[0009] In a possible implementation, the middle developing mounting portion is a straight rod-shaped structure, and the middle developing mounting portion and the axial direction of the bracket body are arranged parallel to each other.

[0010] In a possible implementation, one end of the middle developing mounting portion is a fixed end, connected to the first annular support structure on one side, and the other end is a free end, not in contact with the first annular support structure on the other side; wherein the middle developing mounting portions arranged alternately are fixed to the first annular support structure located on the same side; or the middle developing mounting portions arranged alternately are fixed to the first annular support structure located on the opposite side, and the developing body is axially staggered in the developing section.

[0011] In one possible implementation, the fixed end of the middle developing mounting portion is fixed to the first annular support structure, adjacent to one side of the first annular support structure on the other side, and the middle developing mounting portion is connected to the intersection position where the first support rods are connected end to end.

[0012] In a possible implementation, the middle developing mounting portion is symmetrically arranged on the two first annular support structures, and there is a mounting gap between the two opposite middle developing mounting portions; the middle developing mounting portion is connected to the intersection position where the first support rods are connected end to end; the developing body is passed through the two oppositely arranged middle developing mounting portions.

[0013] In a possible implementation, the developing body is a radiopaque spring coil or metal ring, and there are four of them, which are evenly distributed in the circumference of the developing section.

[0014] In a possible implementation, two adjacent second annular support structures are connected to form a closed-loop structure, and one end of at least one anchoring vascular segment that is not connected to the tumor neck support segment has the closed-loop structure.

[0015] In a possible implementation, the axial length of the tumor neck support segment is within [4 mm, 10 mm].

[0016] In a possible implementation, the sum of the first annular support structure and the second annular support structure in the tumor neck support segment is an odd number of segments.

[0017] In a possible implementation, the total number of the first annular support structure and the second annular support structure in the tumor neck support segment is 3 or 5 segments.

[0018] In a possible implementation, the first support rod is a straight rod structure, and a straight length of the first support rod is within [1.2 mm-2.5 mm].

[0019] In a possible implementation, the included angle between two adjacent first supporting rods in the same group is within the range of [40°-100°].

[0020] In a possible implementation, the second support rod is a straight rod structure, and a straight length of the second support rod is within [0.7 mm-2 mm].

[0021] In a possible implementation, the included angle between two adjacent second supporting rods in the same group is within [35°, 90°].

[0022] In a possible implementation, the shortening rate of the stent body is between 6% and 15%.

[0023] In a possible implementation, both ends of the stent body have flared structures, and an angle between the flared structure and the axial direction of the stent body is within [30°, 60°].

[0024] In a possible implementation, the anchoring vessel segment is provided with an end display mounting portion outwardly at one end away from the tumor neck support segment, and the display body is provided on the end display mounting portion.

[0025] The beneficial effects of the present application are as follows: a stent body is formed by arranging multiple sections of first annular support structures and multiple sections of second annular support structures adjacent to each other along their axial direction, and the axial length of the first support rod is greater than the axial length of the second support rod, and the large and small rods are arranged in layers in the axial direction to form an open-loop structure between the adjacent first annular support structures and the second annular support structures, that is, some connection points are staggered due to the unequal axial lengths of the first support rod and the second support rod, thereby reducing the number of connection points on the adjacent segment structures, so that the middle-open-loop developing vascular stent of the present application has sufficient radial support performance in the blood vessel while having a high degree of freedom, reasonably and effectively improving the compliance of the vascular stent, better bending performance, and better toughness of the vascular stent, thereby making the vascular stent better able to adhere to the inner wall of the blood vessel.

[0026] Not only that, the reduced connection points make the stent have a larger compression amount and toughness. When it is not released to the target position in the patient's body, it ensures that the middle open-loop developing vascular stent of this application is located in the introduction sheath. When in a compressed state, it has a smaller volume, which is convenient for delivery to the target tissue in the patient's body.

[0027] 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

[0028] 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.

