CN115530927B

CN115530927B - Thrombectomy support and conveying system

Info

Publication number: CN115530927B
Application number: CN202211536583.0A
Authority: CN
Inventors: 吕学良; 吕纬岩; 孙剑; 李彬彬; 左洋
Original assignee: Beijing Jiushi Shenkang Medical Technology Co ltd
Current assignee: Beijing Jiushi Shenkang Medical Technology Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-04-07
Anticipated expiration: 2042-12-02
Also published as: CN115530927A

Abstract

The invention relates to the technical field of medical instruments, in particular to a thrombus removal support and a conveying system, wherein the thrombus removal support comprises a support main body, the support main body comprises a first section, a second section and a third section which are sequentially connected in the length direction of the support main body, the first section, the second section and the third section respectively comprise a plurality of support grids which are connected with one another, each support grid comprises a first rod, a second rod and a third rod, one end of each first rod is connected with one end of each second rod and one end of each third rod, and the diameter of each first rod in the second section is larger than that of each first rod in the first section and the third section.

Description

Thrombectomy support and conveying system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a thrombus taking support and a conveying system.

Background

Cerebral apoplexy is caused by the fact that blood can not flow into the brain due to the fact that cerebral blood vessels are blocked and thrombus is formed on the inner walls of the cerebral blood vessels. In clinic, thrombus is generally taken out by using a thrombus taking stent so as to recanalize the occluded blood vessel, but the adherence of the thrombus taking stent in the related technology after release is insufficient, so that the inner wall of the blood vessel is easily damaged, and the risk of blood vessel rupture is increased.

Disclosure of Invention

The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, the embodiment of the invention provides the thrombus removal support, which can improve the adherence performance after the thrombus removal support is released.

The embodiment of the invention also provides a conveying system.

The thrombus removal support comprises a support main body, wherein the support main body comprises a first section, a second section and a third section which are sequentially connected in the length direction of the support main body, the first section, the second section and the third section respectively comprise a plurality of support grids which are connected with one another, each support grid comprises a first rod, a second rod and a third rod, one end of each first rod is connected with one end of each second rod and one end of each third rod, and the diameter of each first rod in the second section is larger than that of each first rod in the first section and the third section.

The thrombus removal support provided by the embodiment of the invention can improve the wall adhesion performance after the thrombus removal support is released.

In some embodiments, the stent lattice is divided into a plurality of rows, the plurality of rows of stent lattices are sequentially connected in the length direction of the stent body, and each row of stent lattices comprises a plurality of stent lattices which are sequentially connected in the circumferential direction of the stent body.

In some embodiments, the first section comprises a first connection section and a second connection section connected in series, the second connection section is connected to the second section, and the mesh size of the stent mesh of the second connection section is larger than that of the stent mesh of the first connection section.

In some embodiments, the first rod has a first connection portion thereon and a second connection portion thereon, the first connection portion being connected to the second rod, the second connection portion being connected to the third rod.

In some embodiments, the length of the second connecting section in the length direction of the stent body is L1, the length of the second section in the length direction of the stent body is L2, the length of the third section in the length direction of the stent body is L3, and L1: l2: l3=1, or, L1: l2: l3=1:2:1, or, L1: l2: l3= 1.

In some embodiments, the diameter of the first rod in the second connecting section is R1, the diameter of the first rod in the second section is R2, the diameter of the first rod in the third section is R3, and R1= R3= (0.4-0.95) R2.

In some embodiments, the second connecting segment has a diameter of R4, the second segment has a diameter of R5, the third segment has a diameter of R6, and R4: R5: R6= (0.6-0.9): 1 (1.1-1.5).

In some embodiments, two adjacent stent grids along the length direction of the stent main body have a spiral included angle alpha, and the angle alpha is more than or equal to 35 ℃ and less than or equal to 65 ℃.

In some embodiments, the thrombectomy support further comprises a developing wire wound around the support body and developing rings respectively disposed on the first and third segments.

The conveying system of the embodiment of the invention comprises: the thrombus taking support is any one of the thrombus taking supports; and one end of the conveying main body is connected with the embolectomy support.

