KR20190085574A - Improved stent with external flow path - Google Patents

Abstract

The present invention relates to an improved stent having an exterior flow path, comprising: a stent main body which has flexible wires, having a predetermined length and capable of expanding and contracting, crossed to each other to form a net body, and comprises a circumference unit having a hollow therein; and a cover unit which covers an outer circumference of the stent body. The stent body comprises a plurality of exterior flow paths which are installed in a conduit to provide a path where a body fluid secreted from branch conduit flows in the longitudinal direction of the stent main body to the outside of the cover unit. A recess unit and a protrusion unit are repeatedly formed along the circumference unit of the stent main body, and the body fluid secreted from the branch conduit flows through a space formed between the stent main body and the conduit by the diameter difference of the recess unit and the protrusion unit. The exterior flow paths of the stent main body have a plurality of spiral exterior flow paths in which the recess unit and the protrusion unit are formed in a spiral shape in the longitudinal direction along the circumference unit of the stent main body. Such present invention makes the body fluid secreted from the branch conduit smoothly flow through the space formed between the stent main body and the conduit after transplant procedure, and increases friction force due to relatively large contact area with the conduit such that the stent is not moved from an initial transplant point and can be used for a relatively long time.

Description

Improved stent with external flow path < RTI ID = 0.0 >

The present invention relates to an improved stent in which an external channel is formed. More specifically, the present invention relates to an improved stent in which a flow of body fluid secreted through the branch conduit through a spaced space formed between a stent body and a conduit, The present invention relates to an improved stent in which an external flow path is formed that can not be moved at the first transplantation point and can be used for a relatively long time due to an increase in frictional force due to a relatively large area.

In general, when a stenosis occurs due to various causes such as sediment in a conduit which needs to secure a certain inner diameter such as a blood vessel, esophagus, pancreas or bile duct of a human body, or in the case of a surgical procedure, An expandable stent is inserted. The stent should be smoothly compressed and expanded to facilitate insertion into the catheter.

For this purpose, the stent is formed by crossing a plurality of wires or forming a plurality of holes on the surface by a laser pattern. Therefore, when the stent is placed at the stenosis site, the tissue at the stenosis site protrudes into the stent through the hole of the stent surface due to the pressure caused by the expansion of the stent. Particularly, when the stent is installed for a long time, or when the pressure due to the expansion of the stent is applied to a certain level or more, side effects such as destruction or necrosis of the tissue at the stenotic site occur.

Accordingly, a number of methods for solving the above-mentioned problems have been devised. As a representative example of such a method, there is known a method of forming a film so as to seal the hole of the stent surface. The stent has a plurality of holes each having a rectangular shape on its surface by intersecting a plurality of wires. In order to prevent the tissue at the site of installation from protruding into the stent through the hole, the hole is closed by coating with the whole using silicon or the like. This allows the stent to be stably fixed to the site of installation and to prevent the tissue from projecting into the interior of the stent.

A method of sealing the hole of the stent is to manufacture the stent by dipping in a liquid silicone or the like, or to produce a film of silicone or polyurethane separately and then wrapping it around the outer circumferential surface of the stent, Is fixed to the stent.

However, in the case of using the dipping process in the above-described process, since silicone is applied to the entire area of the stent, the resilient force for returning to the initial state is strongly exerted when it is applied to a bent portion such as a digestive system. In other words, there is a problem in that the flexibility of the stent is poor, causing friction to the lesion and causing inflammation.

In addition, the film-based method has the additional burden of having to undergo a biological test in addition to the stent, as well as the suture in the permission of the medical device. Further, a process of bonding and fixing the film to the stent using the suture is added, .

When the entire area of the stent is closed by using the dipping process or the film using the above-mentioned dipping process or body fluid such as blood or pancreatic juice can flow smoothly into the stent, a bifurcation such as an intrahepatic bile duct, The body fluid flowing into the conduit through the conduit is difficult to flow.

To solve this problem, although a technique of partially sealing the hole of the stent has been proposed, there has been a problem that the tissue protrudes into the stent at the hole portion of the unsealed stent.

In order to solve such a conventional problem, there is provided a stent body including a stent body having a plurality of holes formed in a surface thereof, a hollow portion having a hollow therein, and a cover portion surrounding one side of the outer circumferential surface of the stent body, The stent body is formed with an outer flow path that provides a path through which body fluid secreted from the branch conduit can flow to the outside of the cover portion along the longitudinal direction of the stent body, and the cover portion surrounds one side of the outer circumferential surface of the stent body And a coating layer provided to coat the end portions of the stent body on both sides and fix the film to the stent body, wherein the external flow path is formed with a depression at one side of the periphery of the stent body , The depression is formed along the longitudinal direction of the stent body The outer fluid channel is formed with a protrusion on one side of the circumference of the stent body and the protrusion is formed along the longitudinal direction of the stent body so that the stent body is protruded from the stent body by the protrusion, Wherein the body fluid discharged from the branch conduit flows along a spacing space formed between the catheter and the catheter, and the external flow channel is provided in plurality, and the plurality of external flow channels are formed by repeating depressions and projections along the periphery of the stent body Wherein the depression and the protrusion are formed along the longitudinal direction of the stent body and are separated from each other by the diameter difference between the depression and the protrusion, The body fluid flows, and in order to prevent the stent body from escaping, Wherein the at least one end of the film is formed so as to extend more than the central portion and the coating layer is formed at both end portions of the stent body up to a depth at which the end portion of the film overlaps a certain portion to harden the coating layer, A stent which is fixed to a body so as to be fixed thereto "is disclosed in Patent Registration No. 10-1628711.

