阅读说明：本技术 一种可组合套接使用的血管支架 (Combined sleeve-joint intravascular stent ) 是由 刘爱华 佟鑫 冯欣 陈吉钢 彭飞 牛昊 缪中荣 李佑祥 于 2020-12-29 设计创作，主要内容包括：一种可组合套接使用的血管支架,其包括外层骨架支架,内层治疗支架；其特征在于,骨架支架为大网眼不影响血流的支架,治疗支架为设置在骨架支架内,为找准位置撑开后固定在骨架支架特定位置的支架；治疗支架上设置保证内层支架撑开后不发生位置移动的防位移结构；骨架支架设置为一个,内层支架设置为一个或多个相同或不同的支架。针对不同的血管位置选择合适的骨架支架,并在手术前或手术中根据血管的病变情况选择一个或多个相同或不同的治疗支架。(A combined sleeve-joint intravascular stent comprises an outer-layer framework stent and an inner-layer treatment stent; the device is characterized in that the framework bracket is a bracket with large meshes and without influencing blood flow, and the treatment bracket is a bracket which is arranged in the framework bracket and is fixed at a specific position of the framework bracket after being expanded for finding the position; the treatment bracket is provided with a displacement prevention structure which ensures that the position of the inner bracket does not move after the inner bracket is unfolded; the framework support is arranged into one support, and the inner-layer support is arranged into one or more same or different supports. Selecting proper skeleton support for different blood vessel positions, and selecting one or more same or different treatment supports according to the pathological condition of the blood vessel before or during operation.)

1. A combined sleeve-joint intravascular stent comprises a skeleton stent at the outer layer and a treatment stent at the inner layer; the device is characterized in that the framework bracket is a bracket with large meshes and without influencing blood flow, and the treatment bracket is a bracket which is arranged in the framework bracket and is fixed at a specific position of the framework bracket after being expanded for finding the position; the treatment bracket is provided with a displacement prevention structure which ensures that the position of the inner bracket does not move after the inner bracket is unfolded; the framework support is arranged into one support, and the inner-layer support is arranged into one or more same or different supports.

2. The combinable sleeved blood vessel stent of claim 1, wherein the meshes of the skeleton stent are circular meshes, the diameter of the meshes is larger than 1/5 of the diameter of the implanted blood vessel; or the meshes of the framework stent are quadrilateral meshes, and the length of the short diagonal line of the quadrilateral meshes is greater than 1/5 of the caliber of the blood vessel.

3. The combinable, telescoping use, vascular stent of claim 2 wherein the mesh area of the therapeutic stent is less than 1/3 of the mesh area of the skeletal stent.

4. The combinable and nestable vascular stent of claim 2, wherein the two ends of the stent are integrally provided with anchoring stents having a greater expansion size than the main body of the stent, and the pressure-bearing capacity of the framework of the anchoring stent portion is greater than that of the framework stent.

5. The combinable, telescoping use, vascular stent of claim 1 wherein when the diseased vessel is in the vicinity of a branch vessel; the framework stent is a long stent, and the treatment stent is a treatment stent which is arranged in the framework stent and does not cover the branch blood vessel near the branch blood vessel.

6. The combinable, telescoping-usable vascular stent of claim 1, wherein a plurality of identical therapeutic stents are disposed within a single skeletal stent when a plurality of adjacent identical lesion sites are present within a single lesion vessel.

7. The combinable, telescoping-usable blood vessel stent of claim 1, wherein a plurality of different therapeutic stents are provided within a single skeletal stent when a plurality of adjacent and different lesion sites exist within a single lesion vessel.

8. The blood vessel support capable of being sleeved and used in combination according to any one of claims 5 to 7, wherein the anti-displacement structure is a protruding structure arranged at the inner side of the skeleton support, and the protruding structure is contacted with the support wall of the treatment support to effectively prevent mutual sliding; or the displacement prevention structure is a protruding structure arranged on the outer side of the support wall of the treatment support, and the protruding structure is in close contact with the support wall of the framework support.