The conveying system provided by the embodiment of the invention can improve the adherence performance of the thrombus extraction stent after release.

Drawings

FIG. 1 is a schematic structural view of a thrombectomy support according to an embodiment of the present invention.

Fig. 2 is a schematic view of a stent lattice according to an embodiment of the present invention.

Fig. 3 is a schematic view of a stent body according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of the adherence of a thrombus removal stent in the related art.

Fig. 5 is a schematic view of the anchorage of a thrombus removal stent according to an embodiment of the invention.

FIG. 6 is a schematic view of an thrombectomy stent and thrombus according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a conveying system according to an embodiment of the present invention.

FIG. 8 is a schematic view of a delivery body and an embolectomy stent of an embodiment of the invention.

Reference numerals:

the delivery system 100, the delivery body 110, the coating 1110, the thrombectomy stent 120, the thrombus 200, the vascular model 300,

a stent body 1, a first section 11, a first connecting section 111, a second connecting section 112, a second section 12, a third section 13, openings 131, stent meshes 14,

a first rod 141, a first connection 1411, a second connection 1412,

a second rod 142, a third rod 143, a developing wire 2, and a developing ring 3.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

The embolectomy stent 120 comprises a stent body 1, wherein the stent body 1 comprises a first section 11, a second section 12 and a third section 13 which are sequentially connected in the length direction (the up-down direction shown in fig. 1) of the stent body 1, the first section 11, the second section 12 and the third section 13 respectively comprise a plurality of stent grids 14 which are connected with one another, each stent grid 14 comprises a first rod 141, a second rod 142 and a third rod 143, one end of each first rod 141 is connected with one end of each second rod 142 and one end of each third rod 143, and the diameter of each first rod 141 in the second section 12 is larger than that of each first rod 141 in the first section 11 and the third section 13.

Specifically, as shown in fig. 1 to 4, the stent main body 1 is a tubular lattice structure, the first section 11, the second section 12 and the third section 13 are sequentially connected in the up-down direction to form the stent main body 1, the third section 13 is located above the first section 11, and the upper end of the third section 13 is an opening 131. The first rod 141, the second rod 142, and the third rod 143 all extend in the up-down direction, the upper end of the first rod 141 is connected to the lower ends of the second rod 142 and the third rod 143, respectively, and the upper end of the second rod 142 and the upper end of the third rod 143 are distant from each other in the circumferential direction of the stent body 1.

It should be noted that the first segment 11 is adjacent to the operator relative to the third segment 13, i.e., the first segment 11 is the proximal end of the stent body 1 and the third segment 13 is the distal end of the stent body 1. The division points of the first section 11, the second section 12 and the third section 13 in the up-down direction are between the adjacent stent grids 14, that is, the first rod 141 does not have a division point in the up-down direction, so that the structural stability of the stent body 1 is ensured.

In the embodiment of the invention, the diameter of the first rod 141 in the second section 12 is set to be larger than the diameter of the first rod 141 in the first section 11 and the third section 13, and the diameter of the first rod 141 in the first section 11 and the third section 13 is reduced, so that the bending force to be borne by the second section 12 of the stent main body 1 is reduced, when the stent main body 1 is released in a bent blood vessel, the bending resistance of the second section 12 is stronger than that of the first section 11 and the third section 13, that is, when the embolectomy stent 120 is released in the blood vessel, the stent main body 1 can conform to the tortuous blood vessel, the original shape of the lumen of the blood vessel is not changed, the traction of the stent main body 1 to the blood vessel is reduced, the risk of blood vessel rupture is reduced, and the adherence performance of the stent main body 1 is also improved.

In the embodiment of the present invention, the diameter of the first rod 141 is set to be larger than the diameters of the second rod 142 and the third rod 143, and the diameters of the second rod 142 and the third rod 143 are the same, so that compared with the arrangement in which the diameters of the rods in the thrombus removal stent 120 are the same in the related art, the stent main body 1 in the embodiment of the present invention can provide a stronger radial supporting force, can effectively capture different types of thrombus 200, reduces the risk that the thrombus 200 escapes into a distal small blood vessel, opens an occluded blood vessel more quickly, avoids multiple thrombus removal operations, and improves the thrombus removal efficiency of the thrombus removal stent 120.

