WO2020222363A1

WO2020222363A1 - Stent

Info

Publication number: WO2020222363A1
Application number: PCT/KR2019/010379
Authority: WO
Inventors: 강성권; 이영재
Original assignee: 주식회사 에스앤지바이오텍
Priority date: 2019-04-29
Filing date: 2019-08-14
Publication date: 2020-11-05

Abstract

A stent comprises: a cylindrical stent body, having a peripheral portion, which has a plurality of holes formed on the surface and has a hollow therein; and a cover portion covering the outer peripheral surface of the stent body. The stent body has formed thereon an external flow path which provides a path through which a body fluid secreted from a branch pipe can flow along the length direction of the stent body to the outside of the cover portion. The stent body comprises a curved portion which traverses in the length direction so as to prevent the stent from falling off lengthwise.

Description

Stent

The present invention relates to a stent, and more particularly, to a stent in which an external flow path is formed on a surface of a stent cover in a longitudinal direction, and a bent portion crossing the length direction is formed on the surface of the stent cover.

Through this, in the stent of the present invention, the body fluid secreted from the branch conduit can flow to the outside of the cover part along the length direction of the stent body, and at the same time, it is possible to prevent the stent from deviating in the longitudinal direction.

With the development of medicine, procedures for inserting stents into various human organs such as blood vessels, esophagus and biliary tract are increasing. A stent is a medical device that is inserted into human organs such as blood vessels, esophagus, and biliary tract to resolve strictures caused by blood clots or tumors in organs such as blood vessels, esophagus, and biliary tract to secure a certain inner diameter of blood vessels, esophagus, and biliary tract. As, it is made of shape memory alloy.

On the other hand, unlike human organs consisting of only one tubular shape, when a stricture occurs in a human organ formed in a Y-shape by a branched conduit, the body fluid secreted from the branched conduit is blocked by the stent and cannot flow. There was this.

Therefore, a number of ways to solve the above problems have been proposed, and in Patent Document 1, by forming an external flow path in the longitudinal direction on the cover surface of the stent, the body fluid flowing from the branch conduit in the human organ having a Y-shaped lumen structure flows. A technique has been proposed to enable it. However, since this stent only forms an external flow path in the length direction of the stent, there is a problem that it is not fixed at an exact position such as sliding in the length direction of the stent, but is released.

A number of solutions have been proposed to solve the problem of stent separation, and in Patent Document 2, by forming a plurality of expansion portions formed with a diameter larger than the diameter of the body portion at one end of the body portion having a hollow cylindrical shape, the length A technology for preventing deviation of direction is disclosed. However, this stent requires several methods of stent manufacturing in the process of manufacturing one stent, since the method of weaving the wire when forming the body part and the method of weaving the wire when forming the expansion part are different. Accordingly, there was a problem that the manufacturing method became complicated. In addition, when the stent is inserted into a human organ having a Y-shape, there is a problem that the body fluid secreted from the branched conduit is blocked by the stent and cannot flow.

[ Prior art literature ]

[ Patent Literature ]

(Patent Document 1) Registered Patent Publication 10-1628711

(Patent Document 2) Unexamined Patent Publication 10-2016-0050820

The present invention has been made in view of the above problems, and an object of the present invention is that when a stent is inserted into a Y-shaped human organ, bodily fluid secreted from the branched conduit flows into the conduit along the flow path outside the stent. At the same time, it is to provide a technology for preventing the stent from being installed by forming a bent portion crossing the length direction on the surface of the stent cover.

However, the problem to be solved by the present invention is not limited thereto, and may be variously extended without departing from the spirit and scope of the present invention.

The above object of the present invention is achieved by the following configuration.

The stent of the present invention includes a cylindrical stent body having a circumferential portion having a plurality of holes formed on the surface and a hollow formed therein; And a cover part provided to surround the outer circumferential surface of the stent body, wherein the stent body provides a path through which bodily fluid secreted from the branch conduit flows to the outside of the cover part along the length direction of the stent body. An external flow path is formed, and the stent body may be configured to include a bent portion crossing the length direction so as to prevent deviation of the stent in the length direction.