9. The blood vessel support capable of being sleeved and used in combination according to claim 8, wherein the inner side of the framework support wall or the outer side of the treatment support wall is provided with a plurality of rows of the protruding structures, the longitudinal distance between every two adjacent protruding structures is equal, and each row of the protruding structures is arranged along the meshes of the same longitudinal row and is arranged on the corresponding mesh edge.

10. The combinable, telescoping-usable vascular stent of claim 1, wherein the skeletal stent is a stent disposed in a cerebral vessel or a stent disposed in a diseased vessel with a vascular dissection.

Technical Field

The invention belongs to the technical field of intravascular stent instruments, and particularly relates to an intravascular stent capable of being combined and sleeved for use.

Background

The pathological change tissue that often can have a many places pathological change positions in a blood vessel or be close to branch department in the present operation process, if insert longer blood vessel support then can influence unobstructed degree of blood flow because the mesh of blood vessel support is denser, if select shorter support then can have the problem that the support easily moved away from the pathological change position, it is not obvious to directly select the support effect of the great support of mesh to the pathological change position of choosing for use, pathological change tissue overflows through big mesh easily, play the purpose of strutting the pathological change position, in addition if when involving using medicine and tectorial membrane support etc. the condition, the effect of using medicine of the support of great mesh is also very poor, the stability of tectorial membrane is also very poor.

At present, different lesion positions sometimes exist in one blood vessel, different lesion positions need different treatment modes to be treated frequently, and a single blood vessel stent is difficult to meet the treatment of the lesion positions in different treatment and treatment schemes. If a stent which needs to be placed for treating vascular stenosis exists at a position adjacent to a blood vessel, and a stent which needs to be used for treating aneurysm exists at another position, the structures, the film covering conditions, the medicine conditions and the like of the two stents are different, and different stents need to be placed in different times, but the implantation difficulty is large, and the time consumption is long.

In addition, a plurality of stents are required to be placed in an overlapped mode when the vascular interlayer is treated, the blood vessel is easily damaged at the joint of the stents, the stents placed in the overlapped positions of the stents in the overlapped mode are difficult to place, the difficulty in clinical development is high, and the requirement on the doctor technology is high.

Aiming at the problem that lesion positions exist on two sides of a branch blood vessel in the prior art, the stent is moved with great difficulty in implantation; a plurality of lesion positions exist in one blood vessel, and sometimes a plurality of different lesion positions exist, so that the treatment is difficult to be completed through one stent; the vascular stent which can be used in combination and sleeved is provided to solve the technical problems.

Disclosure of Invention

A combined sleeve-joint intravascular stent comprises a skeleton stent at the outer layer and a treatment stent at the inner layer; the device is characterized in that the framework bracket is a bracket with large meshes and without influencing blood flow, and the treatment bracket is a bracket which is arranged in the framework bracket and is fixed at a specific position of the framework bracket after being expanded for finding the position; the treatment bracket is provided with a displacement prevention structure which ensures that the position of the inner bracket does not move after the inner bracket is unfolded; the framework support is arranged into one support, and the inner-layer support is arranged into one or more same or different supports. Selecting proper skeleton support for different blood vessel positions, and selecting one or more same or different treatment supports according to the pathological condition of the blood vessel before or during operation.

Furthermore, meshes of the framework stent are circular meshes, and the diameter of the meshes is larger than 1/5 of the diameter of the implanted blood vessel; or the meshes of the framework stent are quadrilateral meshes, and the length of the short diagonal line of the quadrilateral meshes is greater than 1/5 of the caliber of the blood vessel.

Further, the mesh area of the therapeutic stent is no greater than 1/3 of the mesh area of the framework stent; this arrangement ensures both respective functions.

Furthermore, the framework stent is a non-tectorial membrane stent, the core of which plays a supporting role and can effectively prevent unsmooth blood flow.

