KR20090038209A - Stent - Google Patents

Abstract

A stent having a composite structure is provided, which maintains the state of expanding the inner cavity by maintaining the inserted stent in the radial direction. A stent having a composite structure comprises: a first weaving part which consists of the elastic member having the mesh structure of cylinder type; an intersection part which has the mesh structure of cylinder type by being arranged in the state that the elastic member is extended from the first weaving part and crossed; and a second weaving part which has the mesh structure of cylinder type while the elastic member is extended from the intersection part and is woven.

Description

Stents

The present invention relates to a stent, and more particularly, to a stent of a complex structure that can be used in the lumen of the human body, and particularly advantageous for cross-inserting the stent at the intersection point for intrahepatic biliary tract.

In general, the function of the biliary system is to provide a passage through which bile is excreted from the liver to the intestine and to regulate bile flow. Bile travels from the left and right hepatic tubes to the gallbladder. The bile concentrated in the gallbladder is released through the bile ducts and finally flows into the intestine through the bile ducts. In particular, when cancer occurs at the intersection of intrahepatic bile ducts, the first stent is first inserted into one side of the intersection and the second stent is inserted through a portion of the side of the body of the first stent. However, the stents inserted into the intersecting portion of the intrahepatic biliary tract generally have a structure in which a thin wire-shaped elastic member repeatedly crosses each other to form a cylindrical mesh. That is, the first stent having the above-described structure is inserted into one side of the biliary tract, and then the second stent is inserted through the side of the first stent. Since the first stent is disposed in the state in which only the elastic members cross each other, the first stent provides a space in which the second stent can be inserted into the side of the first stent while being easily pushed by the crossing point of the elastic member.

However, these stents have a problem that the elastic member is repeatedly crossed with each other to form another mesh stent to penetrate the portion of the mesh form, but the expansion of the stent in the radial direction is weak and can be easily deformed after being installed in the lumen.

Therefore, the present invention has been proposed to solve the above problems, an object of the present invention is to penetrate the side of the body of the stent, another stent can be easily inserted in the crossing state as well as the stents are inserted cross In the state to maintain the expansion force in the radial direction to maintain the state of expanding the lumen to provide a stent to maximize the effect of the stent procedure.

In addition, the present invention can be installed in the intersecting portion of the intra-hepatic can also be installed in the lumen of the general human body to provide a stent having a general purpose by preventing the expansion force is reduced.

In order to achieve the object as described above, the present invention, the first woven portion made of an elastic member forming a cylindrical mesh structure while the ridges and valleys are woven with each other, the elastic member is extended to cross the first woven portion It provides a stent including an intersecting portion arranged in a state to form a cylindrical mesh structure, the elastic member extends from the intersection portion and the other ridges and valleys are woven together to form a second woven portion forming a cylindrical mesh structure. .

The first weaving portion and the second weaving portion are formed in the ridges and the ridges having a path of the elastic member in a zigzag shape and repeated cylindrical shape, the elastic member is wound on each other in the connecting portion overlapping in the path, the connecting portion It extends in a zigzag shape and repeats to form a cylindrical shape is woven with the ridges or the valleys to form another ridges and valleys, the process is preferably repeated to form a cylindrical mesh structure.

Preferably, the elastic member is made of one or two or more.

Preferably, the connection part is made of twisted elastic member.

Preferably, the intersection is disposed between the first and the second weaves.

The intersecting portion is woven with the first woven portion by forming the ridges on the side of the first woven portion, the woven portion is woven with the second woven portion on the side of the second woven portion, the structure in which the elastic member intersects therebetween. It is preferable that the cylindrical mesh structure of.

Preferably, the first weaving part and the second weaving part intersect each other and are interwoven with each other in a longitudinal direction.

Such an embodiment of the present invention is provided with an intersection between the first laced portion and the second laced portion to form a cylindrical mesh structure in which the elastic member intersects, and thus the radial direction is a function unique to the stent through the first laced portion and the second laced portion. Another stent can be inserted through the intersection while maintaining sufficient inflation force. Therefore, the embodiment of the present invention can be easily applied to the intrahepatic bile duct intersection, thereby maximizing the effect of the stent procedure.

The stent of the embodiment of the present invention can be installed in a plurality of intrahepatic bile duct cross sections, as well as can be applied to the lumen of the human body in addition to the intrahepatic bile duct has the effect of varying the scope of application.

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

1 is a perspective view of a stent manufactured according to an embodiment of the present invention, Figures 2 to 10 are views for sequentially explaining the manufacturing process of the stent according to the embodiment of the present invention. First, the stent of the embodiment of the present invention is manufactured by an elastic member in the form of a wire having a thin and long elastic force. In the embodiment of the present invention has been described by showing an example consisting of two such elastic members, it is also possible to consist of one elastic member can be made of a stent with a plurality of elastic members. The elastic member applied to the stent manufactured according to the embodiment of the present invention is preferably made of a coating treatment so that it can be used in the lumen or blood vessels of the human body as well as the intersection of hepatic bile ducts.

