KR102197641B1 - Lumen apposing plastic stent - Google Patents

Abstract

The present invention relates to a lumen joining plastic stent. More specifically, tension applied to the lumen is continuously maintained. Thus, according to a decrease in the size of a cyst (C), a wall of the cyst (C) and an intestinal tract (B) are joined through a pulling force between the intestinal tract (B) and the cyst (C), and the length of a central part (130) is variable. Accordingly, despite a change in the size of the cyst (C), the movement or displacement of a stent does not occur, and contents can be prevented from leaking out. To this end, a stent of the present invention is composed of a body part (100) formed in a tube shape, and the body part (100) comprises: a first fixing part part (110) which is inserted into a cyst (C), is closely placed to the inside of the cyst (C), and crosses a part of one side of the body part (100) to allow one end to be smoothly bent to form a first ring part (115), and capable of changing the size of the first ring part (115); a second fixing part (120) which is inserted into an intestinal tract (B), is closely placed to the inner side of the intestinal tract (B), and crosses a part of one side of the body part (100) to allow one end to be smoothly bent to form a second ring part (125), and capable of changing the size of the second ring part (125) through elasticity; and a central part (130) which is positioned between the first fixing part (110) and the second fixing part (120) and is composed of a linear section.

Description

Plastic stent for lumen bonding{LUMEN APPOSING PLASTIC STENT}

The present invention relates to a plastic stent for lumen bonding, and more specifically, the tension applied to the lumen is continuously maintained and the cyst and the intestinal wall are joined through a force that pulls between the intestine and the cyst as the cyst size decreases. Since the length of the cyst is variable, the stent does not move or dislocate even when the cyst size changes, and the enteral duct drainage for extra-intestinal cystic structures and fluid storage that can prevent the cyst contents or intestinal contents from spilling out. It relates to a plastic stent for lumen bonding.

Percutaneous bile duct stent implantation is a procedure in which the bile duct is accessed through the skin and liver parenchyma when the biliary tract is narrowed or blocked, and then a plastic or metal stent is placed in the narrowed area so that the bile can be discharged into the intestine, which is a normal path. It is a procedure.

In the meantime, percutaneous drainage tube implantation, which is accessed from the outside of the body, has been performed for drainage of cysts outside the intestine, and recently, a metal tube that allows drainage into the gastrointestinal tract, the inside of the body, has been developed and used.

This not only suppresses the entry of various contaminants into the body from outside the body, but also in the case of fluid storage caused by pancreatic fluid or bile, the fluids are introduced into the gastrointestinal tract, which is the path through which the fluids originally pass, and are much physiological and have fewer side effects.

With the commercialization of ultrasonic endoscopes, stent insertion using an endoscope is becoming easier and more active.

In addition, a lumen apposing metal stent (LAMS) that maintains the gap between the two spaces has been developed and is used for cyst and gallbladder biliary drainage.

However, metal stents lack flexibility due to the characteristics of metal tubes, are severely damaged in tissues, and are difficult to insert and thus require plastic stents that can be easily inserted.

1 and 2 are conceptual diagrams showing a conventional plastic stent.

The conventional plastic stent (1) passes through the instrument tube inside the endoscope in a straight line, pierces the intestine (3) and the cyst (2) wall in a straightened state, and the distal attachment is bent in the cyst (2), and the endoscope The proximal attachment from the intestinal tract is also bent to form a round ring in the cyst (2) and intestinal tract (3). This prevents the plastic stent 1 from being separated from both spaces and entering one side.

However, the conventional plastic stent (1), as shown in Figure 2 (a), when inserting the plastic stent (1) into the cyst (2) in the intestinal (3), Figures 2 (b) and 2 ( As shown in c), since the length of the straightened portion of the plastic stent 1 is fixed, there may be a problem of moving to the cyst 2 or the intestine 3 as shown in the arrow.