[0029] Figure 1 A schematic diagram of the planar deployment structure of a developing vascular stent with an open-loop structure at one end, a closed-loop structure at one end, and an open-loop structure in the middle is shown in an embodiment of the present application;

[0030] Figure 2 A schematic diagram showing the planar deployment structure of a developing vascular stent with a closed-loop structure at both ends and an open-loop structure in the middle according to an embodiment of the present application;

[0031] Figure 3 A schematic diagram showing the planar deployment structure of a developing vascular stent with closed loops at both ends and an open loop in the middle according to another embodiment of the present application is shown;

[0032] Figure 4 A side structural diagram of a developing vascular stent with an open middle portion according to an embodiment of the present application is shown;

[0033] Figure 5 A schematic diagram showing a developing vascular stent with an open middle portion in an embodiment of the present application being released at a position corresponding to an aneurysm;

[0034] Figure 6 A schematic diagram showing the connection relationship between the middle developing mounting portion and the developing section in an embodiment of the present application;

[0035] Figure 7 A schematic structural diagram of a developing section according to an embodiment of the present application is shown;

[0036] Figure 8 A schematic diagram showing a developing vascular stent with an open middle portion according to another embodiment of the present application being released at a position corresponding to an aneurysm. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Figure 1 A schematic diagram of the planar deployment structure of a developing vascular stent with an open-loop structure at one end, a closed-loop structure at one end, and an open-loop structure in the middle is shown in an embodiment of the present application; Figure 2 A schematic diagram showing the planar deployment structure of a developing vascular stent with a closed-loop structure at both ends and an open-loop structure in the middle according to an embodiment of the present application; Figure 3 A schematic diagram showing the planar deployment structure of a developing vascular stent with closed loops at both ends and an open loop in the middle according to another embodiment of the present application is shown; Figure 4 A side structural diagram of a developing vascular stent with an open middle portion according to an embodiment of the present application is shown; Figure 5 A schematic diagram showing a developing vascular stent with an open middle portion in an embodiment of the present application being released at a position corresponding to an aneurysm; Figure 6 A schematic diagram showing the connection relationship between the middle developing mounting portion and the developing section in an embodiment of the present application; Figure 7 A schematic structural diagram of a developing section according to an embodiment of the present application is shown; Figure 8 A schematic diagram showing a developing vascular stent with an open middle portion according to another embodiment of the present application being released at a position corresponding to an aneurysm.

[0043] like Figures 1-8 As shown, the developing vascular stent with an open ring in the middle includes: a stent body, the stent body includes a first annular support structure 10 and a second annular support structure 20, the first annular support structure 10 is a group of first support rods 100 connected end to end to form an annular structure, the second annular support structure 20 is a group of second support rods 200 connected end to end to form an annular structure, the axial length of the first annular support structure 10 is greater than the axial length of the second annular support structure 20, and the circumferences of the two are equal, the first annular support structure 10 and the second annular support structure 20 are arranged adjacent to each other along their axial direction, forming an open ring structure 30 therebetween, and multiple sections of the first annular support structure 10 and the multiple sections of the second annular support structure 20 as a whole constitute a tumor neck support segment 1 located at the tumor opening position, and an anchoring vascular segment 3 connected to the distal and proximal ends of the tumor neck support segment 1 respectively.

[0044] In this embodiment, a stent body is formed by arranging multiple segments of first annular support structures 10 and multiple segments of second annular support structures 20 adjacent to each other along the axial direction, and the axial length of the first support rod 100 is greater than the axial length of the second support rod 200. The large and small rods are arranged in layers in the axial direction to form an open-loop structure 30 between the adjacent first annular support structures 10 and the second annular support structures 20. That is, some connection points are staggered due to the unequal axial lengths of the first support rod 100 and the second support rod 200, thereby reducing the number of connection points on the adjacent segment structures. This allows the imaging vascular stent with an open loop in the middle of the present application to have sufficient radial support performance in the blood vessel while having a high degree of freedom, reasonably and effectively improving the compliance of the vascular stent, improving the bending performance, and improving the toughness of the vascular stent, thereby achieving better adhesion to the inner wall of the blood vessel.