In some embodiments, the stent lattice 14 is divided into a plurality of rows, the plurality of rows of stent lattices 14 are sequentially connected in the length direction of the stent body 1, and each row of stent lattices 14 comprises a plurality of stent lattices 14 sequentially connected in the circumferential direction of the stent body 1.

Specifically, as shown in fig. 1, in the stent lattices 14 adjacent in the left-right direction, the third rod 143 of the stent lattice 14 located on the left side is connected to the second rod 142 of the stent lattice 14 located on the right side, in the stent lattices 14 adjacent in the up-down direction, the upper end of the second rod 142 of the stent lattice 14 located on the lower side is connected to the first rod 141 of the stent lattice 14 located on the left upper side, and the upper end of the third rod 143 of the stent lattice 14 located on the lower side is connected to the first rod 141 of the stent lattice 14 located on the right upper side. The support grids 14 in the left-right direction are sequentially connected to form a row of support grids 14, and the support grids 14 in the plurality of rows are sequentially connected in the up-down direction to form the support main body 1.

For example, the number of the stent meshes 14 in the up-down direction is at least 4, and when the number of the stent meshes 14 in the up-down direction is 4, that is, the first section 11 includes two stent meshes 14 in the up-down direction, the second section 12 includes one stent mesh 14 in the up-down direction, and the third section 13 includes one stent mesh 14 in the up-down direction.

For example, the number of the stent meshes 14 in the left-right direction may be 3, 4, 5, and 6, when the number of the stent meshes 14 in the left-right direction is 3, the first section 11 includes three stent meshes 14 in the left-right direction, the second section 12 includes three stent meshes 14 in the left-right direction, the third section 13 includes three stent meshes 14 in the left-right direction, when the number of the stent meshes 14 in the left-right direction is 4, the first section 11 includes four stent meshes 14 in the left-right direction, the second section 12 includes four stent meshes 14 in the left-right direction, and the third section 13 includes four stent meshes 14 in the left-right direction.

It is understood that the number of the stent meshes 14 in the left-right direction and the up-down direction may be specifically adjusted according to the length of the stent body 1 and the application scene.

The stent grids 14 of the embodiment of the invention are divided into a plurality of rows, the stent grids 14 which are spirally raised among the plurality of rows of stent grids 14, namely the stent main body 1 is integrally provided with the spirally raised stent grids 14, so that thrombus 200 can be spirally wound better, and the thrombus removal efficiency of the thrombus removal stent 120 is improved.

In some embodiments, the first segment 11 comprises a first connecting segment 111 and a second connecting segment 112 connected in series, the second connecting segment 112 is connected to the second segment 12, and the mesh size of the stent lattice 14 of the second connecting segment 112 is larger than that of the stent lattice 14 of the first connecting segment 111.

Specifically, as shown in fig. 1 and 3, the upper end of the second connection section 112 is connected to the second section 12, the lower end of the second connection section 112 is connected to the upper end of the first connection section 111, the first connection section 111 and the second connection section 112 are connected in the up-down direction to form the first section 11, and the diameters of the first connection section 111 decrease from top to bottom.

In the embodiment of the invention, the mesh size of the first connecting section 111 is set to be smaller than that of the second connecting section 112, namely the mesh size of the first connecting section 111 is smaller, and the mesh size of the second connecting section 112 is larger, so that the force transmission is facilitated to reduce the difficulty of pushing the stent main body 1 to a target blood vessel, the thrombus taking stent 120 can enter a tortuous blood vessel more easily, and the compliance of the stent main body 1 is improved.

It should be noted that the mesh size of the second section 12 and the third section 13 are larger than the mesh size of the first connecting section 111.

