CN115721462A - Tapered bracket with gradually changed diameter and weaving method thereof - Google Patents

Abstract

The invention relates to a tapered bracket with gradually changed diameter and a weaving method thereof, wherein the bracket is a hollow conical cylindrical structure which is woven by nickel-titanium alloy weaving wires and two ends of which are provided with openings; the two ends are respectively provided with a first opening and a second opening, wherein the diameter of the first opening is larger than that of the second opening, and the bracket is of a conical cylindrical structure with the gradual change from the first opening to the second opening; the conical cylindrical structure is composed of a plurality of diamond grid units which are staggered with each other. This support has the gradual change nature to satisfy the requirement of blood vessel to the support, avoid causing oppression or pathological change to the vascular inner wall and go out to support not in place, gradual change angle size accessible mould is freely controlled, satisfies high gentle and agreeable, and low short and radial support highly laminates to the vascular wall under the condition that satisfies the demand completely.

Description

Tapered bracket with gradually changed diameter and weaving method thereof

Technical Field

The invention relates to the technical field of medical instruments, in particular to a tapered bracket with gradually changed diameters and a weaving method thereof.

Background

The existing stent is generally in a cylindrical shape with the same diameter as the whole, but the diameter of the blood vessel is normally gradually changed, and the diameter is gradually increased or decreased. When implanting a stent of generally the same diameter within a tapered vessel, it may occur that the stent diameter is too small at one end and too large at the other end, which may not only lead to treatment failure but also to serious complications. At present, a few medical companies push out the gradually-changed-diameter conical carved stent, although the stent can be better attached to a blood vessel wall in a gradually-changed blood vessel, the carved stent is inferior to a woven stent in various performances, such as flexibility and pressure resistance, and the carved stent is easy to break, so that the clinical application of the carved stent is limited to a certain extent.

Therefore, in order to solve the above technical problems, the present application provides a tapered stent with a gradually changing diameter and a weaving method thereof, so as to better fit the vascular wall and avoid bleeding and the situation that the diameter of the stent is too small at one end and too large at the other end.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a tapered bracket with a gradually changed diameter and a weaving method thereof. Have the gradual change nature through making the support to satisfy the requirement of blood vessel to the support, avoid causing oppression or pathological change to the vascular inner wall and go out to support not in place, gradual change angle size accessible mould is freely controlled, and this support satisfies high gentle and agreeable, and low foreshortening supports the high laminating to the vascular wall under the condition that satisfies the demand completely, reaches perfect treatment to vascular stenosis treatment, also can accurate release when interveneeing the release.

In order to achieve the above purpose, the technical scheme adopted by the invention comprises the following steps:

a tapered stent comprising: the bracket is a hollow conical cylindrical structure which is woven by nickel-titanium alloy weaving wires and is provided with openings at two ends;

the two ends are respectively provided with a first opening and a second opening, wherein the diameter of the first opening is larger than that of the second opening, and the bracket is of a conical cylindrical structure with the gradual change from the first opening to the second opening;

the conical cylindrical structure is composed of a plurality of diamond grid units which are staggered with each other.

Further, the acute angles of the diamond-shaped grid cells range from 30 ° to 90 °.

Furthermore, the cross section of the nickel-titanium alloy braided wire is circular, and the diameter of the nickel-titanium alloy braided wire is any value between 0.08 mm and 0.2 mm.

The invention also relates to a weaving method of the tapered bracket with the gradually changed diameter, which comprises the following steps:

utilize first weaving silk and second to weave out fretwork and both ends and be equipped with open-ended toper cylindric structure, toper cylindric structure comprises a plurality of crisscross rhombus grid cells each other, includes:

s1, fixing a first end of a first weaving wire, weaving a first row of Z upward semi-rhombic grid units from the first end of the first weaving wire, weaving a second row of semi-rhombic grid units in the right-down direction, wherein the distance from the bottommost end of the semi-rhombic grid units of the second row to the topmost end of the semi-rhombic grid units of the first row is the length of a vertical diagonal line of the rhombic grid units, and Z is a positive integer greater than 1;

s2, forming Y rows of semi-rhombic grid units, weaving the semi-rhombic grid units from the first end of the first weaving wire in the left-upper direction, winding the semi-rhombic grid units woven in the left-upper direction and the semi-rhombic grid units woven in the right-lower direction to form complete rhombic grid units, and connecting the first end of the first weaving wire with the second end of the first weaving wire;

and S3, fixing the second end of the second weaving wire at a position which is half of the length of the horizontal diagonal of the second end diamond-shaped grid unit of the first weaving wire, weaving the first end of the second weaving wire by adopting the same method as the first weaving wire, and winding the second weaving wire and the first weaving wire to form the staggered diamond-shaped grid unit in the weaving process.