[0045] Not only that, the reduced connection points make the stent have a larger compression amount and toughness. When it is not released to the target position in the patient's body, it ensures that the middle open-loop developing vascular stent of this application is located in the introduction sheath. When in a compressed state, it has a smaller volume, which is convenient for delivery to the target tissue in the patient's body.

[0046] Furthermore, the first annular support structure 10 formed by connecting the first support rods 100 end to end and the second annular support structure 20 formed by connecting the second support rods 200 end to end are arranged adjacent to each other along their axial direction. The connection method of this arrangement is: among the multiple intersection points on the first support rods 100 connected end to end and the multiple intersection points on the second support rods 200 connected end to end, only some of the intersection points can be connected to each other, and the rest are not connected to the adjacent annular support structures.

[0047] It should also be emphasized that the lengths of the anchoring vascular segment 3 at the distal end and the anchoring vascular segment 3 at the proximal end can be the same or different. When using them specifically, practitioners in this field must first ensure the position of the tumor 4. For example, if there is a side branch vessel 6 next to the tumor 4, the anchoring vascular segment 3 on this side needs to be further extended to completely cross the side branch vessel 6 to provide support for the vascular stent as a whole. The extended section is also the first annular support structure 10 and the second annular support structure 20, which are arranged in sequence along their axially adjacent connection until they can be extended to the position of the inner wall of the blood vessel where there is no side branch vessel 6, ensuring that the anchoring vascular segment 3 at this end can provide stable support. Therefore, for the length of the anchoring vascular segment 3, practitioners in this field can independently formulate the lengths of the anchoring vascular segments 3 at the distal and proximal ends of the tumor neck support segment 1 according to the specific surgical conditions.

[0048] Furthermore, the open-loop structure 30 referred to in this application is a structure in which, after the first annular support structure 10 and the second annular support structure 20 are axially connected, only the intersection points where they meet end-to-end are connected to each other, and the remaining connection points are not connected to the adjacent annular support structure. The closed-loop structure 40 referred to in this application is a structure in which, after the two adjacent second annular support structures 20 are axially connected, the intersection points between the two second annular support structures 20 completely correspond to each other and are connected to each other as a whole.

[0049] In one specific embodiment, the ratio of the number of the first support rods 100 to the number of the second support rods 200 is 2:3.

[0050] In this embodiment, the number of first support rods 100 in a group and the number of second support rods 200 in a group are 2:3, that is, for every four first support rods 100 connected end to end, there are six second support rods 200 connected end to end.

[0051] Preferably, the number of the first struts 100 is 16 and the number of the second struts 200 is 24. The stent body formed with this number has a reasonable structural strength while ensuring that the number of struts on the stent body is appropriate and can adapt to the inner diameter of most blood vessels.

[0052] More specifically, the number of first struts 100 in a group is 16, and the number of second struts 200 in a group is 24. There are only four connection points between the first annular support structure 10 and the second annular support structure 20 connected in this number. Compared with the conventional arrangement of the first struts 100 and the second struts 200 with equal lengths and one-to-one correspondence between all connection points, while ensuring that the imaging vascular stent with an open middle ring of the present application has good support performance in the radial direction, its compliance and wall adhesion are fully improved.

[0053] Furthermore, the tumor neck support section 1 adopts a design in which the length of the first support rod 100 is greater than the length of the second support rod 200, and the first annular support structure 10 and the second annular support structure 20 are axially staggered. When the vascular stent of the present application is in a compressed state, the radial volume of the stent can be reduced, reducing the pushing resistance generated by practitioners in this field during pushing.

[0054] In one specific embodiment, two adjacent second annular support structures 20 are connected to form a closed-loop structure 40 , and at least one end of the anchoring vascular segment 3 that is not connected to the tumor neck support segment 1 has a closed-loop structure 40 .