In some embodiments, the first rod 141 has a first connection portion 1411 and a second connection portion 1412, the first connection portion 1411 is connected to the second rod 142, and the second connection portion 1412 is connected to the third rod 143.

Specifically, as shown in fig. 2, the first connection portion 1411 and the second connection portion 1412 are positioned above the first rod 141, and the first connection portion 1411 is positioned on the left side of the second connection portion 1412, that is, the upper end of the first connection portion 1411 is connected to the lower end of the second rod 142, the lower end of the first connection portion 1411 is connected to the upper end of the first rod 141, the upper end of the second connection portion 1412 is connected to the lower end of the third rod 143, and the lower end of the second connection portion 1412 is connected to the upper end of the first rod 141.

For example, the first rod 141 is integrally formed, that is, the first connection portion 1411 and the second connection portion 1412 are integrally formed, and the integrally formed arrangement improves the structural stability of the first rod 141.

In the embodiment of the present invention, the first connection portion 1411 and the second connection portion 1412 are disposed on the first rod 141, so that the connection between the first rod 141 and the second rod 142 and the connection between the first rod 143 and the third rod 143 are more stable, and the structural stability of the stent body 1 is further improved.

In some embodiments, the length of the second connecting section 112 in the length direction of the stent body 1 is L1, the length of the second section 12 in the length direction of the stent body 1 is L2, the length of the third section 13 in the length direction of the stent body 1 is L3, and L1: l2: l3=1, or, L1: l2: l3=1:2:1, or, L1: l2: l3= 1.

Specifically, as shown in fig. 3, the length of the second connection section 112 in the up-down direction is L1, the length of the second section 12 in the up-down direction is L2, and the distance of the third section 13 in the up-down direction is L3, the number of the first rods 141 in the second connection section 112, the second section 12, and the third section 13 is adjusted by adjusting the lengths of the second connection section 112, the second section 12, and the third section 13 in the up-down direction, and the diameter of the first rod 141 in the second section 12 is set to be larger than the diameter of the first rods 141 in the second connection section 112 and the third section 13, so as to improve the bending resistance of the second section 12, and further improve the adherence performance of the stent body 1.

In some embodiments, the diameter of the first rod 141 in the second connecting segment 112 is R1, the diameter of the first rod 141 in the second segment 12 is R2, the diameter of the first rod 141 in the third segment 13 is R3, and R1= R3= (0.4-0.95) R2.

Specifically, the diameter of the first rod 141 in the second section 12 is larger than that of the first rod 141 in the second connection section 112, and the diameter of the first rod 141 in the second connection section 112 is the same as that of the first rod 141 in the third section 13, and the stent lattice 14 of the second section 12 has stronger bending resistance, so that the stent body 1 can conform to a tortuous blood vessel after being released, and the adherence performance of the stent body 1 is improved.

When the first rods 141 in the stent lattice 14 are cylindrical, that is, the diameters of the plurality of first rods 141 in the second section 12 are all the same, and the diameters of the plurality of first rods 141 in the second connecting section 112 are all the same, and the diameters of the plurality of first rods 141 in the third section 13 are all the same, the diameter R2 of the first rod 141 in the second section 12 is the diameter of any first rod 141 in the second section 12, the diameter R1 of the first rod 141 in the second connecting section 112 is the diameter of any first rod 141 in the second connecting section 112, the diameter R3 of the first rod 141 in the third section 13 is the diameter of any first rod 141 in the third section 13, and R1= R3= (0.4-0.95) R2.

