CN111345925B

CN111345925B - Blood vessel support

Info

Publication number: CN111345925B
Application number: CN202010123375.2A
Authority: CN
Inventors: 范振敏; 彭宋双; 徐烨清; 叶霞
Original assignee: Jiangsu University of Technology
Current assignee: Jiangsu University of Technology
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2022-03-25
Anticipated expiration: 2040-02-27
Also published as: CN111345925A

Abstract

The invention relates to a novel blood vessel stent which comprises a plurality of sections of annular adsorption strips, wherein two adjacent sections of adsorption strips are connected through a plurality of connecting structures to form a stent body, each connecting structure comprises a disk body, a connecting rib and a plurality of wedge-shaped blocks fixedly arranged on the disk body, the connecting ribs are rotatably arranged on the disk body, two ends of each connecting rib are respectively and rotatably connected to the adjacent adsorption strips, and the wedge-shaped blocks are used for limiting the reverse movement of the adjacent adsorption strips in the expansion direction. In the process of opening the intravascular stent body, the connecting ribs can move upwards along the inclined surface of the wedge-shaped block, and the connecting ribs fall down and are limited by the wedge-shaped block to move reversely after crossing the highest point of the wedge-shaped block along with the increase of the angle between the two connecting ribs. Because the connecting rib can not stride across the wedge-shaped block and move back again, the blood vessel support body can not be rebounded after being expanded, and the effect of the blood vessel support body on the interventional therapy of the restenosis artery is optimized.

Description

Blood vessel support

Technical Field

The invention relates to the field of vascular interventional medical treatment, in particular to a vascular stent.

Background

Stent intervention, a major method for treating atherosclerosis, improving vascular occlusion and other vascular diseases of interest, is accepted by more and more doctors and patients, and is a tiny reticular structure formed by expanding a stent by using a balloon in a vascular lesion area so as to make blood in the segment of the lumen normally circulate. After the sacculus expansion, the irreversible plastic deformation should take place for the support theoretically to guarantee the operation effect of support intervention art, nevertheless because the material of support, the influence of structure and other aspects, the support still can exist the expansion incomplete, dog bone effect, kick-back scheduling problem after the expansion, thoroughly improve these problems, need follow the current support of structural optimization, consequently, research out a section and solve through changing current supporting structure and kick-back after the expansion, the support of dog bone effect scheduling problem has very important meaning.

Disclosure of Invention

The invention provides a vascular stent, which aims to solve the problem of rebound after expansion of the existing vascular stent, and comprises a plurality of sections of annular adsorption strips, wherein two adjacent sections of adsorption strips are connected through a plurality of connecting structures to form a stent body, each connecting structure comprises a disk body, a connecting rib and a plurality of wedge-shaped blocks fixedly arranged on the disk body, the connecting ribs are rotatably arranged on the disk body, two ends of each connecting rib are respectively and rotatably connected to the adjacent adsorption strips, and the wedge-shaped blocks are used for limiting reverse movement of the adjacent adsorption strips in the expansion direction.

Preferably, every connection structure has two the splice bar, and two splice bar cross arrangement, all be equipped with on the splice bar and prevent two the splice bar mutual interference's the groove of stepping down, the degree of depth in groove of stepping down does half of splice bar thickness, two the groove of stepping down sets up relatively, two the splice bar passes through the rivet riveting and is in on the disk body. The depth of the abdicating groove is half of the thickness of the connecting ribs, so that the lowest positions of the two connecting ribs are flush. And meanwhile, the abdicating groove facilitates the cross rotation of the two connecting ribs, and space is reserved for the rotation of the connecting ribs, so that the rotation is more reliable.

Further, in order to maximize the rotation angle of the connecting rib, the center of the receding groove is concentric with the riveting position.

Preferably, the wedge block includes guide part and spacing portion, the direction of guide part to spacing portion with when the support body expands the splice bar rotation direction is unanimous, adsorb behind the strip expansion spacing portion restriction the splice bar is to the antiport. The guide part can be an arc surface, a curved surface, an inclined surface and the like, and the included angle between the limiting part and the bottom of the wedge-shaped block can be larger than 90 degrees and smaller than 180 degrees.

