Tubular stent with auxiliary structure inside and stent system comprising tubular stent
By setting up a multi-point connection auxiliary structure on the tubular stent and distributing the projection of its connecting ends, the problem of reduced conveying smoothness of the stent in the catheter is solved, and the connection stability and therapeutic effect are improved.
Patent Information
- Application Number
- CN202322998416.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-07
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2033-11-07
AI Technical Summary
When the prior art is equipped with auxiliary structures for tubular stents, the smoothness of the stent transport in the catheter is reduced, the deformation increases, and the treatment effect is affected.
A tubular bracket with an auxiliary structure inside is designed. By providing a multi-point connection auxiliary structure on the support body and dislocation of projections at different connection ends, the radial dimensions at the connection points are reduced, thereby reducing the transport resistance.
The connection stability of the auxiliary structure on the stent body is improved, the delivery resistance is reduced, the deformation of the stent after release at the lesions is improved, and the treatment effect is improved.
Smart Images
Figure CN222517081U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of vascular stents, and in particular relates to a tubular stent with an auxiliary structure inside and a stent system containing the same. Background Art
[0002] A tubular stent is a hollow stent with a tubular extension, which is often used as an interventional or implantable device to enter the vascular system. For interventional medical devices, in order to increase the functionality of the tubular stent (such as visibility, auxiliary scraping of thrombus, radial support, etc.), the prior art will choose to set an auxiliary structure inside the tubular stent. The tubular stent needs to be radially compressed and loaded inside the catheter, transported to the lesion along with the catheter, and released near the lesion by pushing and / or pulling. Since pushing and / or pulling are required multiple times near the lesion, the transportation resistance of the tubular stent inside the catheter affects the smoothness of pushing or pulling. The lower the smoothness of the tubular stent during transportation in the catheter, the greater the deformation caused to the tubular stent, and the worse the therapeutic effect of the tubular stent after being released at the lesion.
[0003] Take the thrombectomy stent as an example. The thrombectomy stent is used to capture thrombi (i.e., blood clots) from the vascular system (such as blood vessels in the brain) and remove the thrombi from the affected blood vessels, thereby restoring normal flow between the blood vessels and preventing further tissue necrosis. During clinical operations, in order to ensure that clinicians deploy the device in the correct position to capture thrombi, radiopaque mechanisms, auxiliary thrombus scraping, auxiliary thrombus fragmentation or other functional mechanisms are often set on the thrombectomy stent. The lower the smoothness of the thrombectomy stent during delivery in the catheter, the greater the deformation, and the worse the thrombus capture effect of the thrombectomy stent after it is released at the lesion.
[0004] Therefore, how to provide an auxiliary structure on a tubular stent while reducing the impact on the smoothness of the delivery of the tubular stent is a technical problem that needs to be solved in the art. Summary of the invention
[0005] In view of the shortcomings of the prior art, one of the purposes of the present invention is to provide a tubular bracket with an auxiliary structure inside, the tubular bracket comprising:
[0006] The stent body has a hollow grid on the wall;
[0007] An auxiliary structure having at least two connection ends and an auxiliary rod connecting the connection ends, wherein the connection ends are connected to the grid of the hollow grid;
[0008] The projections of different connection ends in the auxiliary structure to the axial direction of the bracket body do not overlap.
[0009] The present application sets the auxiliary structure to have at least two connection ends, so as to obtain the effect of multi-point connection with the bracket body, and improve the connection stability of the auxiliary structure to the bracket body. The connection part between the auxiliary structure and the bracket body can be achieved by bonding, sleeve connection, welding, etc., but no matter which method is used, the radial dimension of the connection part is often larger than that of a single hollow grid support or auxiliary rod of the auxiliary structure, and this increase in radial dimension will be multiplied due to multi-point connection. The present application sets the projections of different connection ends in the auxiliary structure to the axial direction of the bracket body to be non-overlapping, so as to axially stagger the connection parts, so as to solve the problem of multi-point connection causing the exponential increase of radial dimensions at the connection points. The connection end is defined as the part used to connect to the bracket body.
[0010] There may be one or more auxiliary rods connecting the connection ends.
[0011] During clinical operations, in order to ensure that clinicians deploy the device in the correct position to achieve the surgical purpose (such as capturing blood clots or dilating intracranial stenosis), a radiopaque mechanism or other functional mechanism is often set on the stent. The auxiliary structure described in this application can be set to a radiopaque material to achieve a visual effect, or other materials can be selected to obtain the corresponding functional mechanism.