Further, the main body of the framework stent is a uniform non-covered stent.

Further, the two ends of the framework support are integrally provided with anchoring supports which are expanded to be larger than the framework support main body, and the framework bearing capacity of the anchoring support part is larger than that of the framework support. The arrangement can effectively ensure the stability of the position of the framework bracket after being placed in and the stability of the structure after being propped open.

Furthermore, the treatment stent is a covered stent or a non-covered stent, and different treatment stents are selected according to the requirements of treatment positions.

Further, when the diseased vessel is near a branch vessel; the framework stent is a long stent, and the treatment stent is a treatment stent which is arranged in the framework stent and does not cover the branch blood vessel near the branch blood vessel.

Or when a plurality of adjacent identical lesion positions exist in a lesion blood vessel, a plurality of identical treatment stents are arranged in a framework stent.

Or when a plurality of adjacent different lesion positions exist in a lesion blood vessel, a plurality of different treatment stents are arranged in a skeleton stent.

Furthermore, the anti-displacement structure is a protruding structure arranged on the inner side of the framework bracket, and the protruding structure is contacted with the bracket wall of the treatment bracket to effectively prevent mutual sliding; or the anti-displacement structure is a protruding structure arranged on the outer side of the bracket wall of the treatment bracket, and the protruding structure is tightly contacted with the bracket wall of the skeleton bracket; through setting up in the outstanding structure of support wall contact, can effectively realize placing the aversion.

Further, the inner side of the framework support wall or the outer side of the treatment support wall is provided with a protruding structure, a plurality of rows of protruding structures are longitudinally arranged along the support, the longitudinal distance between every two adjacent protruding structures is equal, each row of protruding structures are arranged along the meshes of the same longitudinal row and are arranged on the corresponding meshes, the protruding structures can be guaranteed to be in contact with the inner side of the treatment support wall or the outer side of the framework support wall to the maximum extent by the arrangement, and the stability of entering the rear structure is guaranteed.

Furthermore, the protruding structures arranged on the inner side of the framework support wall are uniformly arranged along the side edge of the mesh; the protruding structures arranged on the treatment bracket are arranged on the upper and lower edges of the meshes. This arrangement ensures the effectiveness of the projection arrangement.

Further, 2-6 columns of protruding structures are arranged; the stability of the structures of the two after contact is ensured.

Or the outer side of the bracket wall of the treatment bracket is provided with regular small protrusions, and the inner side of the bracket wall of the framework bracket is provided with small recesses for accommodating the small protrusions. The arrangement can realize the position fixation of the treatment bracket in the framework bracket.

Furthermore, all the mesh edges of the framework support are provided with small recesses, the longitudinal distance between every two adjacent small recesses is the same, 2-4 rows of small protrusions are arranged on the treatment support, each row of small protrusions are arranged along the same row of meshes, and after all the structures are unfolded, the distance between every two small recesses is equal to the distance between every two small protrusions. This arrangement maximizes the contact of the tabs with the dimples.

Furthermore, the height of the small protrusions is smaller than the thickness of the framework support, and the arrangement can ensure that the injury to the blood vessel wall can be prevented on the premise of fixing the position.

Still alternatively, the anti-moving structure is a friction-increasing biomaterial layer arranged on the inner side of the framework stent wall or the outer side of the therapeutic stent wall, and the arrangement can also improve the contact stability between the relevant structures.

Still alternatively, the therapeutic stent includes anchoring portions on both sides that are larger than the therapeutic stent body; the meshes of the anchoring parts are equal to the meshes of the framework stent, and the edges of the anchoring parts extend into the vessel wall through the meshes of the framework stent; the arrangement has the anchoring effect in the framework bracket, and the stability of the whole structure and the position is ensured.