However, the conventional stent, in which the depression and protrusion are repeatedly formed along the perimeter thereof, is advantageous in that the flow of body fluid secreted through the branch conduit through the spaced space formed between the stent body and the conduit is favorable, Since only the protruding portion is in close contact with the conduit, the contact area is small so that it is slipped and moved at the first transplantation point.

(1) Korea Patent Registration No. 10-1628711

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems and it is an object of the present invention to provide a stent body having a relatively large contact area with the conduit through the spaced space formed between the stent body and the conduit, And an object of the present invention is to provide an improved stent in which an external flow path is formed which is not moved at the first transplantation point due to increased frictional force and can be used for a relatively long time.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, the present invention provides a stent comprising: a stent body having a plurality of wires each having a predetermined length and being flexible and capable of shrinking and expanding, And a cover portion provided to surround the outer circumferential surface of the stent body. The stent body may be configured such that the body fluid, which is provided in the conduit and is released from the branch conduit, flows to the outside of the cover portion along the longitudinal direction of the stent body A plurality of external flow paths are provided to provide a path through which the depressed portion and the protruding portion are repeatedly formed along the circumferential portion of the stent body and the protruding portion is formed between the stent body and the conduit due to the difference in diameter of the depressed portion and the protruded portion A stent having an outer flow path through which fluid flows from the branch conduit through a spacing space,

The external flow path of the stent body is characterized in that a plurality of helical external flow paths are formed along the circumferential portion of the stent body such that the depressed portion and the protruding portion are spirally formed in the longitudinal direction.

The shape of the stent body is characterized in that the front face is selectively used in a pentagonal, hexagonal, hexagonal, or octagonal shape.

The helical outer flow path of the stent body is characterized by being rotated one to three revolutions along the circumference of the stent body in a clockwise or counterclockwise direction.

As described above, according to the present invention, since the body fluid secreted from the branch conduit is smoothly flowed through the spacing space formed between the stent body and the conduit after the transplantation procedure, the frictional force is increased due to the relatively large contact area with the conduit, It does not move from point to point and can be used for a relatively long time.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged principal perspective view showing an improved stent in which an outer channel is formed according to an embodiment of the present invention;
FIG. 2 is a front view showing a frontal view of an improved stent in which an external flow path is formed,
3 is an enlarged front view enlarging a frontal view of an improved stent in which an external flow path is formed according to an embodiment of the present invention,
FIG. 4 is a right side view showing a right side view of an improved stent in which an external flow path is formed,
FIG. 5 is a plan view showing an improved stent in which an outer channel is formed according to an embodiment of the present invention,
FIG. 6 is an enlarged cross-sectional view of a main part showing an implantable state of an improved stent in which an external flow path is formed according to an embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator, and the like.

Therefore, it goes without saying that the definition should be based on the contents throughout this specification.

FIG. 2 is a front view showing a frontal view of an improved stent in which an outer channel is formed, which is an embodiment of the present invention. FIG. 3 is a cross- FIG. 4 is a right side view showing an improved stent having an outer channel formed therein according to an embodiment of the present invention, and FIG. 5 is a right side view showing an improved stent having an outer channel as an embodiment of the present invention. FIG. 3 is a plan view showing an improved stent in which a channel is formed. FIG.

The improved stent (1) having the outer channel of the present invention has a circumferential portion (12) having a hollow body (12a) formed therein by crossing wires of a certain length capable of self shrinking and expanding, And a cover part 20 provided to surround the outer circumferential surface of the stent body 10. The cover 20 may be formed of a synthetic resin.

The stent body 10 has a circumferential portion 12 having a hollow 12a formed therein and a wire 12a having a predetermined length and capable of being contracted and expanded by itself, And is provided with a helical outer flow path which is provided in the conduit 30 and which provides a path through which body fluids secreted from the branch conduit 31 can flow to the outside of the cover portion 20 along the longitudinal direction of the stent body 10. [ A plurality of spiral protrusions 11a and spiral protrusions 11b along the circumferential portion 12 of the stent body 10 are repeatedly formed in a spiral shape in the longitudinal direction.

As the cover 20, it is preferable to use one of cloth, synthetic resin, rubber, silicone, or polyurethane as a thin film commonly used in the art, but it is preferable to use dipping or coating of silicone or pulley urethane It is needless to say that it may be formed by applying a coating liquid.

The cover portion 20 surrounds the outer circumferential surface of the stent body 10 and closes a plurality of holes formed on the surface of the stent body 10 with a mesh so that the tissue of the stenosed portion can pass through the hole of the surface of the stent body 10, So that it can be prevented from protruding or flowing into the main body 10.