In addition, as shown in Figure 2 (d), after the contents of the cyst (2) is moved into the intestine (3) through the plastic stent (1), shown in Figures 2 (e) and 2 (f) As the size of the cyst (2) decreases, the distance between the intestinal tract (3) and the cyst (2) increases, and this causes the plastic stent (1) to dislodge, causing the intestinal contents or the contents of the cyst to flow out. Will occur.

Therefore, since such a conventional plastic stent has a fixed straight section consisting of a straight line between the rings at both ends, as the size of the cyst decreases, the two lumens may become distant, resulting in the separation of the plastic stent or leakage of cyst fluid. There is a demand for the development of a plastic stent that is easy to insert while maintaining the distance by pulling.

Republic of Korea Patent Publication No. 10-2016-0121146 (2016.10.19)

The present invention is to solve the above problems, and an object of the present invention is to reduce the size of the cyst during the process of draining the contents of the cyst into the intestine, and when the distance between the cyst and the intestine increases, the stent is removed or the contents of the cyst It is to provide a plastic stent for lumen bonding that can prevent the leakage of.

According to the features of the present invention for achieving the above object, the present invention is a stent consisting of a body portion made of a tube shape including a plurality of through holes through which cyst contents can be introduced or discharged, the body portion , A first fixing part that is inserted into the cyst and adheres closely to the inner side of the cyst, but crosses one part of the body part so that one end is smoothly bent to form the first ring part, and the first fixing part capable of changing the size of the first ring part through elasticity, A second fixing part that is inserted into the intestinal tract and is in close contact with the inside of the intestine, but crosses the other part of the body part so that the other end is bent smoothly to form a second ring part, and the size of the second ring part can be changed through elasticity, the It is located between the first fixing part and the second fixing part, and includes a central part made of a straight section, and the first space part and the second ring part, the radius of which decreases as the size of the cyst decreases and the distance between the intestine and the cyst increases. In the reduced state, it is changed to a large radius so that the distance between the intestine and the cyst is reduced by the elastic force that attempts to open.

And the first fixing portion and the second fixing portion, a first curved portion disposed at the end, a second curved portion bent from the first curved portion and in close contact with the inner side of the cyst or intestine, and a third curved portion bent from the second curved portion And a fourth curved portion bent from the third curved portion and disposed between the third curved portion and the central portion.

In addition, the material of the body is characterized in that it comprises at least one of Teflon, polyethylene, and polyurethane.

In addition, the inner side of the body portion may be made of Teflon, and the outer side may be made of polyethylene.

And the body portion may be made of polyethylene.

In addition, the inner side of the body portion may be made of Teflon, and the outer side may be made of polyurethane.

In addition, the body portion may be made of polyurethane.

At this time, some of the inner circumferential surfaces of the first and second ring portions are coated with Teflon to form a coating layer.

According to the plastic stent for lumen bonding according to the present invention, the tension applied to the lumen is continuously maintained according to the size change of the first and second ring portions, so that the cyst and the intestinal wall are joined, and the length of the central portion is variable, There is an effect of preventing the stent from moving or dislocating and preventing the contents from flowing out.

In addition, according to the present invention, the inside is made of Teflon having excellent elastic strength and the outside is made of polyethylene having elasticity and flexibility, so there is an advantage of excellent elasticity and flexibility.

In addition, according to the present invention, by being composed of polyethylene, it has a strength of preventing tearing of the sac wall with flexibility while maintaining elasticity.

In addition, according to the present invention, there is an advantage of having elasticity through the inner Teflon without damaging the sac wall and having a soft and flexible surface through a double structure made of Teflon and polyurethane on the outside.

In addition, according to the present invention, there is an effect that, through being made of polyurethane having excellent flexibility, it does not damage weak cystic structures, and while the size of the cyst gradually decreases, it can be naturally discharged into the intestine and discharged into the stool.

In addition, according to the present invention, by configuring a part of the body made of polyurethane to be coated with Teflon, it has excellent elasticity without damaging the cyst and the intestinal wall, so that the force that pulls between the cyst and the intestine acts to prevent leakage of contents. It has the effect of maintaining a stable state without moving the stent.

