KR20140065976A - Stent and manufacturing method thereof - Google Patents

Abstract

Provided are a stent and a method for manufacturing the same. The stent is used for medical purposes, and comprises: first wires each having semi-hexagonal mountains and valleys repeatedly formed along a length direction of the stent; and second wires provided to have the same shape as the first wires, wherein the second wires are provided to be symmetrical to the first wires and thus have hexagonal unit cells of which mountains or valleys are respectively contacted with each other. Here, the stent is characterized in that the first wires and the second wires are sequentially repeated in a circumferential direction of the stent. Accordingly, first, the stent of the present invention can endure even a stronger external pressure as compared with the conventional stent. Second, various diameters, materials, repetition periods of mountains and valleys, heights of mountain and valley, and cross-sectional shapes of wires can be selectively used depending on the conditions of patients using the stent, such as inner walls of the blood vessels. Third, various tensile strengths, shrinkage rates, restoring rates, holding strengths, and the like can be obtained through even stents having the same diameter by differently determining at least one of diameters, materials, repetition periods of mountains and valleys, heights of mountain and valley, and cross-sectional shapes of wires of the first and second wires. Fourth, an optimum stent can be manufactured and used depending on the conditions of patients using the stent, such as inner walls of the blood vessels, through the above-described effects.

Description

TECHNICAL FIELD [0001] The present invention relates to a stent,

More particularly, the present invention relates to a stent and a method of manufacturing the stent. More particularly, the present invention relates to a stent and a method of manufacturing the stent. And a method of manufacturing the stent.

Generally, a stent is a medical material used to normalize the flow of blood or body fluids such as blood vessels and gastrointestinal tracts by inserting them into narrowed or clogged areas to prevent occlusion of blood or body fluid.

Various types of stents are used depending on the body part, structure and material of the stent.

Particularly, as a material of the stent, a material such as a metal, a plastic, or a polymer, which is a polymer, is mainly applied. However, in order to withstand the problem of restenosis clogged by the pressure inside the human body, And the like are mainly used.

In addition, since it is required to have a predetermined deformability so as to facilitate insertion into the inside of a human body, a stent having the same shape as a mesh formed of a wire made of a metal is widely used.

However, in the case of a stent formed of a wire made of a metal, it is also required to support the external pressure by being inserted into a blood vessel or a gastrointestinal tract inside the human body, and it is very important to prevent the stent from being deformed.

In addition, a conventional stent has a structure in which band bodies formed along the circumferential direction are arranged at regular intervals and joined together, or a structure in which a circular pipe is machined to form a plurality of grooves.

However, in the conventional stent using a band member, when the length of the stent is long, the joining sites are increased because of a large joining site, and when the length of the stent is short, satisfactory flexibility can not be given.

In addition, a stent for processing a pipe has difficulty in manufacturing a groove by using a laser or the like, and the manufactured stent has a polygonal cross-section, thereby causing a burden on the inner wall of the blood vessel.

KR0852502 10

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a wire having a hexagonal- And a method for manufacturing the same.

It is an object of the present invention to provide a stent for medical use, comprising: a first wire in which a half-hexagonal mountain and a bone are repeatedly formed along a longitudinal direction of the stent; And a second wire which is formed in the same shape as the first wire and is provided to be symmetrical with the first wire so that each of the mountains or the valleys is in contact with each other so as to have hexagonal unit cells, And the two wires are formed so as to be sequentially repeated in the circumferential direction of the stent.

At this time, the inclination angles of the inclined surfaces connecting the mountains and the valleys of the first wire and the second wire are 20 ° to 30 °.

Further, the diameter of the first wire and the second wire has a diameter of 0.04 mm to 0.06 mm.

The material of the first wire and the second wire is at least one selected from the group consisting of stainless steel 316L, a cobalt-chromium alloy, and a nickel-titanium alloy.

Further, the first wire and the second wire are made of different diameters.