[0055] In this embodiment, at least one end of the anchoring vascular segment 3 that is not connected to the tumor neck support segment 1 has a closed-loop structure 40, that is, one end of the stent body has this closed-loop structure 40. Usually, this closed-loop structure 40 is arranged at the distal end of the stent body, which is easy for practitioners in this field to compress the stent body as a whole and deliver it into the introduction sheath from the distal end of the stent body.

[0056] In one specific embodiment, there is a developing section 2 between the tumor neck support section 1 and the anchoring blood vessel section 3. The developing section 2 is composed of two first annular support structures 10 connected together, and there are multiple connection points connecting the two first annular support structures 10 and multiple middle developing mounting parts 300 between the two first annular support structures 10. The connection points and the middle developing mounting parts 300 are arranged adjacent to each other in the circumferential direction of the developing section 2, and the developing body 500 is a radiopaque spring coil or metal ring, which is arranged on the middle developing mounting part 300.

[0057] In this embodiment, a developing segment 2 is additionally provided between the tumor neck support segment 1 and the anchoring blood vessel segment 3. The location of the developing segment 2 makes it easy to observe the state of the periphery of the diseased body and the position of the tumor neck from the proximal and distal ends of the tumor neck, and is more conducive to the surgeon to more clearly judge the real-time situation during the operation. The developing blood vessel stent with a middle open loop of the present application is developed at the distal and proximal ends of the tumor neck in conjunction with the introduction sheath. After being delivered to the position, the blood vessel stent is released in situ. The in situ release means that the tumor neck support segment 1 corresponds exactly to the axial opening position of the tumor neck on the blood vessel.

[0058] It should be pointed out here that the connection point referred to in this application is the intersection point where the first support rod 100 is connected end to end, and the installation point of the middle developing mounting portion 300 referred to in this application is also the intersection point where the first support rod 100 is connected end to end.

[0059] More specifically, the developing section 2 is specifically composed of two adjacent first annular support structures 10 connected in the axial direction, and the adjacent first annular support structures 10 have two different structures:

[0060] The first type is a connection point where the intersection points of two first annular support structures 10 are directly connected;

[0061] The second type is a middle developing mounting portion 300 for mounting the developing body 500 thereon;

[0062] That is, the connection point and the developing body 500 are circumferentially adjacently arranged between the two first annular structures, so that the developing body has a larger developing area and still has good structural strength.

[0063] In one specific embodiment, the middle developing mounting portion 300 is a straight rod-shaped structure, and the middle developing mounting portion 300 and the axial direction of the bracket body are arranged parallel to each other.

[0064] In this embodiment, the central imaging mounting portion 300 is a solid straight rod-shaped structure, specifically a solid rod-shaped structure, and the imaging body 500 is mounted and fixed on the central imaging mounting portion 300. The central imaging mounting portion 300 is parallel to the axial direction of the stent body to enable the operator to observe the maximum imaging area from outside the body.

[0065] In one specific embodiment, the middle developing mounting portion 300 can be a hollow rod-shaped structure with grooves and hollow grooves inside. After the developing body 500 is mounted and fixed on the middle developing mounting portion 300, the developing body 500 can be further pressed into the groove of the middle developing mounting portion 300 through processing, thereby increasing the contact area between the developing body 500 and the middle developing mounting portion 300, thereby improving the connection strength between the two.

[0066] In one specific embodiment, the developing body 500 is a spring coil or metal ring made of non-radiopaque material. After the spring coil or metal ring is fixed on the middle developing mounting part 300, it can be fixed on the middle developing mounting part 300 by laser welding or gluing.

[0067] In one specific embodiment, one end of the middle developing mounting portion 300 is a fixed end connected to the first annular support structure 10 on one side, and the other end is a free end not in contact with the first annular support structure 10 on the other side.

[0068] More specifically, in one embodiment, the alternately arranged middle developing mounting portions 300 are fixed to the first annular supporting structure 10 on the same side.