[0012] Preferably, the auxiliary structure further includes an extension end away from the connecting end, and the auxiliary rod simultaneously connects the connecting end and the extension end, and the extension end is arranged inside the bracket body.
[0013] The arrangement of the extension end enables the auxiliary structure to be located inside the stent body without extending outside the stent body. This arrangement can reduce the damage of the stent to the inner wall of the blood vessel.
[0014] In a specific embodiment, the auxiliary structure includes a plurality of auxiliary rods, each of which has a connecting end, and the other ends of all the auxiliary rods converge into an extension end. This arrangement can increase the radial support force of the tubular stent and increase its firmness of binding with the thrombus.
[0015] Preferably, the extending end faces the distal end or the proximal end of the stent body.
[0016] More often, the extension end faces the distal end of the stent body.
[0017] Preferably, the tubular stent further comprises an extension column integrally designed with the stent body, the extension column is parallel to the axial direction of the stent body, and the distal end of the extension column extends into the interior of the hollow grid along the tube wall direction.
[0018] Compared with directly connecting the auxiliary structure to the pillars of the hollow grid, the extension column provided in the present application can provide a variety of connection methods for the auxiliary structure, such as head-to-head connection, end overlapping and sleeve connection, etc., and can design the radial dimension of the connection part to minimize the increase in the radial dimension of the tubular stent, and will not increase excessive transportation resistance when transported in the catheter.
[0019] The extension column is a part of the bracket body.
[0020] Preferably, the plane perpendicular to the axial direction where the connecting end is located is defined as the G plane; the different connecting ends in the auxiliary structure are arranged from near to far according to the distance from the proximal end of the stent body, and the G planes of the different connecting ends are G n Surface, wherein n is the sequence number in the sorting;
[0021] The G n Face with the G n+1 The distance between the faces is L n ;
[0022] The length of the connection end is less than L n .
[0023] In the connection ends with similar axial positions, the length of the connection ends is less than that of the G n Face with the G n+1 The distance between the surfaces L n , it is possible to make the axial projections of the connection ends non-overlapping, that is, to arrange the connection ends of the multi-point connections in a staggered manner, thereby solving the problem of the exponential increase in the radial dimensions of the connection parts caused by the multi-point connection of the auxiliary structure.
[0024] Preferably, the connecting end comprises an end portion of the auxiliary rod and an annular sleeve component sleeved on the end portion of the auxiliary rod, and the length of the annular sleeve component along the axial direction is the length of the connecting end.
[0025] Preferably, the proximal end of the extension column is arranged on the grid of the hollow grid, and the distal end extends into the hollow hole of the hollow grid.
[0026] The proximal end and the distal end of the same extension column are located in the same hollow structure of the hollow grid.
[0027] Preferably, the meshes of the hollow grid are formed by grid columns intersecting each other, and the proximal ends of the extension columns are arranged at the intersections of the hollow grids.
[0028] Preferably, the annular sleeve component is an annular sleeve component of a radiopaque material.
[0029] Preferably, the extension end is provided with a radiopaque component.
[0030] The radiopaque component includes any one of an annular radiopaque annular sleeve, a radiopaque coil, and a radiopaque clip, or a combination of at least two of them.
[0031] Preferably, the tubular stent comprises an auxiliary structure, and the auxiliary structure is arranged at the distal end of the stent body.
[0032] In the visualization of tubular stents, in order to know whether the landing point of the distal end of the stent is appropriate and whether it is in the position required for surgery (such as the distal end of a thrombus or a stenosis of an intracranial blood vessel), it is usually required to develop the distal end of the stent, so at least an auxiliary structure is set at the distal end of the stent body.
[0033] Preferably, the tubular stent comprises at least two auxiliary structures, wherein one auxiliary structure is arranged at the distal end of the stent body, and the remaining auxiliary structures are axially arranged near a point where the distance between the proximal end and the distal end of the tubular stent is equally divided.
[0034] The auxiliary structure of the tubular stent described in the present application is at least one auxiliary structure disposed at the distal end of the stent body, and the remaining auxiliary structures are evenly distributed on the stent body.
[0035] Preferably, after the auxiliary rods of the auxiliary structure are projected onto a cross section perpendicular to the axial direction, the included angles of the projections of adjacent auxiliary rods are the same.