Further, the first wire and the second wire are made of different materials.

Also, at least one of the repetition period and the height is different between the mountain and the valley of the first wire and the mountain and the valley of the second wire.

Further, the first wire and the second wire are welded and welded to each other.

In addition, welding is laser spot welding.

It is another object of the present invention to provide a method of manufacturing a medical stent, comprising the steps of: a) forming a wire so as to have a half-hexagonal mountain and a bone along the longitudinal direction of the stent; A second step of disposing a plurality of shaped wires along the circumferential direction of the stent; And a third step of welding and joining the contacts of the disposed wires. ≪ RTI ID = 0.0 > [10] < / RTI >

In this case, the first step is a step (1-1) of forming the wire so as to have a hexagonal-shaped mountain and a valley through press molding; And a second step of cutting the formed wire.

Further, in the second step, the wires arranged along the circumferential direction of the stent are repeatedly arranged so as to cross the first wires and the second wires symmetrical to the first wires.

The present invention has the following effects.

First, it has the effect of being able to withstand stronger external pressures compared with existing stents.

Second, there is an effect that the diameter, material, the repetition period of the mountain and the bone, the height of the mountain and the bone, and the cross-sectional shape of the wire can be selectively used depending on the condition of the patient such as the inner wall of the blood vessel of the patient using the stent.

Third, since at least one of the diameter and the material of the first wire and the second wire, the repetition period of the mountain and the bone, the height of the mountain and the bone, and the sectional shape of the wire are made different from each other, various tensile strength, The recovery rate and the support strength can be obtained.

Fourthly, according to the above-described effect, an optimal stent can be manufactured and used according to the condition of the patient such as the inner wall of the blood vessel of the patient using the stent.

Fifth, by disposing the wires in the longitudinal direction rather than in the circumferential direction of the stent, the bonding site is reduced, and the manufacturing cost and manufacturing time of the stent can be reduced.

Sixth, the stent can be easily manufactured even if the first wire and the second wire are made of different kinds.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, And shall not be interpreted.
1 is a perspective view of a stent according to the present invention,
2 is a developed view of a stent according to the present invention,
3 is a top view of a wire according to the present invention,
4 is a plan view showing a unit cell of a stent according to the present invention,
5 is a plan view showing a deformation state of the stent according to the present invention,
FIG. 6 is a schematic view showing a method of manufacturing a stent according to the present invention,
FIG. 7 is a flowchart sequentially illustrating a method of manufacturing a stent according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Configuration of Stent>

FIG. 1 is a perspective view of a stent according to the present invention, and FIG. 2 is a developed view of a stent according to the present invention. 1 and 2, the stent 10 according to the present invention includes a first wire 100 and a second wire 100, which are repeatedly refracted in a half hexagonal shape along the longitudinal direction of the stent 10, And a second wire 200 arranged to be symmetrical with the first wire 100. Since the first wire 100 and the second wire 200 are symmetrical only in the arrangement thereof, the first wire 100 and the second wire 200 will be described simultaneously .

3 is a plan view of a wire according to the present invention. As shown in FIG. 3, the first wire 100 and the second wire 200 bend the wires 100 and 200 having a diameter of 0.04 to 0.06 so that the mountain and the bone are repeated. In this case, the widths of the mountains and the valleys are 0.5 mm to 1.5 mm, the height of the mountains from the valley is 0.2 mm to 0.4 mm, the inclination angle? Of the slopes connecting the mountains and the valleys is inclined at an angle of 20 to 30 degrees, The length is 2.5 mm to 4 mm. The width of the mountain and the bone, the height from the mountain to the bone, the inclination angle? Of the inclined plane, the length of the inclined plane, and the like can be variously changed according to the usage of the stent 10. The bending method may be any method, but it is preferable to bend the bending method using the press apparatus 500.