The invention has the beneficial effects that:

the invention is based on the traditional stent, the stent has the gradual change property so as to meet the requirement of the blood vessel on the stent, avoid the oppression on the inner wall of the blood vessel or the support of pathological changes from being not in place, the size of the gradual change angle can be freely controlled by a mould, the stent meets the high attachment to the blood vessel wall under the condition that the high flexibility, the low shortening and the radial support completely meet the requirement, the perfect treatment effect on the blood vessel stenosis treatment is achieved, and the accurate release can be realized during the interventional release. This support compliance accessible adjustment structure angle size realizes 90 degrees to 180 degrees crooked, and the shrinkage control is within 30%, and radial holding power also can reach the strength that needs through the adjustment, and the tensile state of support when retrieving presents a complete cylinder and easily retrieves, has fine point-to-point compressive resistance, and whole atress is even. The stent can be used in blood vessels or non-blood vessels (such as trachea, biliary tract, etc.).

Drawings

Fig. 1 is a schematic perspective view of a preferred embodiment of the present invention.

Fig. 2 is a schematic two-dimensional plan view of a preferred embodiment of the present invention, with the stent cut horizontally and deployed flat.

The reference numbers: 1-conical support, 2-first opening, 3-second opening.

Detailed Description

For a clearer understanding of the contents of the present invention, reference will be made to the accompanying drawings and examples.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention provides a tapered bracket with a structure as shown in figures 1 and 2, which is a hollow conical cylindrical structure woven by nickel-titanium alloy weaving wires and provided with openings at two ends;

the two ends are respectively provided with a first opening and a second opening, wherein the diameter of the first opening is larger than that of the second opening, and the bracket is of a conical cylindrical structure with the gradual change from the first opening to the second opening;

the conical cylindrical structure is composed of a plurality of diamond grid units which are staggered with each other.

Preferably, the acute angles of the diamond-shaped grid cells range from 30 ° to 90 °. The number of a row of diamond grid unit alone and the size of diamond grid unit can be adjusted through adjusting diamond grid unit angle size and then this application, and diamond grid unit in this application is also not a uniform, can adjust according to required mechanical properties.

Preferably, the cross-sectional shape of the nickel-titanium alloy braided wire is circular, and the diameter of the nickel-titanium alloy braided wire is any value between 0.08 and 0.2 mm. The adjustable braided stent can be adjusted according to the actual use condition of the braided stent.

This application owing to adopt crisscross rhombus net unit each other, owing to what this application adopted is nickel titanium alloy and weaves the silk, so this application weave the support and can stretch and compress, and the percent shortening control is within 30%. And the braided stent can be correspondingly bent to adapt to the shape deformation of veins and arterial blood vessels, and the bending of 90-180 degrees can be realized by adjusting the angle of the structure. Namely, the stent has flexibility, and the "flexibility" means that the shape of the stent can adapt to the shape of a blood vessel and changes along with the change of the shape of the blood vessel. The stent with good flexibility can have good adherence with blood vessels when being implanted into a lesion part.

The invention provides a second aspect of the above weaving method for a conical stent, which is characterized in that a hollow conical cylindrical structure with openings at two ends is woven by using a first weaving wire and a second weaving wire, the conical cylindrical structure is composed of a plurality of diamond grid units which are staggered with each other, and the method comprises the following steps:

the cylindrical structure that this application formed can adopt the commonly used method in this field to form the cylindrical structure of the rhombus grid unit of crisscross each other, and specifically also can weave with one and form rhombus grid unit, but because this application is to weaving support mechanical properties's consideration, this application adopts two to weave the silk and weaves to form the rhombus grid unit of crisscross each other and ensure the mechanical properties of this application.

S1, fixing a first end of a first weaving wire, weaving a first row of Z upward semi-rhombic grid units from the first end of the first weaving wire, weaving a second row of semi-rhombic grid units in the right-down direction, wherein the distance from the bottommost end of the semi-rhombic grid units of the second row to the topmost end of the semi-rhombic grid units of the first row is the length of a vertical diagonal line of the rhombic grid units, and Z is a positive integer greater than 1;

assuming that the first weaving yarn is woven from left to right, after the first weaving yarn weaves enough semi-rhombic grid cells, the first weaving yarn weaves semi-rhombic grid cells of the second row in the right-down direction, and the weaving process of the semi-rhombic grid cells of the second row does not need to be the same as the weaving process of the semi-rhombic grid cells wound at the lower vertex of the semi-rhombic grid cells of the first row, and the third row is also woven.