1 and 2 are conceptual diagrams showing a conventional blood vessel,
Figure 3 is a conceptual diagram showing a plastic stent for lumen bonding according to the present invention,
4 is a conceptual diagram showing the coating layer of the plastic stent for lumen bonding according to the present invention,
5 is a conceptual diagram showing the application of the plastic stent for lumen bonding according to the present invention,
Figure 6 is an operation diagram of the plastic stent for lumen bonding according to the present invention,
7 is a modified example of a plastic stent for lumen bonding according to the present invention.

Hereinafter, a plastic stent for lumen bonding according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a conceptual diagram showing a plastic stent for lumen bonding according to the present invention, Figure 4 is a conceptual diagram showing a coating layer of the lumen bonding plastic stent according to the present invention, Figure 5 is an application of the plastic stent for lumen bonding according to the present invention Fig. 6 is a conceptual diagram showing the operation of the plastic stent for lumen bonding according to the present invention, and Fig. 7 is a modified example of the plastic stent for lumen bonding according to the present invention.

3 to 7, the present invention relates to a plastic stent for lumen bonding, and the plastic stent is separated as the distance between the intestine and the cyst increases due to a decrease in the size of the cyst during the process of draining the contents of the cyst. We present plastic stents for lumen junction for drainage of enteral ducts for non-intestinal cystic structures and body fluid storage that can prevent the contents from flowing out of the body.

This plastic stent for lumen bonding can be applied to the drainage of abnormally generated cysts, gallbladder or biliary tract, adjacent gastrointestinal tract, urinary tract and other structures, and prevents leakage of contents and stably drains without deviating from changes in cyst size. There are features that can be.

To this end, the plastic stent according to the present invention comprises a body part 100 formed in a tube shape including a plurality of through holes H through which cyst contents can be introduced or discharged on an outer circumferential surface.

And the body portion 100, basically comprises a first fixing portion 110, a second fixing portion 120, and a central portion 130.

The first fixing part 110 is in close contact with the inner side of the cyst (C), but crosses one part of the body part 100 so that one end is smoothly bent to form the first ring part 115, and through elasticity, the It is made so that the size of the first hook portion 115 can be changed.

A plurality of through holes H are formed in the first fixing part 110, and the contents of the cyst C are introduced through the through hole H formed in the first fixing part 110.

And the second fixing part 120 is inserted into the intestinal tract (B) so as to be in close contact with the inside of the intestinal tract (B), but the other end is bent smoothly to form a second ring part (125). It intersects with the other part of the second ring portion 125 through elasticity is made possible to change the size.

A plurality of through holes H are formed in the second fixing part 120 so that the contents of the cyst C introduced through the through hole H formed in the second fixing part 120 may be discharged. .

In addition, the central part 130 is located between the first fixing part 110 and the second fixing part 120 and serves as a passage through which the contents move, and consists of a straight section and the first hook part 115 ) And the length of the second ring portion 125 is changed according to the change in size.

In addition, the shape of the first ring portion 115 and the second ring portion 125 is not limited and may be formed in a regular width shape such as a triangle or a circle.

As illustrated in FIG. 3, it may be formed in a triangular shape, or may be formed in a circular shape formed by being gently bent as illustrated in FIG. 7.

The first ring portion 115 and the second ring portion 125 have a reduced radius of the cyst (C) as the distance between the intestine (B) and the cyst (C) increases. As the radius increases by the elastic force, the radius is changed to a large radius so that the distance between the intestinal tract (B) and the cyst (C) decreases, and accordingly, the length of the central portion 130 is also variable.

The first fixing part 110 and the second fixing part 120 are curved to have a "6" shape crossing a part of the body part 100, and the first fixing part 110 and the second fixing part 120 is made of a structure that is symmetrical to each other around the central portion 130.

The first and second fixing portions 110 and 120 include the first curved portions 111 and 121, the second curved portions 112 and 122, the third curved portions 113 and 123, and the fourth curved portion 114. , 124).