Further, the skeleton stent is a stent arranged in a blood vessel with a lesion of a plurality of lesion positions and a vascular interlayer beside a branch blood vessel of any lesion tissue, wherein the skeleton stent is preferably a stent arranged in a cerebral blood vessel, or a stent arranged in a lesion blood vessel with a vascular interlayer.

Furthermore, the treatment stent is a covered stent, and a drug coating for treating corresponding pathological changes is coated on the film of the covered stent.

Furthermore, the meshes of the treatment bracket are parallelogram meshes, wherein rhombic meshes are preferred; the vertexes of any two adjacent rhombuses are connected.

Alternatively, the therapeutic stent is a mesh formed by sine wave cross-linking.

Further, skeleton supports with different pipe diameters after being unfolded are arranged, the treatment supports are arranged in a matched mode, the skeleton supports with the proper pipe diameters are selected according to the circumferential diameter condition of the blood vessel at the pathological change position, and the treatment supports with the specific size are selected correspondingly.

Compared with the prior art, the stent has the advantages that the effective external skeleton stent and the internal treatment stent are adopted, the adjacent lesion parts with the same or different positions or the intervascular lesions can be effectively and quickly placed near the branches according to the lesion positions, a good treatment effect is achieved, and the problem of repeated placement is effectively solved.

Drawings

FIG. 1 is a schematic view of the overall structure of an embodiment of the present invention with three treatment stents;

FIG. 2 is a partially enlarged view of the framework stent and the therapeutic stent of the present invention;

FIG. 3 is a schematic view of the overall structure of the treatment stent of the present invention as a bare stent;

FIG. 4 is a schematic view of the overall structure of the framework support of the present invention;

FIG. 5 is a partial enlarged structural view of the protruded structure of the inner side of the frame support wall according to the present invention;

FIG. 6 is a partial enlarged structural view of the projecting structure of the outer side of the therapeutic stent wall according to the present invention;

FIG. 7 is a schematic structural view of a stent according to the present invention with an anchoring portion and a covering membrane;

in the figure, 1, a skeleton bracket; 11. a main body; 12. an anchor bracket; 2. a treatment support; 21. an anchor portion; 3. and (5) a protruding structure.

Detailed Description

Example 1A Combined vascular Stent for the treatment of cerebral vascular disorders

A combined blood vessel stent for treating cerebral vascular diseases comprises a skeleton stent 1 on the outer layer and a treatment stent 2 on the inner layer; the framework bracket 1 is a bracket with large meshes and without influencing blood flow, and the treatment bracket 2 is a bracket which is arranged in the framework bracket 1, is expanded for a positioning position and is fixed at a specific position of the framework bracket 1; the treatment bracket 2 is provided with a displacement prevention structure which ensures that the position of the inner bracket does not move after being unfolded; the framework support 1 is arranged into one support, and the inner layer support is arranged into one or more same or different supports. Selecting a proper skeleton stent 1 aiming at the condition of cerebral vessels, and selecting one or more same or different treatment stents 2 according to the pathological condition of the vessels before or during operation. The skeleton support 1 with different pipe diameters after being expanded is arranged, the treatment support 2 is arranged in a matched mode, the skeleton support 1 with the proper pipe diameter is selected according to the circumferential diameter condition of the blood vessel at the pathological change position of the brain blood vessel, and the treatment support 2 with the specific size is selected correspondingly.

The mesh shape of the framework bracket 1 is set in the following manner: the meshes of the framework bracket 1 are circular meshes, and the diameter of the meshes is larger than 1/5 of the diameter of the implanted blood vessel;

the other setting mode is as follows: the meshes of the framework stent 1 are quadrilateral meshes, and the length of the short diagonal line of the quadrilateral meshes is larger than 1/5 of the caliber of the blood vessel.

The meshes of the therapeutic stent 2 are parallelogram meshes, wherein rhombic meshes are preferred; the vertexes of any two adjacent rhombuses are connected. Alternatively, the therapeutic stent 2 is a mesh formed by sine wave cross-linking.