On the other hand, the bent portion is composed of an expansion portion in which the diameter of the circumferential portion increases as the stent body proceeds in the length direction of the stent body; and a reduction portion in which the diameter of the circumference portion decreases as it proceeds in the length direction of the stent body; I can.

Meanwhile, the expansion portion and the reduction portion may be alternately formed at equal intervals as the stent body proceeds in the longitudinal direction.

Meanwhile, the bent portion may be formed in a zigzag shape along the length direction of the stent body.

Meanwhile, the bent portion may be formed in a serrated shape along the length direction of the stent body.

Meanwhile, the bent portion may be formed by crossing and bending a plurality of metal wires.

Meanwhile, a depression is formed in the circumferential portion of the stent body, the depression is depression in the length direction of the stent body, and the bodily fluid secreted from the branch conduit may flow through the depression in the length direction.

On the other hand, the external flow path has a protrusion formed at the periphery of the stent body, the protrusion protrudes along a longitudinal direction of the stent body, and along a spaced space formed between the stent body and the conduit by the protrusion. The bodily fluid secreted from the branched conduit may flow.

Meanwhile, a plurality of the external flow paths may be provided.

However, the shape and number of the bent portion and the external flow path are given for illustration, and it goes without saying that the present invention is not limited by these shapes and numbers.

According to the present invention, when the stent is inserted into a Y-shaped human organ, bodily fluid secreted from the branched conduit can flow along the flow path outside the stent. Accordingly, while securing the inner diameter of the human body through the stent insertion, it is possible to flow the secretion of all the branch conduit without clogging.

In addition, according to the present invention, it is possible to prevent separation of the installed stent. Accordingly, it is possible to maximize the effect of the procedure by maintaining the stent in the correct position.

1 is an embodiment of the stent according to the present invention, a side view of the stent body.

2 is an enlarged view of a part of FIG. 1.

3 is a side view showing a state covered with a cover on the stent body of the present invention.

4 is a front view of the stent as an embodiment of the stent according to the present invention.

5 is a diagram showing a shape in which a stent is inserted into a Y-shaped conduit.

6 is a cross-sectional view of a prior art stent along A-A'.

7 is a cross-sectional view of the stent of the present invention along A-A'.

8 is a side view showing a form in which the stent of the present invention is inserted into human organs such as blood vessels, esophagus, and biliary tract.

Hereinafter, the present invention will be described in detail so that those of ordinary skill in the art can easily implement the present invention. The present invention may be implemented in a number of different forms, and is not limited to the embodiments described herein.

Various changes may be made to the embodiments described below. The embodiments described below are not intended to be limited to the embodiments, and should be understood to include all changes, equivalents, and substitutes thereto.

The terms used in the embodiments are only used to describe specific embodiments, and are not intended to limit the embodiments. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance the possibility.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

In addition, in the description with reference to the accompanying drawings, the same components are assigned the same reference numerals regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the embodiment, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the embodiment, the detailed description thereof will be omitted.

In addition, for convenience, it will be described using a cylindrical coordinate system to describe the stent structure.

1 is an embodiment of the stent according to the present invention, a side view of the stent body. That is, FIG. 1 is a view of the stent body 10 viewed from the r-z plane. As shown in Fig. 1, the stent 100 according to the present embodiment is formed by crossing and bending wires, and a bent portion 40 and an external flow path 30 throughout the stent by crossing and bending the wires. To form.

Specifically, when crossing the wires, the wires are bent and crossed so that a bend is formed at the crossing point.

As can be seen in FIG. 2, which is an enlarged view of FIG. 1, the part that the wire is bent and rises increases in diameter than the average diameter of the stent, and the part that the wire is bent and descends decreases in diameter than the average diameter of the stent. Is done. As the process of weaving the stent wire proceeds, a bend is formed throughout the stent, and this bend is formed not only in the length direction (z direction) but also along the tangential direction (θ direction).