Specifically, the first fixing portion 110 and the second fixing portion 120 are bent from the first curved portions 111 and 121 disposed at the ends, and the first curved portions 111 and 121, and the cyst (C ) Or a second curved portion (112, 122) in close contact with the inside of the intestine (B), a third curved portion (113, 123) bent from the second curved portion (112, 122), and the third curved portion (113, 123) ), which is bent and bent from, but includes fourth curved portions 114 and 124 disposed between the third curved portions 113 and 123 and the central portion 130, respectively.

More specifically, the first fixing portion 110 includes a first curved portion 111, a second curved portion 112, a third curved portion 113, and a fourth curved portion 114, and the The second fixing part 120 includes a first curved portion 121, a second curved portion 122, a third curved portion 123, and a fourth curved portion 124.

Here, when the first ring portion 115 and the second ring portion 125 are made of a triangle with a lure, the second curved portions 112 and 122 are bent at an angle set from the first curved portions 111 and 121 , The third curved portions 113 and 123 are bent at an angle set from the second curved portions 112 and 122, and the fourth curved portions 114 and 124 are bent at an angle set from the third curved portions 113 and 123. It has a characteristic that crosses a part of the body part 100,

In addition, when the first ring portion 115 and the second ring portion 125 are made of circular rings, the second curved portions 112 and 122 are gently bent from the first curved portions 111 and 121 The third curved portions 113 and 123 are gently bent from the second curved portions 112 and 122, and the fourth curved portions 114 and 124 are gently bent from the third curved portions 113 and 123. There is a characteristic that crosses a part of the body part 100.

Here, the first fixing portion 110 and the second fixing portion 120 have a diameter of 1 to 3 cm, and the central portion 130 is preferably made of 0 to 10 mm, but is not limited thereto.

In addition, the outer diameter of the body portion 100 is preferably composed of 7 to 10 french, but is not limited thereto.

The angle at which the third curved portions 113 and 123 from the second curved portions 112 and 122 are bent is relatively as the distance between the cyst (C) and the intestine (B) increases due to the decrease in the size of the cyst (C). The elasticity acts so that it is changed small and then restored to the original set angle.

Through this, tension is generated between the cyst (C) and the intestine (B), and pulls the cyst (C) toward the intestine (B), thereby narrowing the distance between the cyst (C) and the intestine (B), and allowing the junction to be made. Thus, it is possible to maintain a stable state.

In addition, when the shape of the first ring portion 115 and the second ring portion 125 is made of a triangular shape, the second curved portions 112 and 122 from the first curved portions 111 and 121, and the second curved portion 112 , 122) to the third bent portion (113, 123), the third bent portion (113, 123) to the fourth bent portion (114, 124) is bent smoothly in a state that does not fold so that the passage through which the contents move is not blocked. It must be done.

More specifically, it is preferably made to be bent within the angular range of 30° to 100°.

Here, if the angle is less than 30°, the passage of the contents is blocked, so that the contents are stagnant in the body, which is not preferable.

In addition, the material of the body portion 100 is made of at least one of Teflon, polyethylene, and polyurethane.

Teflon has excellent elastic strength but lacks flexibility, polyurethane has good flexibility but little elasticity, and polyethylene is a material having adequate elasticity and flexibility.

The body portion 100 may be formed of a single layer or a double structure by selecting one or more of Teflon, polyurethane, and polyethylene according to the applied situation.

Here, when elasticity between the intestinal (B) and the cyst (C) space is important, the inner side of the body portion 100 may be made of Teflon, and the outer side may be made of polyethylene.

The double structure made of Teflon and polyethylene has very good elasticity through the inner Teflon, and has flexibility and elasticity through the outer polyethylene.

Through this, it can be applied to the use of insertion into normal structures such as the gallbladder, urinary tract, and adjacent intestines that have a large space and form a cyst.

In addition, the body portion 100 may be made of a single layer of polyethylene. In this case, since the polyethylene has elasticity and flexibility, it is possible to prevent the risk of tearing the bag wall while maintaining a certain elasticity.