Furthermore, the height of the limiting part is higher than the thickness of the thinnest part of the connecting rib, and the height of the limiting part is smaller than the thickness of the thickest part of the connecting rib. When the expansion of blood vessel support body, two adjacent absorption strip between apart from the grow promptly, the splice bar begins to rotate, angle grow between two splice bars, and the splice bar removes along the guide part and supports spacing portion until the splice bar, and spacing portion highly is higher than the thickness of the thinnest department of splice bar just is less than the thickness of the thickest department of splice bar guarantees that the wedge blocks stably blocks the splice bar, makes it can not the motion backward to can not kick-back after guaranteeing the support expansion.

Preferably, the guide portion is an inclined surface, the inclined direction of the inclined surface is consistent with the rotation direction of the connecting rib, and the limiting portion is a vertical surface perpendicular to the rotation direction of the connecting rib. The limiting portion is perpendicular to the connecting rib rotating direction is used as an example for explanation, and the limiting portion is perpendicular to the connecting rib rotating direction, namely perpendicular to the disc body, so that the contact surface of the connecting rib and the limiting portion is larger, the wedge-shaped block is guaranteed to stably clamp the connecting rib, and the connecting rib cannot move backwards.

Further, the disc body is 0.03mm in thickness and 0.27mm in radius.

Preferably, the adsorption strip is made of medical stainless steel or nickel-titanium alloy material.

Further, the adsorption strip is wavy.

Has the advantages that: in the process of opening the intravascular stent body, the connecting ribs can move upwards along the inclined surface of the wedge-shaped block, and the connecting ribs fall down and are limited by the wedge-shaped block to move reversely after crossing the highest point of the wedge-shaped block along with the increase of the angle between the two connecting ribs. Because the connecting rib can not stride across the wedge-shaped block and move back again, the blood vessel support body can not be rebounded after being expanded, and the effect of the blood vessel support body on the interventional therapy of the restenosis artery is optimized.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the tie bar of the present invention assembled with a tray (the tie bar has been rotated past a wedge);

FIG. 3 is an overall expanded view of the present invention;

FIG. 4 is a schematic view of the tray structure of the present invention;

1. an adsorption strip; 2. connecting ribs; 3. riveting; 4. a wedge block; 5. a tray body; 6. a guide portion; 7. a limiting part; 8. a yielding groove.

Detailed Description

As shown in the figure, a blood vessel support, including a plurality of sections annular absorption strip 1, adjacent two sections it forms the support body to connect through a plurality of connection structure between the absorption strip 1, connection structure includes disk body 5, splice bar 2 and a plurality of fixed setting and is in wedge 4 on the disk body 5, splice bar 2 rotates and sets up on the disk body 5, just the both ends of splice bar 2 rotate respectively and connect adjacently adsorb on the strip 1, wedge 4 is used for restricting adjacent absorption strip 1 to the reverse motion of expansion direction. (as shown in fig. 1 to 3, the embodiment is described with 8 wedge-shaped blocks 4, and the distances from the 8 wedge-shaped blocks 4 to the center of the disk 5 are equal, that is, two wedge-shaped blocks 4 are disposed on one side of the tie bar 2).