The curved shape formed along the length direction (z direction) is referred to as a bent portion 40. The bent part 40 is composed of an expansion part 41 and a reduction part 42. The extended portion 41 is a portion that is bent and raised at a point where the stent wire intersects, and has a diameter greater than the average diameter of the stent. On the other hand, the reduction portion 42 is a portion that is bent and descends at the point where the stent wire crosses, and the diameter is reduced than the average diameter of the stent.

As the stent proceeds in the longitudinal direction (z direction), the stent of the present invention prevents separation in the longitudinal direction (z direction), and inserts and fixes the stent in the correct position by the structure in which the expansion and contraction of the diameter is repeated. can do.

8 is a side view showing a form in which the stent of the present invention is inserted into human organs such as blood vessels, esophagus, and biliary tract. In FIG. 8, the stent body 10 and the cover part 20 covered with the cover on the stent body 10 are shown, the expanded part 41 whose diameter is increased than the average diameter of the stent, and the average of the stent Reduced portions 42 whose diameter is reduced than the diameter are repeated and appear at equal intervals.

As shown in Fig. 8, the extended portion 41 of the stent presses the human organ into which the stent is inserted, thereby accurately fixing the stent 100 in the inserted organ, thereby suppressing movement of the stent in the longitudinal direction. And, by maintaining the stent in the correct position, the effect of the stent insertion procedure can be maximized.

3 is a side view showing a state covered with a cover on the stent body 10 of the present invention. As shown in FIG. 1, in the stent body 10, a cell, which is a space between wires, is formed by crossing the wires. When the stent body 10 in this state is inserted into the human body, since the lumen of the human organ to be inserted is narrowed, the pressure in the direction of the center of the stent is increased by the human tissue around the inserted stent body 10. And thus the human tissues protrude into the cell. In the present invention, the above-described human tissue can be prevented from protruding into the stent cell by forming the cover part 20 by covering the cover outside the stent body 10.

4 is an embodiment of the stent according to the present invention, a front view of the stent body. That is, FIG. 4 is a view of the stent body 10 viewed from the r-θ plane, and in FIG. 4, the concave portion 12 and the protrusion 13, which are curved shapes formed along the tangential direction (θ direction), are shown. have.

Specifically, when the stent body 10 is viewed from the r-θ plane, a circumferential portion 11 that is an outer rim of the stent body is shown, and this circumferential portion 11 is less than the average circumference of the stent body 10 Consists of a recessed portion 12 and a protruding portion 13 protruding from the average circumference of the stent body 10.

The recessed portion 12 and the protruding portion 13 are formed by a portion that is bent and raised at a point where the stent wire intersects, and a portion that is bent and lowered, and the outside of the stent in the longitudinal direction (z direction) by this curved structure. A flow path is formed in This is called an external flow path 30. Through this external flow path 30, even when the stent is inserted into the Y-shaped conduit, the bodily fluid secreted from the branch conduit can flow out without being blocked.

It will be described in more detail with reference to FIGS. 5 to 7. 5 is a diagram showing a shape in which a stent is inserted into a Y-shaped conduit. Among the organs of the human body, there are many organs consisting of not only one conduit but also Y-shaped conduit. When a stricture occurs in this Y-shaped conduit, there is also a Y-shaped stent for insertion into the Y-shaped conduit. However, the Y-shaped stent can be mainly used only in radiology departments, and it is difficult to use in internal medicine. Accordingly, there is a need for a technology capable of flowing body fluids in all branch conduits when inserted into a Y-shaped conduit while being usable in all fields.

However, as shown in FIG. 6, which is a cross-sectional view taken along line A-A' of FIG. 5, the prior art stent only guarantees the flow of body fluid secreted from one conduit, and the body fluid secreted from the other branch conduit. There is a problem in that the fluid flow is not smooth because it is blocked by the pressure between the stent and the human organ.

Accordingly, the applicant of the present invention has repeatedly conducted intensive research to derive a cylindrical stent that can be used in both radiology and internal medicine, and at the same time, a stent capable of flowing bodily fluids secreted from all branch conduits when inserted into a Y-shaped conduit.