When the first rods 141 in the stent meshes 14 are truncated cone-shaped, that is, when the diameters of two adjacent first rods 141 in the second section 12 in the up-down direction are different, the diameters of two adjacent first rods 141 in the second connecting section 112 in the up-down direction are different, and the diameters of two adjacent first rods 141 in the third section 13 in the up-down direction are different, the diameter of the first rod 141 in the middle of the second section 12 is the largest, the diameters of the first rods 141 in the stent meshes 14 extending in the up-down direction are gradually reduced, so that the diameters of the first rods 141 in the plurality of stent meshes 14 are gradually reduced from the middle to the upper and lower sides as a whole, and the diameters of the first rods 141 in the stent meshes 14 in the left-right direction may be determined according to the heights of the first rods 141 in the up-down direction. The diameter R2 of the first rods 141 in the second segment 12 is the sum of the diameters of all the first rods 141 in the second segment 12 divided by the number of the first rods 141 in the second segment 12, i.e., the average of the diameters of all the first rods 141 in the second segment 12 is taken. The diameter R1 of the first rods 141 in the second connection section 112 is the sum of the diameters of all the first rods 141 in the second connection section 112 divided by the number of the first rods 141 in the second connection section 112, i.e. the average value of the diameters of all the first rods 141 in the second connection section 112 is taken. The diameter R3 of the first rods 141 in the third section 13 is the sum of the diameters of all the first rods 141 in the third section 13 divided by the number of the first rods 141 in the third section 13, i.e. the average value of the diameters of all the first rods 141 in the third section 13 is taken.

According to the embodiment of the invention, the diameter of the first rod 141 in the second connecting section 112 and the third section 13 is gradually decreased, so that the bending force to be born by the second section 12 is reduced, and the diameter of the first rod 141 in the second section 12 is larger than the diameter of the first rods 141 in the second connecting section 112 and the third section 13, i.e. the diameter of the first rod 141 in the second section 12 is larger than the diameter of the first rods 141 in the second connecting section 112 and the third section 13 is gradually decreased, so that the bending resistance of the second section 12 is improved, and further the wall adhesion performance of the stent main body 1 is improved.

It should be noted that, the diameter of the first rod 141 may be the diameter of the first rod 141 by taking the average value of the diameters of the upper end and the lower end of the first rod 141, or may be the diameter of the first rod 141 by taking the average value of the diameters of the upper end, the middle position and the lower end of the first rod 141.

For example, R1= R3=0.4R2, R1= R3=0.65R2, R1= R3=0.8R2, R1= R3=0.88R2, and R1= R3=0.95R2, by dividing the length of the stent body 1 in the up-down direction and making different values for the diameter size of the first rod 141 in different segments, the stent body 1 can better adapt to blood vessels with different diameters, and simultaneously, the radial support force of the stent body 1 at the proximal end and the distal end of the blood vessel can be more balanced.

In the embodiment of the invention, the lengths of the second connecting section 112, the second section 12 and the third section 13 in the vertical direction are adjusted to adjust the number of the first rods 141 in the second section 12, so that the stent main body 1 integrally presents a teeterboard model, that is, the diameters of the first rods 141 of the second connecting section 112 and the third section 13 are smaller than the diameter of the first rods 141 in the second section 12, so that the acting force exerted on the second section 12 by the second connecting section 112 and the third section 13 is reduced, the bending resistance of the second section 12 is improved, and the wall adhesion performance of the stent main body 1 is further improved.

For example, the arrangement in which the diameters of the second rods 142 and the third rods 143 in the same stent lattice 14 are the same, and the diameters of the second rods 142 and the third rods 143 are smaller than the diameter of the first rods 141, and the differential arrangement of the diameters of the first rods 141 in different stent lattices 14 improve the adherence performance and the stronger radial support force of the stent body 1 in the tortuous blood vessels.

For example, the diameters of the second rod 142 and the third rod 143 in the same stage are set to be the same, and the diameters of the second rod 142 and the third rod 143 in different stages may be set to be the same or different.

In some embodiments, the diameter of the second connecting segment 112 is R4, the diameter of the second segment 12 is R5, the diameter of the third segment 13 is R6, and R4: R5: R6= (0.6-0.9) = (1.1-1.5).

Specifically, as shown in fig. 3, the stent main body 1 has a tubular lattice structure as a whole, the diameter R4 of the second connecting section 112 is the dimension of the second connecting section 112 in the left-right direction, the diameter R5 of the second section 12 is the dimension of the second section 12 in the left-right direction, and the diameter R6 of the third section 13 is the dimension of the third section 13 in the left-right direction.

