A vascular stent capable of being combined and used

Abstract

A vascular stent that can be used in combination and sleeve, comprising an outer skeleton stent and an inner treatment stent; characterized in that the skeleton stent is a stent with large meshes that does not affect blood flow, and the treatment stent is a stent arranged in the skeleton stent, and fixed at a specific position of the skeleton stent after being opened to find the correct position; an anti-displacement structure is arranged on the treatment stent to ensure that the inner stent does not move after being opened; the skeleton stent is arranged as one, and the inner stent is arranged as one or more identical or different stents. Suitable skeleton stents are selected for different blood vessel locations, and one or more identical or different treatment stents are selected before or during surgery according to the pathological conditions of the blood vessels.

Description

Technical Field

[0001] The invention belongs to the technical field of vascular stent devices, and in particular relates to a vascular stent that can be used in combination and sleeve connection. Background Art

[0002] In current surgical procedures, there are often multiple lesions in a blood vessel or lesion tissues near branches. If a longer vascular stent is inserted, the blood flow will be affected due to the dense mesh of the vascular stent. If a shorter stent is selected, the stent may easily move away from the lesion site. Directly using a stent with a larger mesh will not have a significant supporting effect on the lesion site, and the lesion tissue may easily overflow through the large mesh, failing to achieve the purpose of expanding the lesion site. In addition, when it comes to medication and covered stents, the medication effect of the stent with a larger mesh is also very poor, and the stability of the coating is also very poor.

[0003] At present, there are sometimes different lesion locations in a blood vessel, and different lesion locations often require different treatment methods. A single vascular stent is difficult to meet the treatment of lesion locations with different treatment and treatment plans. For example, there is a stent that needs to be placed in the adjacent position of a blood vessel to treat vascular stenosis, and another position is a stent that needs to be placed in the adjacent position for aneurysm treatment. The structures, coating conditions, and drug conditions of these two stents are different, and different stents need to be placed in batches, but this method is difficult and time-consuming.

[0004] In addition, the treatment of vascular dissection requires the insertion of multiple stents in an overlapping manner, which can easily cause damage to the blood vessels at the junction of the stents. In addition, the insertion of multiple stents in an overlapping manner is difficult, making clinical implementation difficult and requiring high technical skills from doctors.

[0005] The present invention aims at a series of stent problems in the prior art, such as the presence of lesions on both sides of branch vessels in a blood vessel, making it difficult to implant a stent; the presence of multiple lesions in a blood vessel, sometimes multiple different lesions, making it difficult to complete the treatment with one stent; and the difficulty in implanting a stent in a vascular dissection. The present invention provides a vascular stent that can be used in combination and can solve the above technical problems. Summary of the invention

[0006] A vascular stent that can be used in combination and sleeve, comprising an outer skeleton stent and an inner treatment stent; characterized in that the skeleton stent is a stent with large meshes that does not affect blood flow, and the treatment stent is a stent arranged in the skeleton stent, and fixed at a specific position of the skeleton stent after being opened to find the correct position; an anti-displacement structure is arranged on the treatment stent to ensure that the inner stent does not move after being opened; the skeleton stent is arranged as one, and the inner stent is arranged as one or more identical or different stents. Suitable skeleton stents are selected for different blood vessel locations, and one or more identical or different treatment stents are selected before or during surgery according to the pathological conditions of the blood vessels.

[0007] Furthermore, the mesh of the skeleton stent is a circular mesh, and the diameter of the mesh is greater than 1 / 5 of the diameter of the implanted blood vessel; or the mesh of the skeleton stent is a quadrilateral mesh, and the length of the short diagonal of the quadrilateral mesh is greater than 1 / 5 of the diameter of the blood vessel.

[0008] Furthermore, the mesh area of ​​the treatment support is no greater than 1 / 3 of the mesh area of ​​the skeleton support; this arrangement ensures the respective functions of the two.

[0009] Furthermore, the skeleton stent is a non-covered stent, the core of which is to play a supporting role and can effectively prevent poor blood flow.

[0010] Furthermore, the main body of the skeleton stent is a uniform non-coated stent.

[0011] Furthermore, anchor brackets with a larger expansion size than the main body of the skeleton bracket are integrally arranged at both ends of the skeleton bracket, and the skeleton pressure bearing capacity of the anchor bracket part is greater than that of the skeleton bracket. This arrangement can effectively ensure the stability of the position of the skeleton bracket after insertion and the stability of the structure after expansion.