When the brain blood vessel position is operated, the mesh area of the treatment bracket 2 is equal to 1/3 of the mesh area of the framework bracket 1, and the arrangement ensures the respective functions of the two.

The whole skeleton support 1 is the non-tectorial membrane support, and main part 11 is even non-tectorial membrane support, and its core plays the supporting role, and can effectually prevent that the blood flow is not smooth.

The treatment stent 2 is a covered stent or a non-covered stent, and different treatment stents 2 are selected according to the requirements of treatment positions.

When cerebral vascular lesions are near branch vessels; the stent graft 1 of this embodiment is a long stent graft, and the treatment stent graft 2 is a treatment stent graft 2 which is arranged in the stent graft 1 and does not cover the branch blood vessel in the vicinity of the branch blood vessel.

When a plurality of adjacent identical lesion positions exist in a cerebral vasculopathy vessel, in the embodiment, a plurality of identical treatment stents 2 are arranged in a framework stent 1.

When a plurality of adjacent different lesion positions exist in a cerebral vasculopathy vessel, in the embodiment, a plurality of different treatment stents 2 are arranged in a framework stent 1.

The displacement prevention structure is a protruding structure 3 arranged on the inner side of the framework bracket 1, and the protruding structure 3 is contacted with the bracket wall of the treatment bracket 2 to effectively prevent mutual sliding; or the displacement prevention structure is a protruding structure 3 arranged on the outer side of the support wall of the treatment support 2, and the protruding structure 3 is tightly contacted with the support wall of the skeleton support 1; the placing displacement can be effectively realized through the protruding structures 3 arranged on the support wall for contact. The inner side of the wall of the framework support 1 or the outer side of the wall of the treatment support 2 is provided with the protruding structures 3, a plurality of rows of the protruding structures 3 are longitudinally arranged along the support, the longitudinal distance between every two adjacent protruding structures 3 is equal, each row of the protruding structures 3 are arranged along the meshes of the same longitudinal row and are arranged on the corresponding mesh edges, the arrangement can ensure that the protruding structures 3 contact the inner side of the wall of the treatment support 2 or the outer side of the framework support 1 to the maximum extent, and the stability of entering the rear structure is ensured. The protruding structures 3 arranged on the inner side of the wall of the framework bracket 1 are uniformly arranged along the side edge of the mesh; the projecting structures 3 arranged on the therapeutic support 2 are arranged on the upper and lower edges of the meshes. This arrangement ensures the effectiveness of the arrangement of the projection arrangements 3. 2-6 columns of the protruding structures 3 are arranged; the stability of the structures of the two after contact is ensured.

The treatment stent 2 can be a covered stent, and a drug coating for treating corresponding pathological changes is coated on the film of the covered stent.

Example 2

On the basis of example 1, in order to increase the stability of the skeleton support 1 after setting, the following settings were carried out: the two ends of the framework bracket 1 are integrally provided with an anchoring bracket 12 which has a larger opening size than the main body 11 of the framework bracket 1, and the framework bearing capacity of the anchoring bracket 12 part is larger than that of the framework bracket 1.

Example 3

On the basis of embodiment 1 or 2, the displacement prevention structure is set differently, and the specific setting mode may be any one of the following:

1. the outer side of the bracket wall of the treatment bracket 2 is provided with regular small protrusions, and the inner side of the bracket wall of the framework bracket 1 is provided with small recesses for accommodating the small protrusions. The arrangement can realize the position fixation of the treatment bracket 2 in the framework bracket 1. All the mesh edges of the framework bracket 1 are provided with small recesses, the longitudinal distance between every two adjacent small recesses is the same, 2-4 rows of small protrusions are arranged on the treatment bracket 2, each row of small protrusions are arranged along the same row of meshes, and the distance between every two small recesses is equal to the distance between every two small protrusions after all the structures are unfolded. This arrangement maximizes the contact of the tabs with the dimples. The height of the small protrusions is smaller than the thickness of the framework support 1, and the arrangement can ensure that the injury to the blood vessel wall can be avoided on the premise of fixing the position.