S2, after Y rows of semi-rhombic grid units are woven, weaving the semi-rhombic grid units at the first end of the first weaving wire in the left-upper direction, winding the semi-rhombic grid units woven in the left-upper direction and the semi-rhombic grid units woven in the right-lower direction to form complete rhombic grid units, and finally connecting the first end of the first weaving wire with the second end of the first weaving wire;

this application is weaving the first cylindric structure of sufficient required back, and the first silk of weaving begins to weave back, and at the last knitting in-process that turns right, with the half rhombus net unit intertwine that has compiled out and form complete rhombus net unit, owing to passed through the winding, the structural mechanics performance that the first silk of weaving formed can obtain improving simultaneously.

And S3, fixing the second end of the second weaving wire at a position which is half of the length of the horizontal diagonal of the second end diamond-shaped grid unit of the first weaving wire, weaving the first end of the second weaving wire by adopting the same method as the first weaving wire, and winding the second weaving wire and the first weaving wire mutually to form the staggered diamond-shaped grid unit in the weaving process.

The invention has the beneficial effects that: on traditional support basis, make it have the gradual change nature to satisfy the requirement of blood vessel to the support, avoid causing oppression or pathological change to the vascular inner wall and go out to support not in place, gradual change angle size accessible mould is freely controlled, and this support satisfies high gentle and agreeable, and low shortening radially supports and highly laminates to the vascular wall under the condition that satisfies the demand completely, reaches perfect treatment to vascular stenosis treatment, also can accurate release when interveneeing the release. This support compliance accessible adjustment structure angle size realizes 90 degrees to 180 degrees crooked, and the shrinkage control is within 30%, and radial holding power also can reach required strength through the adjustment, and the tensile state of support when retrieving presents a complete cylinder and easily retrieves, has fine point-to-point compressive resistance, and whole atress is even. The stent can be used in blood vessels or non-blood vessels (such as trachea, biliary tract and the like).

The use of "first," "second," and similar terms in the description and claims of this patent does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (4)

1. A tapered stent, comprising: the bracket is a hollow conical cylindrical structure which is woven by nickel-titanium alloy weaving wires and is provided with openings at two ends;

the two ends are respectively provided with a first opening and a second opening, wherein the diameter of the first opening is larger than that of the second opening, and the support is of a conical cylindrical structure with the gradual change from the first opening to the second opening;

the conical cylindrical structure is composed of a plurality of diamond grid units which are staggered with each other.

2. The tapered stent of claim 1, wherein the acute angles of the diamond-shaped lattice cells range from 30 ° to 90 °.

3. The tapered stent of claim 1, wherein said nitinol braided wire has a circular cross-sectional shape and a diameter of any value between 0.08 and 0.2 mm.

4. A method of braiding a tapered stent as claimed in any one of claims 1 to 5, wherein the method comprises:

utilize first weaving silk and second to weave out fretwork and both ends and be equipped with open-ended toper cylindric structure, toper cylindric structure comprises a plurality of crisscross rhombus grid cells each other, includes:

s1, fixing a first end of a first weaving wire, weaving a first row of Z upward semi-rhombic grid units from the first end of the first weaving wire, weaving a second row of semi-rhombic grid units in the right-down direction, wherein the distance from the bottommost end of the semi-rhombic grid units of the second row to the topmost end of the semi-rhombic grid units of the first row is the length of a vertical diagonal line of the rhombic grid units, and Z is a positive integer greater than 1;

s2, forming Y rows of semi-rhombic grid units, weaving the semi-rhombic grid units from the first end of the first weaving wire in the left-upper direction, winding the semi-rhombic grid units woven in the left-upper direction and the semi-rhombic grid units woven in the right-lower direction to form complete rhombic grid units, and connecting the first end of the first weaving wire with the second end of the first weaving wire;

and S3, fixing the second end of the second weaving wire at a position which is half of the length of the horizontal diagonal of the second end diamond-shaped grid unit of the first weaving wire, weaving the first end of the second weaving wire by adopting the same method as the first weaving wire, and winding the second weaving wire and the first weaving wire to form the staggered diamond-shaped grid unit in the weaving process.

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