[0012] Furthermore, the treatment stent is a coated stent or a non-coated stent, and different treatment stents are selected according to the needs of the treatment position.

[0013] Furthermore, when the diseased blood vessel is near a branch blood vessel, the skeleton stent is a long stent, and the treatment stent is a treatment stent that is arranged in the skeleton stent and near the branch blood vessel but does not cover the branch blood vessel.

[0014] Alternatively, when there are multiple adjacent identical lesion locations in a diseased blood vessel, multiple identical treatment stents are arranged in one skeleton stent.

[0015] Alternatively, when there are multiple adjacent different lesion locations in a diseased blood vessel, multiple different treatment stents are arranged in one skeleton stent.

[0016] Furthermore, the anti-displacement structure is a protruding structure arranged on the inner side of the skeleton support, and the protruding structure contacts the support wall of the treatment support to effectively prevent mutual sliding; or, the anti-displacement 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 skeleton support; by setting the protruding structure in contact with the support wall, placement displacement can be effectively achieved.

[0017] Furthermore, a protruding structure is arranged on the inner side of the skeleton support wall or the outer side of the treatment support wall, and multiple rows of protruding structures are arranged along the longitudinal direction of the support, the longitudinal distance between every two adjacent protruding structures is equal, and each row of protruding structures is arranged along the mesh of the same longitudinal row and on the corresponding mesh edge. This arrangement can ensure that the protruding structure contacts the inner wall of the treatment support or the outer wall of the skeleton support to the greatest extent, thereby ensuring the stability of the structure after entering.

[0018] Furthermore, the protruding structures arranged on the inner side of the frame support wall are evenly arranged along the side edges of the mesh, and the protruding structures arranged on the treatment support are arranged on the upper and lower edges of the mesh. This arrangement can ensure the effectiveness of the protruding structure arrangement.

[0019] Furthermore, 2-6 columns of protruding structures are provided to ensure the stability of the two structures after contact.

[0020] Alternatively, regular small protrusions are arranged on the outer side of the support wall of the treatment support, and small depressions for accommodating the small protrusions are arranged on the inner side of the support wall of the framework support. This arrangement can achieve the position fixation of the treatment support in the framework support.

[0021] Furthermore, small depressions are arranged on the mesh edges of all skeleton stents, the longitudinal distances between adjacent small depressions are the same, 2-4 rows of small protrusions are arranged on the treatment stent, each row of small protrusions is arranged along the same row of meshes, and after all structures are stretched, the distance between every two small depressions is equal to the distance between every two small protrusions. In this arrangement, the small protrusions can contact the small depressions to the greatest extent.

[0022] Furthermore, the height of the small protrusion is smaller than the thickness of the skeleton support. This arrangement can ensure that the position is fixed without causing damage to the blood vessel wall.

[0023] Alternatively, the anti-movement structure is a biomaterial layer that is arranged on the inner side of the skeleton stent wall or the outer side of the treatment stent wall to increase the friction force. This arrangement can also improve the contact stability between the related parts.

[0024] Alternatively, the treatment stent includes anchoring parts on both sides that are larger than the treatment stent main body; the mesh size of the anchoring parts is equal to the mesh size of the skeleton stent, and the edge of the anchoring part extends into the blood vessel wall through the mesh of the skeleton stent; this arrangement has an anchoring effect within the skeleton stent, ensuring the stability of the overall structure and position.

[0025] Furthermore, the skeleton stent is a stent set beside any branch blood vessel where diseased tissue exists, in multiple lesion locations, and in a blood vessel with vascular dissection lesions, wherein preferably the skeleton stent is a stent set in a cerebral blood vessel, or the skeleton stent is a stent set in a diseased blood vessel with vascular dissection.

[0026] Furthermore, the therapeutic stent is a coated stent, the membrane of which is coated with a drug coating for treating corresponding lesions.

[0027] Furthermore, the mesh of the treatment support is a parallelogram mesh, wherein a rhombus mesh is preferred; the vertices of any two adjacent rhombuses are connected.

[0028] Alternatively, the therapeutic stent is a mesh formed by interlaced connection of sinusoidal waves.