[0069] In this embodiment, one end of the middle developing mounting portion 300 serves as a fixed end and is connected to the first annular support structure 10 on one side, and the other end is a free end, and the middle developing mounting portion 300 does not contact the first annular support structure 10 on this side, so that the implementers in this field can mount and fix the developing body 500 on the middle developing mounting portion 300 during processing.

[0070] In one specific embodiment, the intermediate developing mounting portions 300 arranged alternately are fixed to the first annular supporting structure 10 located on the opposite side, and the developing body 500 is staggered in the axial direction of the developing section 2 .

[0071] In this embodiment, the middle developing mounting portion 300 is located on the opposite side. After the developing body 500 is installed, the developing body 500 is axially spaced and staggered in the developing section 2, which fully increases the developing area. After the stent body is released, it is convenient to observe the opening and wall-attached state of the open-loop vascular stent of the present application at the tumor diameter, so that the surgeon can better adjust the operation.

[0072] In summary, the alternately arranged middle developing mounting parts 300 referred to in this article are: two middle developing mounting parts 300 are arranged with a connection point between them, and these two middle developing mounting parts 300 can be fixed to the first annular support structure 10 located on the same side, or can be located on the first annular support structure 10 on opposite sides. Compared with the middle developing mounting parts 300 fixed to the same side, the observable developing area is improved, so that the surgeon can observe the internal condition of the patient more clearly.

[0073] In one specific embodiment, the fixed end of the middle developing mounting portion 300 is fixed to one side of the first annular support structure 10 adjacent to the other side of the first annular support structure 10, and the middle developing mounting portion 300 is connected to the intersection position of the first support rod 100 where the end is connected.

[0074] In this embodiment, the length of the two first support rods 100 provided with the developing mounting portion on the developing section 2 is shorter than the length of the two first support rods 100 intersecting to form a connection point, thereby providing a larger space for the rod-shaped middle developing mounting portion 300 and providing more sufficient installation space for practitioners in this field to install the developing body 500.

[0075] In one specific embodiment, the middle developing mounting portion 300 is symmetrically arranged on the two first annular support structures 10, and there is a mounting gap between the two opposite middle developing mounting portions 300. The middle developing mounting portion 300 is connected to the intersection position where the first support rod 100 is connected end to end, and the developing body 500 is passed through the two oppositely arranged middle developing mounting portions 300.

[0076] In this embodiment, on the two first annular support structures 10, the middle developing mounting portion 300 is symmetrically arranged in the radial direction of the vascular stent, and there is an installation gap between the two symmetrically arranged middle developing mounting portions 300. The setting of the installation gap makes it easy for practitioners in this field to install the developing body 500. This symmetrical setting increases the developing length in the axial direction of the vascular stent, making its developing length twice the length of the middle developing mounting portion 300 set on one side.

[0077] In one specific embodiment, the number of the developing bodies 500 in the circumferential direction of the developing section 2 is four.

[0078] In this embodiment, preferably, the four developing bodies 500 are evenly arranged in the circumferential direction of the developing section 2 , that is, the angle between the line connecting two adjacent developing bodies 500 and the axis of the blood vessel stent is 90°.

[0079] In one specific embodiment, the axial length of the tumor neck support segment 1 is within [4 mm, 10 mm].

[0080] In this embodiment, the length of the tumor neck support section 1 should be adapted to the length of the tumor neck, so as to effectively support the tumor neck.

[0081] Preferably, the tumor neck support section 1 with an axial length of the vascular stent within [4 mm, 10 mm] can adapt to and treat the tumor 4 in most cases and play an effective supporting role.

[0082] In one specific embodiment, the first support rod 100 is a straight rod structure, and the straight length of the first support rod 100 is within [1.2 mm-2.5 mm].

[0083] In one specific embodiment, the included angle between two adjacent first supporting rods 100 in the same group is within the range of [40°-100°].

[0084] In one specific embodiment, the second support rod 200 is a straight rod structure, and the straight length of the second support rod 200 is within [0.7 mm-2 mm].