Which is a spacing space formed between the stent body 10 and the conduit 30 due to the difference in diameter between the spiral recess 11a and the spiral protrusion 11b of the spiral outer flow path 11 of the stent body 10, The bodily fluid secreted from the branch conduit 31 flows smoothly through the spiral outer flow path 11 into the conduit 30.

As a matter of course, the shape of the stent body 10 may be selected from a pentagon, a hexagon, a hexagon, and an octagon as viewed from the front.

The shape of the stent body 10 of the present invention will be described by taking an hexagonal shape as an optimal embodiment when viewed from the front.

When the shape of the stent body 10 is a triangular or quadrangular shape as viewed from the front, the area of the helical protrusion 11b of the helical outer flow path 11 and the inner side surface of the conduit 30 is too small, Because there is a greater likelihood of slippage in the implanted position and flow or movement within the conduit 30.

In the case of a square or more shape as viewed from the front, the path of the body fluid of the branch conduit 31 formed between the helical depression 11a of the helical outer flow path 11 and the inner side surface of the conduit 30 The size is too small, and the flow of body fluids is not smooth and may be closed.

It is preferable that the plurality of helical outer flow paths 11 of the stent body 10 are formed by one to three turns in the form of a screw along the circumferential portion 12 of the stent body 10 in the clockwise or counterclockwise direction.

The spiral external flow passage 11 of the stent body 10 according to the present invention will be described as an optimal embodiment in which the spiral external flow passage 11 is formed by two turns in the form of a screw along the circumferential portion 12 of the stent body 10 in the clockwise direction.

When the helical outer flow path 11 is twisted in a threaded manner more than four turns along the circumferential portion 12 of the stent body 10, the helical depressed portion 11a of the helical outer flow path 11 This is because the path of the body fluid of the branch conduit 31 formed between the inner side surfaces of the conduit 30 is too far away to flow the body fluids smoothly and may be closed.

The improved stent 1 having the outer flow path of the present invention has a plurality of helical outer flow paths 11 which are twisted in four or more turns in the form of a screw along the circumferential portion 12 of the stent body 10.

At this time, the spiral outer flow path 11 may be formed so as to have various shapes such as a star shape by repeatedly intersecting the spiral depression 11a and the spiral projection 11b.

That is, the clearance space between the stent body 10 and the inner surface of the conduit 30, which is generated due to the difference in diameter between the spiral depression 11a and the spiral protrusion 11b, becomes an external flow path and is discharged from the branch conduit 31 Is introduced into the conduit 30 and flows in the longitudinal direction of the conduit 30 through the spiral depressed portion 11a of the helical outer flow path 11 spirally twisted in the longitudinal direction of the stent body 10 do.

At this time, the helical depression 11a and the helical projecting portion 11b of the helical outer flow path 11 can be repeatedly formed at regular intervals, and of course, irregularly formed if necessary.

FIG. 6 is an enlarged cross-sectional view of a main part showing an implantation state of an improved stent in which an external flow path is formed according to an embodiment of the present invention.

The helical projecting portion 11b of the helical outer flow path 11 is implanted and brought into close contact with the inner surface of the conduit 30 and the helical recessed portion 11a is spaced from the inner surface of the conduit 30 by a certain distance, The outer flow path 11 is formed.

The improved stent 1 of the present invention having the helical outer flow path 11 is inserted into the stent body 10 and the conduit 30 after the implantation, The flow of the body fluids is more convenient but the contact area with the conduit 30 is relatively large. As a result, the frictional force is increased, so that the surgeon does not move at the first transplantation point and the surgeon can use the relatively improved stent 1 for a longer time .

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.

1: Improved stent
10: stent body
11: Spiral outer flow path
11a: helical depression
11b: spiral projection
12:
12a: hollow
13, 13a: wire
20:
30: conduit
31: Branch conduit

Claims (3)

A stent body having a circumferential portion in which wires having a predetermined length, which are flexible and capable of self-contraction and expansion, intersect each other to form a net, and a hollow is formed therein; And a cover portion provided to surround the outer circumferential surface of the stent body. The stent body may be configured such that the body fluid, which is provided in the conduit and is released from the branch conduit, flows to the outside of the cover portion along the longitudinal direction of the stent body A plurality of external flow paths are provided to provide a path through which the depressed portion and the protruding portion are repeatedly formed along the circumferential portion of the stent body and the protruding portion is formed between the stent body and the conduit due to the difference in diameter of the depressed portion and the protruded portion A stent having an outer flow path through which fluid flows from the branch conduit through a spacing space,
Wherein the outer flow path of the stent body is formed with a plurality of helical outer flow paths having a depression and a projection along the circumferential portion of the stent body in a spiral shape in the longitudinal direction. The method according to claim 1,
Wherein the shape of the stent body is a pentagonal, hexagonal, hexagonal, or octagonal front face. The method according to claim 1,
Wherein the helical outer flow path of the stent body is rotated one to three revolutions along the circumference of the stent body in a clockwise or counterclockwise direction.

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