[0029] Furthermore, a skeleton stent having different tube diameters after expansion is provided, and a treatment stent is provided in combination, and a skeleton stent of a suitable tube diameter is selected according to the circumference of the blood vessel at the lesion location, and a treatment stent of a specific size is selected accordingly.

[0030] Compared with the stents in the prior art, the present concept uses an effective external skeleton stent and an internal therapeutic stent, which can be effectively and quickly placed when the lesion is near a branch, when there are multiple identical or different lesions adjacent to each other, or when there is a vascular dissection lesion, and achieves a good therapeutic effect, effectively avoiding the problem of repeated placement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention with three treatment stents;

[0032] Figure 2 It is a partial enlarged structural schematic diagram of the skeleton support and the treatment support of the present invention;

[0033] Figure 3 This is a schematic diagram of the overall structure of the treatment stent of the present invention which is a bare stent;

[0034] Figure 4 This is a schematic diagram of the overall structure of the skeleton support of the present invention;

[0035] Figure 5 It is a schematic diagram of a partially enlarged structure of the protruding structure on the inner side of the skeleton support wall of the present invention;

[0036] Figure 6 It is a schematic diagram of a partially enlarged structure of the protruding structure on the outer side of the treatment stent wall of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the therapeutic stent of the present invention, which is coated and has an anchoring portion;

[0038] In the figure, 1. skeleton support; 11. main body; 12. anchoring support; 2. treatment support; 21. anchoring part; 3. protruding structure. DETAILED DESCRIPTION

[0039] Example 1 A combined vascular stent for treating cerebral vascular lesions

[0040] A combined vascular stent for treating cerebral vascular lesions, comprising an outer skeleton stent 1 and an inner treatment stent 2; the skeleton stent 1 is a stent with large meshes that does not affect blood flow, and the treatment stent 2 is a stent arranged inside the skeleton stent 1, and fixed at a specific position of the skeleton stent 1 after being expanded to find the correct position; an anti-displacement structure is arranged on the treatment stent 2 to ensure that the inner stent does not move after being expanded; the skeleton stent 1 is arranged as one, and the inner stent is arranged as one or more identical or different stents. Select a suitable skeleton stent 1 according to the condition of the cerebral blood vessels, and select one or more identical or different treatment stents 2 according to the condition of the blood vessels before or during surgery. Set a skeleton stent 1 with different diameters after expansion, and match it with a treatment stent 2, select a skeleton stent 1 with a suitable diameter according to the circumference of the blood vessels at the location of the cerebral vascular lesions, and select a treatment stent 2 of a specific size accordingly.

[0041] The mesh shape of the skeleton stent 1 is set as follows: the mesh of the skeleton stent 1 is a circular mesh, and the diameter of the mesh is greater than 1 / 5 of the diameter of the implanted blood vessel;

[0042] Another configuration is that the mesh of the skeleton support 1 is a quadrilateral mesh, and the length of the short diagonal line of the quadrilateral mesh is greater than 1 / 5 of the diameter of the blood vessel.

[0043] The mesh of the treatment support 2 is a parallelogram mesh, preferably a rhombus mesh, wherein the vertices of any two adjacent rhombuses are connected. Alternatively, the treatment support 2 is a mesh formed by sinusoidal interlacing.

[0044] During surgery on brain blood vessels, the mesh area of ​​the treatment stent 2 is equal to 1 / 3 of the mesh area of ​​the skeleton stent 1. This arrangement ensures the respective functions of the two.

[0045] The skeleton stent 1 is a non-coated stent as a whole, and the main body 11 is a uniform non-coated stent, the core of which plays a supporting role and can effectively prevent poor blood flow.

[0046] The treatment stent 2 is a coated stent or a non-coated stent, and different treatment stents 2 are selected according to the needs of the treatment position.

[0047] When the cerebral vascular lesions are near the branch vessels; the skeleton stent 1 of this embodiment is a long stent, and the treatment stent 2 is a treatment stent 2 that is arranged in the skeleton stent 1 and near the branch vessels without covering the branch vessels.

[0048] When there are multiple adjacent identical lesion locations in a cerebral vascular diseased blood vessel, in this embodiment, multiple identical treatment stents 2 are arranged in one skeleton stent 1.

[0049] When there are multiple adjacent different lesion locations in a cerebral vascular diseased blood vessel, in this embodiment, multiple different treatment stents 2 are arranged in one skeleton stent 1.