2. The anti-moving structure is a biological material layer which is arranged on the inner side of the wall of the framework bracket 1 or on the outer side of the wall of the treatment bracket 2 and increases the friction force, and the arrangement can also improve the contact stability between the relevant parts.

3. The treatment stent 2 includes anchoring portions 21 on both sides larger than the main body 11 of the treatment stent 2; the mesh of the anchoring portion 21 is equal to the mesh size of the skeletal stent 1, and the edge of the anchoring portion 21 protrudes through the mesh of the skeletal stent 1 onto the vessel wall; the arrangement has the anchoring effect in the framework bracket 1, and the stability of the whole structure and the position is ensured.

Example 4 combination vascular stents for the treatment of cardiovascular pathologies

A combined blood vessel stent for treating cardiovascular diseases comprises a skeleton stent 1 on the outer layer and a treatment stent 2 on the inner layer; the framework bracket 1 is a bracket with large meshes and without influencing blood flow, and the treatment bracket 2 is a bracket which is arranged in the framework bracket 1, is expanded for a positioning position and is fixed at a specific position of the framework bracket 1; the treatment bracket 2 is provided with a displacement prevention structure which ensures that the position of the inner bracket does not move after being unfolded; the framework support 1 is arranged into one support, and the inner layer support is arranged into one or more same or different supports. An appropriate skeletal stent 1 is selected for cardiovascular conditions, and one or more identical or different therapeutic stents 2 are selected preoperatively or intraoperatively according to the pathological condition of the blood vessel. The framework support 1 with different pipe diameters after being expanded is arranged, the treatment support 2 is arranged in a matched mode, the framework support 1 with the proper pipe diameter is selected according to the circumference condition of the blood vessel at the cardiovascular pathological change position, and the treatment support 2 with the specific size is selected correspondingly.

The mesh shape of the framework bracket 1 is set in the following manner: the meshes of the framework bracket 1 are circular meshes, and the diameter of the meshes is larger than 1/5 of the diameter of the implanted blood vessel;

the other setting mode is as follows: the meshes of the framework stent 1 are quadrilateral meshes, and the length of the short diagonal line of the quadrilateral meshes is larger than 1/5 of the caliber of the blood vessel.

The meshes of the therapeutic stent 2 are parallelogram meshes, wherein rhombic meshes are preferred; the vertexes of any two adjacent rhombuses are connected. Alternatively, the therapeutic stent 2 is a mesh formed by sine wave cross-linking. The treatment stent 2 can be a covered stent, and a drug coating for treating corresponding pathological changes is coated on the film of the covered stent.

1/3 or 1/4 that is set for the mesh area of the treatment stent 2 equal to the mesh area of the skeleton stent 1 during the cardiovascular part operation; this arrangement ensures both respective functions.

The whole skeleton support 1 is the non-tectorial membrane support, and main part 11 is even non-tectorial membrane support, and its core plays the supporting role, and can effectually prevent that the blood flow is not smooth.

The treatment stent 2 is a covered stent or a non-covered stent, and different treatment stents 2 are selected according to the requirements of treatment positions.

When the cardiovascular pathology is in the vicinity of a branch vessel; the stent graft 1 of this embodiment is a long stent graft, and the treatment stent graft 2 is a treatment stent graft 2 which is arranged in the stent graft 1 and does not cover the branch blood vessel in the vicinity of the branch blood vessel.

In this embodiment, when there are adjacent identical lesion sites within a cardiovascular lesion vessel, a plurality of identical therapeutic stents 2 are disposed within a single skeletal stent 1.

In this embodiment, a plurality of different therapeutic stents 2 are disposed within a single skeletal stent 1 when adjacent, different lesion sites are present within a cardiovascular lesion vessel.