That is, when there is a risk of tearing the cyst wall due to excessive elasticity, it may be composed of a single layer of polyethylene.

And when the body part 100 is composed of a double structure such that the inner side of the body part 100 is made of Teflon and the outer side of the body part 100 is made of polyurethane, the outer side is made of polyurethane, so that the surface is soft and the inner side is made of Teflon material without damaging the bag wall. Through the function to maintain a certain elasticity.

In addition, the body portion 100 may be composed of a single layer of polyurethane, in this case, the cystic structure is weak and should not be damaged, or the cyst (C) gradually decreases in size and naturally exits into the intestine (B). Applicable in cases where it must be excreted in stool

Here, a coating layer (L) may be formed by coating Teflon on the surface of a part of the body part 100 made of polyurethane, which is a part of the inner circumferential surface of the first and second ring parts 115 and 125.

More specifically, as shown in FIG. 4, the second curved portions 112 and 122 and the third curved portions 113 and 123 among the inner surfaces of the first ring portion 115 and the second ring portion 125 A Teflon coating layer (L) having excellent elastic strength may be additionally formed on some surfaces.

At this time, the force to be stretched through the Teflon coating layer (L) formed on a part of the bag wall and the intestinal tract (B) wall is not damaged through the polyurethane, so that the second curved parts 112 and 122 and the third curved part 113 123) has the effect of preventing the phenomenon that the third bent portions 113 and 123 are excessively bent from the second curved portions 112 and 122 as the elasticity is applied to return to the original set angle. .

Through this, tension is applied between the cyst (C) and the intestine (B) without damaging the cyst (C) and the intestine (B), so that the cyst (C) and the intestine (B) are quickly joined.

Next, the operation state of the plastic stent for lumen bonding will be described in detail with the drawings.

As shown in Figure 5 (a), the first fixing portion 110 is inserted into the cyst (C) and the second fixing portion 120 is inserted into the intestine (B). Here, the distance between the intestinal tract (B) and the cyst (C) is made in a short distance, and the length of the central part 130 is made relatively short.

As shown in Figure 5 (b), as the contents of the cyst (C) flow into the intestinal tract (B) through a plastic stent, the size of the cyst (C) decreases, and between the cyst (C) and the intestine (B) The distance is increased, and accordingly, the length of the central portion 130 is also relatively long.

Here, the length of the central part 130 disposed between the cyst (C) and the intestine (B) is the first ring part 115 and the second part through the elasticity of the first fixing part 110 and the second fixing part 120. It is not fixed but variable according to the size change of the ring part 125.

Through this, the body part 100 is prevented from moving to the cyst (C) or the intestinal tract (B), or falling out of the cyst (C) or the intestinal tract (B), thereby preventing the cyst contents or intestinal contents from leaking into the abdominal cavity. have.

At this time, as shown in the arrow of Figure 5 (b), since the tension applied to the first fixing portion 110 and the second fixing portion 120 is continuously maintained according to the size change of the cyst (C), the cyst (C) And the walls of the intestine (B) are joined.

In more detail, as shown in FIG. 6 (a), when a plastic stent is inserted into the cyst (C) in the intestine (B), as shown in FIG. 6 (b), the contents of the cyst (C) Through this through hole (H) is introduced into the interior of the body portion (100), the contents of the cyst (C) is moved into the intestine (B).

Through this, as shown in Figure 6 (c), as the size of the cyst (C) decreases and contraction occurs, the central portion 130 as the distance between the cyst (C) and the intestine (B) increases. The length of the first and second curved parts 112 and 122 and the third and third curved parts 113 and 123 decreases, and the size of the first and second hooks 115 and 125 decreases. do.

At this time, as shown in FIG. 6 (d), the first fixing part 110 and the second fixing part 120 generate a force to be restored to their original shape as in the direction of the arrow, and the first fixing part 110 And the tension pulling between the second fixing portion 120 is increased.