[0050] The anti-displacement structure is a protruding structure 3 arranged on the inner side of the skeleton support 1, and the protruding structure 3 contacts the support wall of the treatment support 2 to effectively prevent mutual sliding; or, the anti-displacement 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 contacts the support wall of the skeleton support 1 closely; by setting the protruding structure 3 in contact with the support wall, the placement displacement can be effectively achieved. The protruding structure 3 is arranged on the inner side of the wall of the skeleton support 1 or the outer side of the wall of the treatment support 2, and multiple rows of protruding structures 3 are arranged along the longitudinal direction of the support, and the longitudinal distance between every two adjacent protruding structures 3 is equal. Each row of protruding structures 3 is arranged along the mesh of the same longitudinal row and is arranged on the corresponding mesh edge. This arrangement can ensure that the protruding structure 3 contacts the inner wall of the treatment support 2 or the outer wall of the skeleton support 1 to the greatest extent, and ensure the stability of the structure after entering. The protruding structure 3 arranged on the inner side of the wall of the skeleton support 1 is evenly arranged along the side of the mesh; the protruding structure 3 arranged on the treatment support 2 is arranged on the upper and lower sides of the mesh. This arrangement can ensure the effectiveness of the setting of the protruding structure 3. 2-6 rows of protruding structures 3 are arranged; the stability of the two structures after contact is ensured.

[0051] The treatment stent 2 may be a coated stent, the membrane of which is coated with a drug coating for treating corresponding lesions.

[0052] Example 2

[0053] On the basis of Example 1, in order to increase the stability of the skeleton support 1 after installation, the following settings are made: anchoring brackets 12 with a larger expansion size than the main body 11 of the skeleton support 1 are integrally provided at both ends of the skeleton support 1, and the skeleton pressure bearing capacity of the anchoring bracket 12 part is greater than that of the skeleton support 1.

[0054] Example 3

[0055] On the basis of Embodiment 1 or 2, the anti-displacement structure is configured differently, and the specific configuration may be any of the following:

[0056] 1. Regular small protrusions are arranged on the outer side of the stent wall of the treatment stent 2, and small depressions for accommodating the small protrusions are arranged on the inner side of the stent wall of the skeleton stent 1. This arrangement can achieve the fixed position of the treatment stent 2 in the skeleton stent 1. Small depressions are arranged on the edges of all meshes of the skeleton stent 1, and the longitudinal distances between adjacent small depressions are the same. 2-4 columns of small protrusions are arranged on the treatment stent 2, and each column of small protrusions is arranged along the same column of meshes. After all structures are stretched out, the distance between every two small depressions is equal to the distance between every two small protrusions. This arrangement allows the small protrusions to contact the small depressions to the greatest extent. The height of the small protrusions is less than the thickness of the skeleton stent 1. This arrangement can ensure that damage to the blood vessel wall is prevented under the premise of fixed position.

[0057] 2. The anti-movement structure is a biomaterial layer that is arranged on the inner side of the wall of the skeleton support 1 or the outer side of the wall of the treatment support 2 to increase the friction. This arrangement can also improve the contact stability between the related parts.

[0058] 3. The treatment stent 2 includes anchoring parts 21 on both sides that are larger than the main body 11 of the treatment stent 2; the mesh size of the anchoring part 21 is equal to the mesh size of the skeleton stent 1, and the edge of the anchoring part 21 extends into the blood vessel wall through the mesh of the skeleton stent 1; this arrangement has an anchoring effect within the skeleton stent 1, ensuring the stability of the overall structure and position.

[0059] Example 4 Combined vascular stent for treating cardiovascular disease

[0060] A combined vascular stent for treating cardiovascular diseases, comprising an outer skeleton stent 1 and an inner therapeutic stent 2; the skeleton stent 1 is a stent with large meshes that does not affect blood flow, and the therapeutic stent 2 is a stent arranged inside the skeleton stent 1, and fixed at a specific position of the skeleton stent 1 after being expanded to find the correct position; an anti-displacement structure is arranged on the therapeutic stent 2 to ensure that the inner stent does not move after being expanded; the skeleton stent 1 is arranged as one, and the inner stent is arranged as one or more identical or different stents. Select a suitable skeleton stent 1 according to the cardiovascular condition, and select one or more identical or different therapeutic stents 2 according to the vascular lesion condition before or during surgery. Set a skeleton stent 1 with different diameters after expansion, and match it with a therapeutic stent 2, select a skeleton stent 1 with a suitable diameter according to the circumference of the blood vessel at the location of the cardiovascular lesion, and select a therapeutic stent 2 of a specific size accordingly.