The material of the first wire 100 and the second wire 200 may be any material, but it is preferable to use metal, plastic or polymer, more preferably stainless steel 316L, cobalt-chromium alloy Co-Cr Alloy) or a nickel-titanium alloy (Ni-Ti alloy).

In order to minimize the burden on the inner wall of the blood vessel, the cross section of the first wire 100 and the second wire 200 is preferably a circular cross-section wire, but a polygonal wire may be used depending on the usage. The cross section of the first wire 100 and the second wire 200 may be variously selected according to the user's selection.

4 is a plan view showing a unit cell of the stent according to the present invention. 1 and 2, the first wire 100 and the second wire 200 may include a first wire 100 and a second wire 200, which are formed along the longitudinal direction of the stent 10, Are arranged so as to be sequentially repeated in the circumferential direction of the stent 10 so as to be symmetrical so as to have hexagonal unit cells as shown in Figs. 2 and 3. The contact and contact surfaces of the first wire 100 and the second wire 200 which are repeatedly arranged are coupled. At this time, the connection of the contact points and the contact surfaces of the first wire 100 and the second wire 200 may be combined by using any method. Preferably, one side of the contact point and the contact surface is used as the welding point 300, Spot-welding, and more preferably laser spot-welding.

5 is a plan view showing a deformation state of the stent according to the present invention. In the stent 10 having the above-described configuration, each unit cell has a hexagonal shape as shown in FIGS. 4 and 5, and when a device such as a catheter is used for insertion into a blood vessel or the like, When pressure is applied inwardly from the circumferential direction of the stent 10, the diameter of the stent 10 is reduced and contracted as shown in Fig.

Then, as the stent 10 is discharged from the inside of the blood vessel to the outside of the catheter, the external pressure is relieved and restored to its original size through the restoring force of the wires 100 and 200, thereby supporting the inside of the blood vessel to prevent blood vessel contraction.

(Modified example)

The stent 10 according to a modification of the present invention has a configuration similar to the above-described configuration as a whole. However, depending on the usage of the stent 10, the diameter, the material, the repetition period of the mountain and the bone, the height of the mountain and the valley of the first wire 100 and the second wire 200, At least one of them is formed differently. Through such deformation, the stent 10 can obtain various tensile strengths, shrinkage rates, restoration rates, and support strengths.

Further, one or more wires different from the first wire 100 and the second wire 200 may be additionally provided according to the use mode, and the wires may be sequentially arranged in an alternating arrangement.

<Manufacturing Method of Stent>

FIG. 6 is a schematic view showing a method of manufacturing a stent according to the present invention, and FIG. 7 is a flowchart sequentially showing a method for manufacturing a stent according to the present invention.

6 and 7, a stainless steel 316L, a wire made of one material selected from the group consisting of a cobalt-chromium alloy and a nickel-titanium alloy, and having a diameter of 0.04 mm to 0.06 mm, ). At this time, the material and diameter of the wires 100 and 200 can be variously selected in consideration of the tensile strength, shrinkage, restoration rate, and supportability of the stent 10 to be used. In addition, two or more different wires may be prepared according to the first wire 100 and the second wire 200 to be described later.

Next, the wires 100 and 200 are formed so that a half-hexagonal mountain and a valley are repeatedly formed along the longitudinal direction of the wires 100 and 200 (S100). The wire forming step will be described in more detail as follows.

A plurality of obstacles are formed along the longitudinal direction of the wires 100 and 200 through a press forming process using a press apparatus 500 having a die corresponding thereto so that a hexagonal mountain and a bone can be formed on the wires 100 and 200, So that the bone is repeatedly formed (S110). At this time, the wires 100 and 200 may process the wires 100 and 200 corresponding to the length of the stent 10, but they are repeatedly press-formed by the length of the wires 100 and 200 for manufacturing efficiency It is possible to form mountains and valleys as a whole on the long wires 100 and 200.