The outer side of the bracket wall of the treatment bracket 2 is provided with regular small protrusions, and the inner side of the bracket wall of the framework bracket 1 is provided with small recesses for accommodating the small protrusions. The arrangement can realize the position fixation of the treatment bracket 2 in the framework bracket 1. The displacement prevention structure is as follows: all the mesh edges of the framework bracket 1 are provided with small recesses, the longitudinal distance between every two adjacent small recesses is the same, 2-4 rows of small protrusions are arranged on the treatment bracket 2, each row of small protrusions are arranged along the same row of meshes, and the distance between every two small recesses is equal to the distance between every two small protrusions after all the structures are unfolded. This arrangement maximizes the contact of the tabs with the dimples. The height of the small protrusions is smaller than the thickness of the framework support 1, and the arrangement can ensure that the injury to the blood vessel wall can be avoided on the premise of fixing the position.

Example 5

On the basis of example 4, in order to increase the stability of the skeleton support 1 after setting, the following settings were carried out: the two ends of the framework bracket 1 are integrally provided with an anchoring bracket 12 which has a larger opening size than the main body 11 of the framework bracket 1, and the framework bearing capacity of the anchoring bracket 12 part is larger than that of the framework bracket 1.

Example 6

On the basis of embodiment 4 or 5, the displacement prevention structure is set differently, and the specific setting mode may be any one of the following:

1. the outer side of the bracket wall of the treatment bracket 2 is provided with regular small protrusions, and the inner side of the bracket wall of the framework bracket 1 is provided with small recesses for accommodating the small protrusions. The arrangement can realize the position fixation of the treatment bracket 2 in the framework bracket 1. All the mesh edges of the framework bracket 1 are provided with small recesses, the longitudinal distance between every two adjacent small recesses is the same, 2-4 rows of small protrusions are arranged on the treatment bracket 2, each row of small protrusions are arranged along the same row of meshes, and the distance between every two small recesses is equal to the distance between every two small protrusions after all the structures are unfolded. This arrangement maximizes the contact of the tabs with the dimples. The height of the small protrusions is smaller than the thickness of the framework support 1, and the arrangement can ensure that the injury to the blood vessel wall can be avoided on the premise of fixing the position.

2. The anti-moving structure is a biological material layer which is arranged on the inner side of the wall of the framework bracket 1 or on the outer side of the wall of the treatment bracket 2 and increases the friction force, and the arrangement can also improve the contact stability between the relevant parts.

3. The treatment stent 2 includes anchoring portions 21 on both sides larger than the main body 11 of the treatment stent 2; the mesh of the anchoring portion 21 is equal to the mesh size of the skeletal stent 1, and the edge of the anchoring portion 21 protrudes through the mesh of the skeletal stent 1 onto the vessel wall; the arrangement has the anchoring effect in the framework bracket 1, and the stability of the whole structure and the position is ensured.

EXAMPLE 7 Combined vascular Stent for treatment of vascular dissection

A combined blood vessel stent for treating vascular dissections comprises a skeleton stent 1 on the outer layer and a treatment stent 2 on the inner layer; the framework bracket 1 is a bracket with large meshes and without influencing blood flow, and the treatment bracket 2 is a bracket which is arranged in the framework bracket 1, is expanded for a positioning position and is fixed at a specific position of the framework bracket 1; the treatment bracket 2 is provided with a displacement prevention structure which ensures that the position of the inner bracket does not move after being unfolded; the framework bracket 1 is arranged into one bracket, and the inner layer bracket is arranged into a plurality of same brackets; the treatment stent 2 is a non-covered stent. An appropriate framework stent 1 and a corresponding number of therapeutic stents 2 are selected for the case of a vessel dissection. The mesh shape of the framework bracket 1 is set in the following manner: the meshes of the framework bracket 1 are circular meshes, and the diameter of the meshes is larger than 1/5 of the diameter of the implanted blood vessel;

the other setting mode is as follows: the meshes of the framework stent 1 are quadrilateral meshes, and the length of the short diagonal line of the quadrilateral meshes is larger than 1/5 of the caliber of the blood vessel.