[0036] Preferably, the tubular stent is a thrombus removal stent.
[0037] The second object of this application is to provide a support system, comprising:
[0038] The tubular stent as described in one of the purposes;
[0039] A push wire connected to the proximal end of the tubular stent;
[0040] A catheter is used to deliver the tubular stent.
[0041] Compared with the prior art, this application has the following beneficial effects:
[0042] The tubular stent with an auxiliary structure inside provided by the present application connects the auxiliary structure to the stent body at multiple points to improve the connection stability of the auxiliary structure. The projections of the different connection ends to the axial direction of the stent body described in the present application are set to be non-overlapping, which solves the problem of exponential increase in radial dimensions at the connection points caused by multi-point connection. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] Figure 1 A schematic structural diagram of a specific implementation of a tubular support having an auxiliary structure inside;
[0044] Figure 2Schematic diagram of the structure of the first annular sleeve component 241. DETAILED DESCRIPTION
[0045] The following is a further explanation of the technical solution of the utility model in conjunction with the specific implementation method. However, it should be noted that the specific implementation method is only a specific implementation and explanation of the essence of the technical solution of the utility model, and should not be understood as a limitation on the protection scope of the utility model. It should also be noted that for the convenience of description, only the parts related to the utility model are shown in the drawings.
[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0047] In the description of the present application, it should be understood that the terms "distal end" and "proximal end" should be understood as viewed from the direction of the surgical operator, the "distal end" is the end away from the surgical operator, and the "proximal end" is the end close to the surgical operator. The term "axial" should be understood as the direction of stent pushing or the length of the guidewire, "radial" should be understood as the perpendicular direction of the "axial direction", and "circumferential" should be understood as the circumferential direction, that is, the direction around the length of the stent, that is, perpendicular to the axial direction and perpendicular to the cross-sectional radius.
[0048] In the description of this application, it should be noted that the embodiments and features in the embodiments of this application can be combined with each other without conflict. Figure 1 ( Figure 1 As shown in the structural schematic diagram of a specific embodiment of a tubular stent with an auxiliary structure inside, a tubular stent with an auxiliary structure inside comprises:
[0049] The stent body 100 has a hollow grid on its wall, and the holes 101 of the hollow grid are surrounded by struts 102 connected end to end, and the connection point of the struts 102 is an intersection 120, and the struts 102 as a whole form a grid 110; the stent body 100 is also provided with three extension columns, a first extension column 131, a second extension column 132 and a third extension column 133, and the proximal end of each of the extension columns is arranged on the intersection 120 of the grid 110 of the hollow grid, and the distal end of the extension column extends to the hole 101 of the hollow grid where the proximal end of the corresponding extension column is located.
[0050] The auxiliary structure 200 has three connection ends, a first connection end 211, a second connection end 212 and a third connection end 213, and three auxiliary rods respectively connecting the three connection ends, a first auxiliary rod 221, a second auxiliary rod 222, and a third auxiliary rod 223. The distal ends of the three auxiliary rods converge into an extension end 230, and the extension end 230 is arranged inside the bracket body 100. The first connection end 211 is connected to the distal end of the first extension column 131, the second connection end 212 is connected to the distal end of the second extension column 132, and the third connection end 213 is connected to the distal end of the third extension column 133; the extension end 230 extends toward the distal end of the bracket body 100. The first connecting end 211 includes the proximal end of the first auxiliary rod 221 and a first annular sleeve part 241 arranged on the outer periphery of the first auxiliary rod 221, the second connecting end 212 includes the proximal end of the second auxiliary rod 222 and a second annular sleeve part (not shown in the figure) arranged on the outer periphery of the second auxiliary rod 222, and the third connecting end 213 includes the proximal end of the third auxiliary rod 223 and a third annular sleeve part (not shown in the figure) arranged on the outer periphery of the third auxiliary rod 223. Figure 2 ( Figure 2 2 is a schematic diagram of the structure of the first annular sleeve component 241. Only the first annular sleeve component 241 is taken as an example for description. The structures of the second annular sleeve component and the third annular sleeve component are the same as that of the first annular sleeve component 241.