For example, the diameter R4 of the second connecting section 112 may be a dimension of the middle position of the second connecting section 112 in the vertical direction in the left-right direction, the diameter R5 of the second section 12 may be a dimension of the middle position of the second section 12 in the vertical direction in the left-right direction, and the diameter R6 of the third section 13 may be a dimension of the middle position of the third section 13 in the left-right direction in the vertical direction. The diameter R4 of the second connecting section 112 may be an average value of the upper end diameter and the lower end diameter of the second connecting section 112, the diameter R5 of the second section 12 may be an average value of the upper end diameter and the lower end diameter of the second section 12, and the diameter R6 of the third section 13 may be an average value of the upper end diameter and the lower end diameter of the third section 13, and the present invention does not specifically limit the diameter of the second connecting section 112, the diameter of the second section 12, and the diameter of the third section 13, and all of the protection ranges of the embodiments of the present invention as long as the increasing arrangement from the third section 13 to the first section 11 can be satisfied.

For example, R4: R5: R6=0.6 = 1.1, R4: R5: R6= 0.6.

It should be noted that, because the wall of the distal end blood vessel is thinner and weaker than that of the proximal end blood vessel, the diameters of the third section 13, the second section 12 and the second connecting section 112 are sequentially increased in an increasing manner in the embodiment of the present invention, so that the radial supporting force after the stent main body 1 is released is more balanced, the force value of the stent main body 1 acting on the distal end blood vessel and the force value acting on the proximal end blood vessel tend to be consistent, and the intimal injury of the distal end blood vessel caused by the thrombus removal stent 120 is reduced.

As shown in fig. 4 to 6, in the embodiment of the present invention, the stent main body 1 is set to the spirally-raised stent mesh 14, the stent main body 1 is effectively engaged with the thrombus 200 by adjusting the spirally-raised angle, and then the different setting of the first rod 141 and the setting of gradually increasing the diameter of the second connecting section 112, the second section 12 and the third section 13 are compared with the related art in which the embolectomy stent 120 is released in the blood vessel model 300, the embolectomy stent 120 in the embodiment of the present invention can conform to the tortuous blood vessel after being released, pass through the tortuous blood vessel more easily, open and occlude the blood vessel quickly, and have more excellent adherence performance.

In some embodiments, two adjacent stent meshes 14 along the length of the stent body 1 have a helical included angle α of 35 ℃ ≦ α ≦ 65 ℃.

Specifically, the whole stent main body 1 is a spirally rising stent lattice 14, and the thrombus 200 can be better spirally wound by the stent main body 1 by adjusting the spiral included angle between two adjacent stent lattices 14 in the up-down direction, so that the thrombus extraction efficiency of the thrombus extraction stent 120 is improved.

For example, α is selected from the group consisting of 35 ℃, 40 ℃, 45 ℃, 48 ℃, 50 ℃, 54 ℃, 55 ℃, 62.5 ℃, 63 ℃, 64 ℃ and 65 ℃.

In some embodiments, the thrombectomy holder 120 further comprises a developing wire 2 and a developing ring 3, the developing wire 2 is wound around the holder body 1, and the developing ring 3 is disposed on the first segment 11 and the third segment 13, respectively.

Specifically, as shown in fig. 7, the developing rings 3 are respectively provided at the lower end of the first connecting section 111 and the upper end of the third section 13, and the developing wire 2 is wound on the holder main body 1.

For example, 1 developing ring 3 is provided on the first section 11, 3 or 4 developing rings 3 are provided on the third section 13, and 3 or 4 developing wires 2 are wound around the holder body 1 and mixed with the developing rings 3 on the first section 11.

For example, the developing ring 3 may be made of platinum-tungsten alloy, platinum-iridium alloy, gold, or tantalum, and the developing wire 2 may be made of platinum-tungsten alloy or platinum-iridium alloy.

The embodiment of the invention does not limit the number and the material of the developing rings 3 and the developing wires 2, and the practical requirements are taken as the standard.

The delivery system 100 of an embodiment of the present invention includes a thrombectomy support 120 and a delivery body 110. The thrombectomy support 120 is any one of the thrombectomy supports 120 described above. One end of the delivery body 110 is attached to the thrombectomy support 120.