The meshes of the therapeutic stent 2 are parallelogram meshes, wherein rhombic meshes are preferred; the vertexes of any two adjacent rhombuses are connected. Alternatively, the therapeutic stent 2 is a mesh formed by sine wave cross-linking.

1/3 where the mesh area of the therapeutic stent 2 is not greater than the mesh area of the skeletal stent 1; the framework stent 1 is a non-covered stent, the main body 11 is an even non-covered stent, and the core of the non-covered stent plays a role in supporting and can effectively prevent unsmooth blood flow.

The displacement prevention structure is a protruding structure 3 arranged on the inner side of the framework bracket 1, and the protruding structure 3 is contacted with the bracket wall of the treatment bracket 2 to effectively prevent mutual sliding; or the displacement prevention structure is a protruding structure 3 arranged on the outer side of the support wall of the treatment support 2, and the protruding structure 3 is tightly contacted with the support wall of the skeleton support 1; the placing displacement can be effectively realized through the protruding structures 3 arranged on the support wall for contact. The inner side of the wall of the framework support 1 or the outer side of the wall of the treatment support 2 is provided with the protruding structures 3, a plurality of rows of the protruding structures 3 are longitudinally arranged along the support, the longitudinal distance between every two adjacent protruding structures 3 is equal, each row of the protruding structures 3 are arranged along the meshes of the same longitudinal row and are arranged on the corresponding mesh edges, the arrangement can ensure that the protruding structures 3 contact the inner side of the wall of the treatment support 2 or the outer side of the framework support 1 to the maximum extent, and the stability of entering the rear structure is ensured. The protruding structures 3 arranged on the inner side of the wall of the framework bracket 1 are uniformly arranged along the side edge of the mesh; the projecting structures 3 arranged on the therapeutic support 2 are arranged on the upper and lower edges of the meshes. This arrangement ensures the effectiveness of the arrangement of the projection arrangements 3. 2-6 columns of the protruding structures 3 are arranged; the stability of the structures of the two after contact is ensured.

Example 8

On the basis of embodiment 7, the displacement prevention structure is set differently, and the specific setting mode may be any one of the following:

1. the outer side of the bracket wall of the treatment bracket 2 is provided with regular small protrusions, and the inner side of the bracket wall of the framework bracket 1 is provided with small recesses for accommodating the small protrusions. The arrangement can realize the position fixation of the treatment bracket 2 in the framework bracket 1. All the mesh edges of the framework bracket 1 are provided with small recesses, the longitudinal distance between every two adjacent small recesses is the same, 2-4 rows of small protrusions are arranged on the treatment bracket 2, each row of small protrusions are arranged along the same row of meshes, and the distance between every two small recesses is equal to the distance between every two small protrusions after all the structures are unfolded. This arrangement maximizes the contact of the tabs with the dimples. The height of the small protrusions is smaller than the thickness of the framework support 1, and the arrangement can ensure that the injury to the blood vessel wall can be avoided on the premise of fixing the position.

2. The anti-moving structure is a biological material layer which is arranged on the inner side of the wall of the framework bracket 1 or on the outer side of the wall of the treatment bracket 2 and increases the friction force, and the arrangement can also improve the contact stability between the relevant parts.

3. The treatment stent 2 includes anchoring portions 21 on both sides larger than the main body 11 of the treatment stent 2; the mesh of the anchoring portion 21 is equal to the mesh size of the skeletal stent 1, and the edge of the anchoring portion 21 protrudes through the mesh of the skeletal stent 1 onto the vessel wall; the arrangement has the anchoring effect in the framework bracket 1, and the stability of the whole structure and the position is ensured.

The above description of the embodiments is only for the understanding of the present invention. It should be noted that modifications could be made to the invention without departing from the principle of the invention, which would also fall within the scope of the claims of the invention.