[0061] The mesh shape of the skeleton stent 1 is set as follows: the mesh of the skeleton stent 1 is a circular mesh, and the diameter of the mesh is greater than 1 / 5 of the diameter of the implanted blood vessel;

[0062] Another configuration is that the mesh of the skeleton support 1 is a quadrilateral mesh, and the length of the short diagonal line of the quadrilateral mesh is greater than 1 / 5 of the diameter of the blood vessel.

[0063] The mesh of the treatment stent 2 is a parallelogram mesh, preferably a rhombus mesh; the vertices of any two adjacent rhombuses are connected. Alternatively, the treatment stent 2 is a mesh formed by sinusoidal interlacing. The treatment stent 2 can be a coated stent, and the film thereof is coated with a drug coating for treating the corresponding lesion.

[0064] During cardiovascular surgery, the mesh area of ​​the treatment stent 2 is set to be equal to 1 / 3 or 1 / 4 of the mesh area of ​​the skeleton stent 1; this setting ensures the respective functions of the two.

[0065] The skeleton stent 1 is a non-coated stent as a whole, and the main body 11 is a uniform non-coated stent, the core of which plays a supporting role and can effectively prevent poor blood flow.

[0066] The treatment stent 2 is a coated stent or a non-coated stent, and different treatment stents 2 are selected according to the needs of the treatment position.

[0067] When the cardiovascular lesion is near a branch vessel, the skeleton stent 1 in this embodiment is a long stent, and the treatment stent 2 is a treatment stent 2 that is arranged inside the skeleton stent 1 and near the branch vessel but does not cover the branch vessel.

[0068] When there are multiple adjacent identical lesion locations in a cardiovascular diseased blood vessel, in this embodiment, multiple identical treatment stents 2 are arranged in one skeleton stent 1.

[0069] When there are multiple adjacent different lesion locations in a cardiovascular diseased blood vessel, in this embodiment, multiple different treatment stents 2 are arranged in one skeleton stent 1.

[0070] Regular small protrusions are arranged on the outer side of the stent wall of the treatment stent 2, and small depressions for accommodating the small protrusions are arranged on the inner side of the stent wall of the skeleton stent 1. This arrangement can achieve fixed position of the treatment stent 2 in the skeleton stent 1. The anti-displacement structure is as follows: small depressions are arranged on the edges of all meshes of the skeleton stent 1, the longitudinal distances between adjacent small depressions are the same, 2-4 columns of small protrusions are arranged on the treatment stent 2, and each column of small protrusions is arranged along the same column of meshes. After all structures are stretched out, the distance between every two small depressions is equal to the distance between every two small protrusions. This arrangement allows the small protrusions to contact the small depressions to the greatest extent. The height of the small protrusions is less than the thickness of the skeleton stent 1. This arrangement can ensure that damage to the blood vessel wall is prevented under the premise of fixed position.

[0071] Example 5

[0072] On the basis of Example 4, in order to increase the stability of the skeleton support 1 after installation, the following settings are made: anchoring brackets 12 with a larger expansion size than the main body 11 of the skeleton support 1 are integrally provided at both ends of the skeleton support 1, and the skeleton pressure bearing capacity of the anchoring bracket 12 part is greater than that of the skeleton support 1.

[0073] Example 6

[0074] On the basis of Embodiment 4 or 5, the anti-displacement structure is configured differently, and the specific configuration may be any of the following:

[0075] 1. Regular small protrusions are arranged on the outer side of the stent wall of the treatment stent 2, and small depressions for accommodating the small protrusions are arranged on the inner side of the stent wall of the skeleton stent 1. This arrangement can achieve the fixed position of the treatment stent 2 in the skeleton stent 1. Small depressions are arranged on the edges of all meshes of the skeleton stent 1, and the longitudinal distances between adjacent small depressions are the same. 2-4 columns of small protrusions are arranged on the treatment stent 2, and each column of small protrusions is arranged along the same column of meshes. After all structures are stretched out, the distance between every two small depressions is equal to the distance between every two small protrusions. This arrangement allows the small protrusions to contact the small depressions to the greatest extent. The height of the small protrusions is less than the thickness of the skeleton stent 1. This arrangement can ensure that damage to the blood vessel wall is prevented under the premise of fixed position.