Next, the wire forming step is completed by cutting the wires 100 and 200 formed along the longitudinal direction with the length of the stent 10 to be used (S120). If the length of the wires 100 and 200 coincides with the length of the stent 10 to be used in the wire forming step S110, the wire cutting step S120 may be omitted.

Next, a plurality of the formed wires 100 and 200 are arranged along the circumferential direction of the stent 10 so as to correspond to the diameter of the stent 10 to be used (S200). At this time, the wires 100 and 200 are arranged in such a manner that the first wires 100 and the second wires 200 are repeatedly arranged to be symmetrical with each other. The first wire 100 and the second wire 200 are formed using the same wire 100 and 200. However, for convenience of explanation, the reference wire is referred to as a first wire 100, Is called a second wire (200). The unit cells of the stent 10 are formed in a hexagonal shape by arranging a plurality of the first wires 100 and the second wires 200 repeatedly, and the overall developed view of the stent 10 becomes honeycomb.

In addition, the first wire 100 and the second wire 200 may be formed so that at least one of the diameter, the material, the repetition period of the mountain and the bone, the height of the mountain and the valley, and the cross- It is possible. In addition, depending on the usage, at least one or more different kinds of wires different from the first wire 100 and the second wire 200 may be added to form the first wire 100, the second wire 200, It is also possible to arrange them in an alternating manner. As described above, even if the first wire 100 and the second wire 200 are manufactured differently or by using different kinds of wires, even if the stent 10 of the same diameter is used, various tensile strength, shrinkage, And so on.

Finally, the manufacturing of the stent 10 is completed by welding the contact points and the contact surfaces of the first wire 100 and the second wire 200 as welding points 300 (S300). The welding of the first wire 100 and the second wire 200 is preferably performed by spot welding using a laser, but other welding methods or joining methods may be used if necessary.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: stent
100: first wire
200: second wire
300: Welding point
500: Press apparatus
θ: inclination angle of slope connecting mountain and valley

Claims (12)

In a stent for medical use,
A first wire in which a half-hexagonal mountain and a bone are repeatedly formed along the longitudinal direction of the stent; And
And a second wire having the same shape as that of the first wire and provided so as to have hexagonal unit cells such that each of the mountains or valleys is in contact with each other so as to be symmetrical with the first wire,
Wherein the first wire and the second wire are formed so as to be sequentially repeated in the circumferential direction of the stent. The method according to claim 1,
Wherein an angle of inclination of an inclined surface connecting the mountains and the valleys of the first wire and the second wire is 20 to 30 degrees. The method according to claim 1,
Wherein the diameter of the first wire and the second wire has a diameter of 0.04 mm to 0.06 mm. The method according to claim 1,
Wherein the material of the first wire and the second wire is at least one selected from the group consisting of stainless steel 316L, a cobalt-chromium alloy, and a nickel-titanium alloy. The method according to claim 1,
Wherein the first wire and the second wire are of different diameters. The method according to claim 1,
Wherein the first wire and the second wire are made of different materials. The method according to claim 1,
Wherein an acid and a bone of the first wire and an acid and a valley of the second wire are formed so that at least one of the repetition period and the height is different from each other. The method according to claim 1,
And one side of the first wire and the second wire, which are in contact with each other, are welded to each other. 9. The method of claim 8,
Wherein the welding is laser spot welding. A method of manufacturing a medical stent,
A first step of forming a wire so as to have a half-hexagonal mountain and a bone along the longitudinal direction of the stent;
A second step of disposing a plurality of shaped wires along the circumferential direction of the stent; And
And a third step of welding and joining the contacts of the disposed wires. 11. The method of claim 10,
In the first step,
A step (1-1) of forming the wire so as to have a hexagonal-shaped mountain and a valley through press molding; And
And a second step of cutting the shaped wire. 11. The method of claim 10,
The second step comprises:
Wherein the wires disposed along the circumferential direction of the stent are arranged so that a first wire and a second wire symmetrical to the first wire are repeatedly arranged in a repeated manner.

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