Thereafter, as shown in FIG. 6 (e), the cyst (C) and the intestine (B) are attracted to each other through the first ring portion 115 and the second ring portion 125 whose size is changed through elasticity. Forces are applied, bringing the wall between the cyst (C) and the intestinal (B) wall closer.

At this time, the length of the central portion 130 is shortened, and the angle between the second curved portions 112 and 122 and the third curved portions 113 and 123 and the radius of the first and second ring portions 115 and 125 are It gets bigger.

Through this, as shown in FIG. 6 (f), the cyst (C) and the intestine (B) are joined to maintain a stable state without leakage of the contents of the cyst and the stent movement or separation.

The plastic stent according to the present invention has a feature that can be applied to the ultrasound endoscopic treatment for all cystic structures other than the intestine formed by abscesses in the abdominal cavity, pseudocysts caused by pancreatitis, cholecystitis or cholangitis, pancreatic duct stenosis, urinary tract stricture.

As described above, the rights of the present invention are not limited to the embodiments described above, but are defined by what is described in the claims, and various modifications and adaptations within the scope of the rights described in the claims by those of ordinary skill in the field of the present invention It is obvious that you can do it.

100: body 110: first fixing portion
111, 121: first curved portion 112, 122: second curved portion
113, 123: 3rd bend 114, 124: 4th bend
115: first ring part 120: second fixed government
125: second ring portion 130: central portion
B: intestine C: cyst
H: Through hole L: Coating layer

Claims (8)

In the stent consisting of a body portion 100 made of a tube shape including a plurality of through holes (H) through which the cyst contents can be introduced or discharged,
The body portion 100,
It is inserted into the cyst (C) and is in close contact with the inner side of the cyst (C), but one end crosses one part of the body part 100 so as to form the first ring part 115 by smoothly bending the first ring through elasticity. A first fixing part 110 capable of changing the size of the part 115,
It is inserted into the intestinal tract (B) and is in close contact with the inside of the intestinal tract (B), but the other end crosses with the other part of the body part 100 to form a second ring part 125 by bending smoothly, A second fixing part 120 capable of changing the size of the second hook part 125,
It is located between the first fixing portion 110 and the second fixing portion 120 and includes a central portion 130 made of a straight section,
The first ring portion 115 and the second ring portion 125, the size of the cyst (C) is reduced, and as the distance between the intestine (B) and the cyst (C) increases, Plastic stent for lumen bonding, characterized in that it is changed to a large radius so that the distance between the intestinal tract (B) and the cyst (C) is reduced by an elastic force.
The method of claim 1,
The first fixing portion 110 and the second fixing portion 120,
A first curved portion (111, 121) disposed at the end, and a second curved portion (112, 122) bent from the first curved portion (111, 121) and in close contact with the inner side of the cyst (C) or intestine (B), The third curved portions 113 and 123 bent from the second curved portions 112 and 122, and the third curved portions 113 and 123 bent from the third curved portions 113 and 123 and disposed between the third curved portions 113 and 123 and the central portion 130 Luminous joint plastic stent, characterized in that it comprises a fourth curved portion (114, 124), respectively.
The method of claim 1,
The material of the body portion 100 is a plastic stent for lumen bonding, characterized in that comprising at least one of Teflon, polyethylene, and polyurethane.
The method of claim 3,
A plastic stent for lumen bonding, characterized in that the inner side of the body part 100 is made of Teflon, and the outer side is made of polyethylene.
The method of claim 3,
The body portion 100 is a plastic stent for lumen bonding, characterized in that made of polyethylene.
The method of claim 3,
A plastic stent for lumen bonding, characterized in that the inner side of the body part 100 is made of Teflon, and the outer side is made of polyurethane.
The method of claim 3,
The body portion 100 is a plastic stent for lumen bonding, characterized in that made of polyurethane.
The method of claim 7,
A plastic stent for lumen bonding, characterized in that a portion of the inner circumferential surfaces of the first and second ring parts 115 and 125 is coated with Teflon to form a coating layer (L).

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