[0076] 2. The anti-movement structure is a biomaterial layer that is arranged on the inner side of the wall of the skeleton support 1 or the outer side of the wall of the treatment support 2 to increase the friction. This arrangement can also improve the contact stability between the related parts.

[0077] 3. The treatment stent 2 includes anchoring parts 21 on both sides that are larger than the main body 11 of the treatment stent 2; the mesh size of the anchoring part 21 is equal to the mesh size of the skeleton stent 1, and the edge of the anchoring part 21 extends into the blood vessel wall through the mesh of the skeleton stent 1; this arrangement has an anchoring effect within the skeleton stent 1, ensuring the stability of the overall structure and position.

[0078] Example 7 Combined vascular stent for treating vascular dissection

[0079] A combined vascular stent for treating vascular dissection, comprising an outer skeleton stent 1 and an inner therapeutic stent 2; the skeleton stent 1 is a stent with large meshes that does not affect blood flow, and the therapeutic stent 2 is arranged inside the skeleton stent 1, and is fixed at a specific position of the skeleton stent 1 after being expanded to find the correct position; an anti-displacement structure is arranged on the therapeutic stent 2 to ensure that the inner stent does not move after being expanded; the skeleton stent 1 is arranged as one, and the inner stent is arranged as a plurality of identical stents; the therapeutic stent 2 is a non-coated stent. According to the situation of vascular dissection, a suitable skeleton stent 1 and a corresponding number of therapeutic stents 2 are selected. The setting method for the mesh shape of the skeleton stent 1 is as follows: the mesh of the skeleton stent 1 is a circular mesh, and the diameter of the mesh is greater than 1 / 5 of the diameter of the implanted blood vessel;

[0080] Another configuration is that the mesh of the skeleton support 1 is a quadrilateral mesh, and the length of the short diagonal line of the quadrilateral mesh is greater than 1 / 5 of the diameter of the blood vessel.

[0081] The mesh of the treatment support 2 is a parallelogram mesh, preferably a rhombus mesh, wherein the vertices of any two adjacent rhombuses are connected. Alternatively, the treatment support 2 is a mesh formed by sinusoidal interlacing.

[0082] The mesh area of ​​the treatment stent 2 is not greater than 1 / 3 of the mesh area of ​​the skeleton stent 1; the skeleton stent 1 is a non-coated stent, and the main body 11 is a uniform non-coated stent, the core of which plays a supporting role and can effectively prevent poor blood flow.

[0083] The anti-displacement structure is a protruding structure 3 arranged on the inner side of the skeleton support 1, and the protruding structure 3 contacts the support wall of the treatment support 2 to effectively prevent mutual sliding; or, the anti-displacement 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 contacts the support wall of the skeleton support 1 closely; by setting the protruding structure 3 in contact with the support wall, the placement displacement can be effectively achieved. The protruding structure 3 is arranged on the inner side of the wall of the skeleton support 1 or the outer side of the wall of the treatment support 2, and multiple rows of protruding structures 3 are arranged along the longitudinal direction of the support, and the longitudinal distance between every two adjacent protruding structures 3 is equal. Each row of protruding structures 3 is arranged along the mesh of the same longitudinal row and is arranged on the corresponding mesh edge. This arrangement can ensure that the protruding structure 3 contacts the inner wall of the treatment support 2 or the outer wall of the skeleton support 1 to the greatest extent, and ensure the stability of the structure after entering. The protruding structure 3 arranged on the inner side of the wall of the skeleton support 1 is evenly arranged along the side of the mesh; the protruding structure 3 arranged on the treatment support 2 is arranged on the upper and lower sides of the mesh. This arrangement can ensure the effectiveness of the setting of the protruding structure 3. 2-6 rows of protruding structures 3 are arranged; the stability of the two structures after contact is ensured.