Specifically, as shown in fig. 7 and 8, the upper end of the delivery body 110 is connected to the lower end of the embolectomy stent 120, that is, the upper end of the delivery body 110 is connected to the lower end of the first connecting section 111, and the delivery body 110 delivers the embolectomy stent 120 into the blood vessel.

Optionally, the upper end of the conveying main body 110 is provided with a coating layer 1110, the coating layer 1110 is a polymer sheath, and one or more layers of hydrophobic or hydrophilic coatings, wherein the polymer sheath is made of LDPE, PE, HDPE, PTFE, the coating is made of PTFE, sodium hyaluronate, PVC, and the like, the coating length is 300-1200mm, the thickness of the coating layer 1110 is less than 10um, and by arranging the coating layer 1110 on the conveying main body 110, the irritation of the conveying system 100 to the blood vessel is reduced while the pushing resistance of the conveying main body 110 is reduced. The stent 120 may be coated with a gold or tantalum metal coating to improve the visualization properties of the stent 120, or the stent 120 may be coated with a hydrophilic coating to reduce the pushing resistance of the stent 120 in the blood vessel.

For example, the conveying body 110 and the first connecting section 111 are connected by welding to ensure the stability of the connection between the conveying body 110 and the thrombectomy holder 120, and the conveying performance of the conveying system 100 is improved by the connection between the first connecting section 111 and the conveying body 110.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

It should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art may make variations, modifications, substitutions and alterations to the above-described embodiments within the scope of the present invention.

Claims

1. A thrombus removal support is characterized by comprising a support main body, wherein the support main body comprises a first section, a second section and a third section which are sequentially connected in the length direction of the support main body, the first section, the second section and the third section respectively comprise a plurality of support grids connected with one another, each support grid comprises a first rod, a second rod and a third rod, one end of each first rod is connected with one end of each second rod and one end of each third rod, and the diameter of each first rod in the second section is larger than that of each first rod in the first section and the third section;

the support net divide into the multirow, and the multirow the support net is in link to each other in proper order on the length direction of support main part, each row the support net includes a plurality of edges the support net that the circumference of support main part connected gradually, it is same in the support net the second pole with the diameter of third pole is the same, just the second pole with the diameter of third pole is less than the diameter of first pole.

2. The embolectomy stent of claim 1, wherein the first segment comprises a first connecting segment and a second connecting segment connected in series, the second connecting segment being connected to the second segment, the mesh size of the stent mesh of the second connecting segment being larger than the mesh size of the stent mesh of the first connecting segment.

3. The embolectomy support of claim 1, wherein the first rod has a first connector portion and a second connector portion thereon, the first connector portion being connected to the second rod and the second connector portion being connected to the third rod.

4. The embolectomy stent of claim 2, wherein the length of the second connecting section in the length direction of the stent body is L1, the length of the second section in the length direction of the stent body is L2, the length of the third section in the length direction of the stent body is L3, and L1: l2: l3=1, or, L1: l2: l3=1, or, L1: l2: l3= 1.

5. The embolectomy stent of claim 4, wherein the diameter of the first rod in the second connecting segment is R1, the diameter of the first rod in the second segment is R2, the diameter of the first rod in the third segment is R3, and R1= R3= (0.4-0.95) R2.

6. The embolectomy stent of claim 4, wherein the diameter of the second connecting segment is R4, the diameter of the second segment is R5, the diameter of the third segment is R6, and R4: R5: R6= (0.6-0.9) = (1.1-1.5).

7. The embolectomy support of claim 4, wherein the helical included angle α is between two adjacent support grids along the length direction of the support body, and is 35 ℃ to 65 ℃.

8. The embolectomy support of claim 1, further comprising a developer wire wound around the support body and developer rings disposed on the first and third segments, respectively.

9. A conveyor system, comprising:

a thrombectomy support according to any one of claims 1-8 above;

and one end of the conveying main body is connected with the embolectomy support.