Every connection structure has two

splice bar

2, and 2 cross arrangement of two splice bars, all be equipped with on the splice bar 2 and prevent two 2 mutual interference's of splice bar groove 8 of stepping down, the degree of depth in groove 8 of stepping down does half of 2 thicknesses of splice bar, two the groove 8 of stepping down sets up, two relatively the splice bar 2 is in through 3 rivets on the disk body 5. The center of the abdicating groove 8 is concentric with the riveting position. Wedge 4 includes guide part 6 and spacing portion 7, guide part 6 to spacing portion 7 the direction with during the support body expansion 2 rotation direction of splice bar are unanimous, adsorb 1 expansion back of strip spacing portion 7 restriction 2 are to the antiport of splice bar. The height of the limiting part 7 is higher than the thickness of the thinnest part of the connecting rib 2, and the height of the limiting part 7 is smaller than the thickness of the thickest part of the connecting rib 2. The guide part 6 is an inclined plane, the inclined direction of the inclined plane is consistent with the rotation direction of the connecting rib 2, and the limiting part 7 is perpendicular to the vertical surface of the rotation direction of the connecting rib 2 (as shown in fig. 4, the guide part 6 is an inclined plane, and the limiting part 7 is perpendicular to the vertical surface of the rotation direction of the connecting rib 2). The thickness of the disc body 5 is 0.03mm, and the radius is 0.27 mm. The adsorption strip 1 is made of medical stainless steel or nickel-titanium alloy material. The adsorption strip 1 is wave-shaped.

The working principle is as follows: after the intravascular stent body does not expand or the connecting rib 2 strides over a wedge 4, (as shown in fig. 2, the connecting rib 2 strides over a wedge 4), sacculus when in the blood expands gradually, the adsorption strip 1 opens, the connecting rib 2 can upwards move along the direction of the wedge 4, the connecting rib 2 overturns the inclined plane, the connecting rib 2 falls back to the spacing portion 7 of the wedge 4, the spacing face of the wedge 4 is perpendicular to the direction of rotation, so that the connecting rib 2 can not move reversely, thus, the opening angle of the connecting rib 2 can only be enlarged, and the connecting rib can not be reduced. Therefore, the whole blood vessel support body can be controlled not to rebound after expansion, and the effect of the blood vessel support body on the interventional therapy of the restenosis artery is optimized.

Claims

1. A vascular stent, characterized by: the support comprises a plurality of sections of annular adsorption strips (1), two adjacent sections of adsorption strips (1) are connected through a plurality of connecting structures to form a support body, each connecting structure comprises a tray body (5), a connecting rib (2) and a plurality of wedge blocks (4) fixedly arranged on the tray body (5), the connecting ribs (2) are rotatably arranged on the tray body (5), two ends of each connecting rib (2) are respectively and rotatably connected to the adjacent adsorption strips (1), and the wedge blocks (4) are used for limiting reverse movement of the adjacent adsorption strips (1) to the expansion direction;

each connecting structure is provided with two connecting ribs (2), the two connecting ribs (2) are arranged in a crossed mode, the connecting ribs (2) are respectively provided with a abdicating groove (8) for preventing the two connecting ribs (2) from interfering with each other, the depth of each abdicating groove (8) is half of the thickness of the connecting rib (2), the two abdicating grooves (8) are oppositely arranged, and the two connecting ribs (2) are riveted on the tray body (5) through rivets (3);

the centers of the two abdicating grooves (8) are concentric with the riveting position;

the wedge-shaped block (4) comprises a guide part (6) and a limiting part (7), the direction from the guide part (6) to the limiting part (7) is consistent with the rotation direction of the connecting rib (2) when the support is expanded, and the limiting part (7) limits the connecting rib (2) to rotate reversely after the adsorption strip (1) is expanded;

the guide portion (6) is an inclined surface, the upward direction of the inclined surface is consistent with the rotation direction of the connecting rib (2) when the support is expanded, and the limiting portion (7) is a vertical surface perpendicular to the rotation direction of the connecting rib (2) when the support is expanded.

2. A vascular stent as in claim 1, wherein: the height of the limiting portion (7) is higher than the thickness of the thinnest position of the connecting rib (2), and the height of the limiting portion (7) is smaller than the thickness of the thickest position of the connecting rib (2).

3. A vascular stent as in claim 1, wherein: the thickness of the disc body (5) is 0.03mm, and the radius is 0.27 mm.

4. A vascular stent as in claim 1, wherein: the adsorption strip (1) is made of medical stainless steel or nickel-titanium alloy material.

5. A vascular stent as in claim 1, wherein: the adsorption strip (1) is wave-shaped.