Specifically, as shown in FIG. 7, which is a cross-sectional view taken along AA′ of FIG. 5, since the stent has a depression 12 and a protrusion 13, the surrounding human organs into which the stent is inserted Even if pressure is applied, a space is generated between the trachea and the stent, and the body fluid secreted from the other branch conduit to which the stent is not inserted can flow through the external flow path 30 which is the spaced space.

The present invention is characterized in providing a curved shape over the entire outer circumferential surface of the stent by being bent and raised or bent down at a portion where the stent wire crosses and bends in the manner of crossing and bending the stent wire.

This characteristic is reflected in the longitudinal direction (z direction) to form the bent portion 40, thereby preventing the stent from being deviated in the longitudinal direction.

In addition, at the same time, the characteristic of providing a curved shape over the entire outer circumferential surface of the stent is reflected in the tangential direction (θ direction) by bending the stent wire to rise or bend down at the intersection, thereby forming the outer flow path 30 Accordingly, even when the stent of the present invention is inserted into a human organ in the shape of a Y-shaped conduit, the flow of bodily fluid secreted from the branch conduit can be ensured.

In particular, the expansion part 41 and the reduction part 42 may be alternately formed at equal intervals as the stent 100 proceeds in the length direction of the main body 10.

In addition, the bent portion 40 may be formed in a zigzag shape or a sawtooth shape along the length direction of the stent 100 main body 10.

In addition, the external flow path 30 may be provided in plurality.

[ Description of sign ]

100: stent

10: stent body

11: circumference

12: depression

13: protrusion

20: cover

30: external euro

40: bend

41: extension

42: reduction part

Claims

As the stent 100,

A plurality of holes are formed on the surface, a hollow is formed inside, the cylindrical stent 100 having a circumferential portion 11, the main body 10; And

Includes; a cover part 20 provided to surround the outer circumferential surface of the stent 100 body 10,

In the main body 10 of the stent 100, a path through which bodily fluid secreted from the branching conduit 200 can flow out of the cover part 20 along the length direction of the main body 10 of the stent 100 is provided. An external flow path 30 is formed to provide,

The stent 100 body 10 is configured to include a bent portion 40 crossing the length direction so as to prevent the stent 100 from deviating in the longitudinal direction, the stent 100.
The method of claim 1,

The bent portion 40,

As the stent 100 proceeds in the longitudinal direction of the main body 10, an extension 41 in which the diameter of the circumferential portion 11 increases; And

As the stent 100 proceeds in the longitudinal direction of the main body 10, the diameter of the circumferential portion 11 decreases with a reduced portion 42; consisting of, the stent 100.
The method of claim 2,

The expansion part 41 and the reduction part 42 are alternately formed at equal intervals as the stent 100 proceeds in the length direction of the main body 10, the stent 100.
The method of claim 1,

The bent portion 40 is formed in a zigzag shape along the length direction of the stent 100 body 10, the stent 100.
The method of claim 1,

The bent portion 40 is formed in a serrated shape along the length direction of the stent 100 main body 10, the stent 100.
The method of claim 1,

The bent portion 40 is formed by crossing and bending a plurality of metal wires, the stent 100.
The method of claim 1,

A depression 12 is formed in the peripheral portion 11 of the stent 100 body 10, the depression 12 is depression in the longitudinal direction of the stent 100 body 10, the The stent 100 through which the bodily fluid secreted from the branch conduit 200 flows through the recessed portion 12 in the longitudinal direction.
The method of claim 1,

In the outer flow path 30, a protrusion 13 is formed on the circumferential portion 11 of the stent 100 main body 10, and the protrusion 13 is a longitudinal direction of the stent 100 main body 10 The stent 100 protrudes along the protrusion 13 and through which the bodily fluid secreted from the branch conduit 200 flows along a spaced space formed between the main body 10 and the conduit by the protrusion 13.
The method of claim 1,

The external flow path 30 is a stent 100 provided in plurality.