[0084] Example 8

[0085] Based on Example 7, the anti-displacement structure is configured differently, and the specific configuration may be any of the following:

[0086] 1. Regular small protrusions are arranged on the outer side of the stent wall of the treatment stent 2, and small depressions for accommodating the small protrusions are arranged on the inner side of the stent wall of the skeleton stent 1. This arrangement can achieve the fixed position of the treatment stent 2 in the skeleton stent 1. Small depressions are arranged on the edges of all meshes of the skeleton stent 1, and the longitudinal distances between adjacent small depressions are the same. 2-4 columns of small protrusions are arranged on the treatment stent 2, and each column of small protrusions is arranged along the same column of meshes. After all structures are stretched out, the distance between every two small depressions is equal to the distance between every two small protrusions. This arrangement allows the small protrusions to contact the small depressions to the greatest extent. The height of the small protrusions is less than the thickness of the skeleton stent 1. This arrangement can ensure that damage to the blood vessel wall is prevented under the premise of fixed position.

[0087] 2. The anti-movement structure is a biomaterial layer that is arranged on the inner side of the wall of the skeleton support 1 or the outer side of the wall of the treatment support 2 to increase the friction. This arrangement can also improve the contact stability between the related parts.

[0088] 3. The treatment stent 2 includes anchoring parts 21 on both sides that are larger than the main body 11 of the treatment stent 2; the mesh size of the anchoring part 21 is equal to the mesh size of the skeleton stent 1, and the edge of the anchoring part 21 extends into the blood vessel wall through the mesh of the skeleton stent 1; this arrangement has an anchoring effect within the skeleton stent 1, ensuring the stability of the overall structure and position.

[0089] The above embodiments are only used to understand the present invention. It should be noted that, for those skilled in the art, several improvements can be made to the present invention without departing from the principles of the present invention, and these improvements will also fall within the scope of protection of the claims of the present invention.

Claims

1. A vascular stent that can be used in combination, comprising an outer skeleton stent and an inner therapeutic stent; characterized in that: The skeleton stent is a stent with large meshes that does not affect blood flow, and the treatment stent is set inside the skeleton stent and fixed at a specific position of the skeleton stent after being expanded to find the correct position; the treatment stent is provided with an anti-displacement structure to ensure that the inner stent does not move after being expanded; the skeleton stent is provided as one, and the inner stent is provided as one or more identical or different stents; The anti-displacement structure is arranged as follows: regular small protrusions are arranged on the outer side of the support wall of the treatment support, and small depressions for accommodating the small protrusions are arranged on the inner side of the support wall of the skeleton support; Small depressions are arranged on the mesh edges of all skeleton stents, and the longitudinal distances between adjacent small depressions are the same. 2-4 rows of small protrusions are arranged on the treatment stent, and each row of small protrusions is arranged along the same row of meshes. After all structures are stretched, the distance between every two small depressions is equal to the distance between every two small protrusions. The height of the small protrusion is less than the thickness of the skeleton support.

2. The vascular stent that can be combined and sleeved for use according to claim 1, characterized in that: The mesh of the skeleton stent is a circular mesh, and the diameter of the mesh is greater than 1 / 5 of the diameter of the implanted blood vessel; or the mesh of the skeleton stent is a quadrilateral mesh, and the length of the short diagonal of the quadrilateral mesh is greater than 1 / 5 of the diameter of the blood vessel.

3. The vascular stent that can be combined and sleeved for use according to claim 2, characterized in that: The mesh area of ​​the treatment stent is less than 1 / 3 of the mesh area of ​​the skeleton stent.

4. The vascular stent that can be combined and sleeved for use according to claim 2, characterized in that: Anchor brackets with a larger expansion size than the main body of the skeleton bracket are integrally arranged at both ends of the skeleton bracket, and the skeleton pressure bearing capacity of the anchor bracket part is greater than that of the skeleton bracket.

5. The vascular stent that can be combined and sleeved for use according to claim 1, characterized in that: When the diseased blood vessel is near a branch blood vessel; the skeleton stent is a long stent, and the treatment stent is a treatment stent that is arranged in the skeleton stent and near the branch blood vessel but does not cover the branch blood vessel; when there are multiple adjacent identical lesion locations in a diseased blood vessel, multiple identical treatment stents are arranged in one skeleton stent.

6. The vascular stent that can be combined and sleeved for use according to claim 1, characterized in that: When there are multiple adjacent different lesion locations in a diseased blood vessel, multiple different treatment stents are arranged in one skeleton stent.

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