[0085] In one specific embodiment, the included angle between two adjacent second supporting rods 200 in the same group is within [35°, 90°].

[0086] In the above embodiment, the angle between two adjacent first struts 100 and two adjacent second struts 200 within the same group is primarily designed to accommodate blood vessels of varying thicknesses. While ensuring equal circumferential length, the smaller the angle between two adjacent, end-to-end first struts 100, the smaller the stent diameter; the larger the angle between adjacent struts, the larger the stent diameter. Similarly, the diameter of adjacent, end-to-end second struts 200 can be adjusted by cutting the same tubing, then expanding and heat-setting it. Both methods can be directly implemented using existing technologies and are not further described herein.

[0087] In one specific embodiment, the shortening rate of the stent body is between 6% and 15%.

[0088] In this embodiment, the shortening rate of the stent body refers to the axial compression amount of the open-loop imaging vascular stent in the middle of this application from the normal compression to the compressed state after the sheath is introduced, which accounts for the proportion of the axial length of the stent body under normal conditions, and is between 6% and 15%.

[0089] In one specific embodiment, both ends of the stent body have flared structures 600 , and the angle between the flared structures 600 and the axial direction of the stent body is within [30°, 60°].

[0090] In this embodiment, the expansion structure 600 is arranged so that when the vascular stent is in a compressed state before being released, the expansion structure 600 tends to extend parallel to the introduction sheath. Therefore, after the vascular stent is released, the expansion structure 600 is more conducive to anchoring the vascular segment 3 away from the end of the tumor neck support segment 1, and is more stably and firmly anchored on the inner wall of the blood vessel.

[0091] In one specific embodiment, an end display mounting portion 400 is provided outwardly from one end of the anchoring blood vessel segment 3 away from the tumor neck support segment 1 , and the display body 500 is provided on the end display mounting portion 400 .

[0092] In this embodiment, an end developing mounting portion 400 is provided outwardly at one end of the anchoring vascular segment 3 away from the tumor neck support segment 1. It should be pointed out here that the structure of the end developing mounting portion 400 can be exactly the same as the middle developing mounting structure, with only a different setting position. It can also be slightly different from the structure of the middle developing mounting portion 300. It is only necessary to ensure that the developing body 500 can be stably and firmly mounted thereon, so that the end of the anchoring vascular segment 3 away from the tumor neck support segment 1 also has a developing body 500, so that the surgeon can observe the positions of the two ends of the middle open-loop developing vascular stent of this application from the outside of the patient's body, and determine whether the two ends of the vascular stent can be anchored on the inner wall of the blood vessel on both sides of the tumor body 4 respectively. No further specific restrictions are made.

[0093] In one specific embodiment, the sum of the first annular support structure 10 and the second annular support structure 20 in the tumor neck support segment 1 is an odd number.

[0094] In one specific embodiment, the total number of the first annular support structure 10 and the second annular support structure 20 in the tumor neck support segment 1 is 3 or 5 sections.

[0095] In this embodiment, the first annular support structure 10 and the second annular support structure 20 within the aneurysm ostium support section preferably have a total of three or five sections. After the stent is released, the two middle groups of imaging sections 2 are located at the proximal and distal ends of the aneurysm ostium, respectively. A three-section combination is suitable for tumors 4 with an orifice of 4-6 mm, while a five-section combination is suitable for tumors 4 with an orifice of 6-10 mm. This large-rod and small-rod combination of the first and second struts 100, 200 results in a higher density of mesh in the aneurysm ostium support section 1 relative to the proximal and distal imaging regions, providing better support for the coils within the aneurysm 4.