[0051] The projections of the first connection end 211, the second connection end 212 and the third connection end 213 in the auxiliary structure 200 to the axial direction of the stent body do not overlap with each other, and the connection ends are arranged from near to far in order of the distance from the proximal end of the stent body, namely the first connection end 211, the second connection end 212 and the third connection end 213, and the distance between the first connection end 211 and the second connection end 212 is L 1 , the distance between the second connection end 212 and the third connection end 213 is L 2 The length of the first annular sleeve component 241 along the axial direction is ≤L 1 , the axial length of the second annular sleeve member 242 is ≤L 2 .
[0052] The auxiliary structure is made entirely of radiopaque material and plays a role in visualization during clinical operations.
[0053] In other implementations, the proximal end of the extension column may be optionally disposed on the support column 102 of the hollow grid frame 110.
[0054] In other specific embodiments, the number of connection ends can be 2, 4, 5 or other numbers, and a corresponding number of auxiliary rods need to be set accordingly. In the example of setting an extension column, the number of extension columns should also be increased accordingly. The added connection ends need to meet the requirement that the projections to the axial direction of the stent body do not overlap, and more preferably meet the requirement that after being sorted from near to far in terms of distance from the proximal end of the stent body, the distance between two connection ends with similar distances is greater than the length of the free ends between the two ends close to the proximal end.
[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A tubular stent with an auxiliary structure inside, characterized in that: The tubular support comprises: The stent body has a hollow grid on the wall; An auxiliary structure having at least two connection ends and an auxiliary rod connecting the connection ends, wherein the connection ends are connected to the grid of the hollow grid; The projections of different connection ends in the auxiliary structure to the axial direction of the bracket body do not overlap.
2. The tubular stent according to claim 1, characterized in that: The auxiliary structure also includes an extension end away from the connecting end, and the auxiliary rod connects the connecting end and the extension end at the same time, and the extension end is arranged inside the bracket body.
3. The tubular stent according to claim 2, characterized in that: The extending end faces the distal end or the proximal end of the stent body.
4. The tubular stent according to claim 1, characterized in that: The tubular stent also includes an extension column designed integrally with the stent body, the extension column is parallel to the axial direction of the stent body, and the distal end of the extension column extends into the hollow grid along the tube wall direction.
5. The tubular stent according to claim 1, characterized in that: The plane perpendicular to the axial direction where the connecting end is located is defined as the G plane; the different connecting ends in the auxiliary structure are arranged from near to far according to the distance from the proximal end of the stent body, and the G planes of the different connecting ends are G n Surface, wherein n is the sequence number in the sorting; The G n Face with the G n+1 The distance between the faces is L n ; The length of the connection end is less than L n .
6. The tubular stent according to any one of claims 1 to 4, characterized in that: The connecting end comprises an end of the auxiliary rod and an annular sleeve component sleeved on the end of the auxiliary rod, and the length of the annular sleeve component along the axial direction is the length of the connecting end.
7. The tubular stent according to claim 4, characterized in that: The proximal end of the extension column is arranged on the grid of the hollow grid, and the distal end extends into the hollow hole of the hollow grid.
8. The tubular stent according to claim 4, characterized in that: The meshes of the hollow grid are formed by the grid columns intersecting each other, and the proximal ends of the extension columns are arranged at the intersections of the hollow grid.
9. The tubular stent according to claim 6, characterized in that: The annular sleeve component is an annular sleeve component of a radiopaque material.
10. The tubular stent according to claim 6, characterized in that: The auxiliary structure is entirely made of radiopaque material.
11. The tubular stent according to claim 2, characterized in that: The extension end is provided with a radiopaque component.
12. The tubular stent according to claim 1, wherein: The tubular stent includes an auxiliary structure, and the auxiliary structure is arranged at the distal end of the stent body.
13. The tubular stent according to claim 1, characterized in that: The tubular stent comprises at least two auxiliary structures, one of which is arranged at the distal end of the stent body, and the remaining auxiliary structures are arranged axially near a point where the distance between the proximal end and the distal end of the tubular stent is equally divided.
14. The tubular stent according to claim 1, characterized in that: After the auxiliary rods of the auxiliary structure are projected onto a cross section perpendicular to the axial direction, the included angles of the projections of adjacent auxiliary rods are the same.
15. The tubular stent according to claim 1, characterized in that: The tubular stent is a thrombus removal stent.
16. A support system, characterized in that: The support system comprises: The tubular stent according to any one of claims 1 to 15; A push wire connected to the proximal end of the tubular stent; A catheter is used to deliver the tubular stent.