[0096] 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 developing vascular stent with an open middle ring, characterized in that: including a bracket body; The bracket body includes a first annular support structure and a second annular support structure; The first annular support structure is a group of first support rods connected end to end to form an annular structure; The second annular support structure is a group of second support rods connected end to end to form an annular structure; The axial length of the first annular support structure is greater than the axial length of the second annular support structure, and the circumferences of the two are equal. The first annular support structure and the second annular support structure are alternately arranged along the axial direction thereof to form an open ring structure therebetween. The multiple segments of the first annular support structure and the multiple segments of the second annular support structure integrally constitute an aneurysm neck support segment located at the aneurysm ostium, and anchoring blood vessel segments respectively connected to the distal end and the proximal end of the aneurysm neck support segment; There is a developing segment between the tumor neck support segment and the anchoring blood vessel segment; The developing section is composed of two first annular support structures connected together, and there are multiple connection points and multiple middle developing mounting parts between the two first annular support structures; The developing body is arranged on the middle developing mounting portion; The ratio of the number of the first supporting rods in one group to the number of the second supporting rods in one group is 2:3; The connection points and the middle developing mounting portions are alternately arranged in a circumferential direction of the developing section.

2. The imaging vascular stent with a middle open ring according to claim 1, characterized in that: The middle developing mounting portion is a straight rod-shaped structure, and the middle developing mounting portion and the axial direction of the bracket main body are arranged parallel to each other.

3. The imaging vascular stent with a middle open ring according to claim 1, characterized in that: One end of the middle developing mounting portion is a fixed end connected to the first annular support structure on one side, and the other end is a free end not in contact with the first annular support structure on the other side; Among them, the alternately arranged middle developing mounting parts are fixed to the first annular support structure located on the same side; or the alternately arranged middle developing mounting parts are fixed to the first annular support structure located on the opposite side, and the developing body is axially staggered in the developing section.

4. The imaging vascular stent with a middle open ring according to claim 3, characterized in that: The fixed end of the middle developing mounting portion is fixed to one side of the first annular supporting structure adjacent to the other side of the first annular supporting structure, and the middle developing mounting portion is connected to the intersection position where the first supporting rods are connected end to end.

5. The imaging vascular stent with a middle open ring according to claim 1, characterized in that: The middle developing mounting portion is symmetrically arranged on the two first annular supporting structures, and there is a mounting gap between the two opposite middle developing mounting portions; The middle developing mounting portion is connected to the intersection of the first supporting rods where the ends are connected; The developing body is passed through the two middle developing mounting parts that are arranged opposite to each other.

6. The imaging vascular stent with a middle open ring according to claim 1, characterized in that: The developing bodies are radiopaque spring coils or metal rings, and there are four of them. The developing bodies are evenly distributed in the circumferential direction of the developing section.

7. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: Two adjacent second annular support structures are connected to form a closed loop structure, and one end of at least one anchoring blood vessel segment that is not connected to the tumor neck support segment has the closed loop structure.

8. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: The axial length of the tumor neck support section is within [4mm, 10mm].

9. The imaging vascular stent with a middle open ring according to claim 8, characterized in that: The sum of the first annular support structure and the second annular support structure in the tumor neck support segment is an odd number of segments.

10. The imaging vascular stent with a middle open ring according to claim 8, characterized in that: The total number of the first annular support structure and the second annular support structure in the tumor neck support segment is 3 or 5.

11. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: The first support rod is a straight rod structure, and the straight length of the first support rod is within [1.2mm-2.5mm].

12. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: The included angle between two adjacent first supporting rods in the same group is within the range of [40°-100°].

13. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: The second support rod is a straight rod structure, and the straight length of the second support rod is within [0.7 mm-2 mm].

14. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: The included angle between two adjacent second supporting rods in the same group is within [35°, 90°].

15. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: The shortening rate of the stent body is between 6% and 15%.

16. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: Both ends of the bracket body have flared structures, and the angle between the flared structure and the axial direction of the bracket body is within [30°, 60°].

17. The imaging vascular stent with a middle open ring according to any one of claims 1 to 6, characterized in that: An end display mounting portion is provided outwardly at one end of the anchoring blood vessel segment away from the tumor neck support segment, and the second display body is provided on the end display mounting portion.

Images