The stent of this embodiment of the present invention, as shown in FIG. 1, includes a first laced portion A, an intersection portion B, and a second laced portion C. As shown in FIG.

The first binding portion (A) and the second binding portion (C) is a section for maximizing radial expansion force is preferably the elastic member is woven in the same structure. The first woven portion (A) is bent while forming the ridges (1) and valleys (3) while the elastic member is wound in a cylindrical shape to form a cylinder. The first weaving part (A) is made of a form where the stent is woven together when the ridges 1 and the valleys 3 are adjacent in the longitudinal direction. That is, it is preferable that the elastic member is disposed in a structure in which the peak portion 1 and the valley portion 3 are woven together. Of course, in FIG. 1, the ridge 1 and the valley 3 are enlarged to show an example where the overlapping portions are woven together (indicated by D in FIG. 1), but the first woven portion A is entirely stent. Adjacent to the longitudinal direction of the (1) and valleys (3) form a structure that is fixed in a woven state with each other. The portion where the peaks 1 and the valleys 3 of the first lace-up part A are woven is preferably arranged continuously in the longitudinal direction of the stent. Of course, in the embodiment of the present invention has been described by showing an example in which the ridges 1 and the valleys 3 are woven in the first woven portion (A) arranged in the longitudinal direction of the stent, but is not limited thereto. It is not only possible if the elastic member is combined to form a cylindrical shape by only the ridges 1 and the valleys 3 are woven.

And the intersection portion (B) is the distance between the peaks and valleys of the elastic member extending from the first looped portion (A) described above than the distance between the peaks and valleys of the elastic member in the above-mentioned first looped portion (A) It is preferred to be made larger. For example, if the first weaving portion A has distances p1 and p2 formed by the peak and the valley, the intersection portion B preferably comprises a distance p3 between the peak and the valley. This intersection (B) is a portion adjacent to the first weave (A) is made of ridges. And the intersection portion (B) is a structure in which the valleys formed by the first laced portion (A) and the peaks formed by the intersection portion (B) are bonded to each other by weaving (same as the structure shown in part D of FIG. 1). To achieve. The intersection portion B forms a cylindrical mesh structure by only the intersection of the elastic members in the center portion (indicated by E in FIG. 1). The intersection portion (B) forms the valley portions adjacent to the second laced portion (C).

And the second woven portion (C) forms a mesh structure while the elastic member is extended at the cross-section (B) is bent along the cylinder in a zigzag. And the second weaving portion (C) is made of a structure in which the peaks disposed adjacent to the intersection (B) is intertwined with the valleys provided in the intersection (B). Since the second laced portion (C) is made of the same structure as the first laced portion (A) will be replaced by the description of the first laced portion (A) described above.

Referring to the process of manufacturing the stent according to an embodiment of the present invention in more detail with reference to Figures 2 to 110 as follows. These stents are manufactured using a stent manufacturing frame. The stent manufacturing frame has a cylindrical shape and is provided with a plurality of equally spaced pin holes in the radial direction, and may have a conventional structure in which pins are fitted in the pin holes. Figure 2 shows the expanded stent manufacturing frame. In the exemplary embodiment of the present invention, 18 rows of pins (x1, x2, x3, ..., x18) arbitrarily determined in the length direction of the stent are arranged, and 10 pieces are arranged at equal intervals in the circumferential direction of the stent manufacturing frame. Pins (y7, y8, y9, y10, y1, y2, ..., y7 from the left) are locked. Of course, in the embodiment of the present invention, the arrangement position and the number of pins provided in the stent manufacturing frame are set to an arbitrary number for convenience of description, and the stent may be manufactured using pins constituting various positions and numbers. In FIG. 2, section A is a first loop, a section B is an intersection, and a section C means a second loop.

First, as shown in FIG. 2, the first elastic member 5 has a zigzag path (arrow direction) starting from the pin x1y5 and forming ridges and valleys along the outer circumferential surface of the stent manufacturing frame. Banding is done by moving sequentially from line to line x5. That is, the first elastic member 5 is bent while passing through the pins x1y5, x3y3, x1y1, x3y9, x1y7, x3y5, x1y3, x3y1, x1y9, x3y7, and x1y5. Subsequently, in the section formed by the pins x1y5 and the pins x3y3, the first elastic member 5 may form a kind of strut as the first elastic members are wound and fixed to each other while having overlapping paths (arrow directions). The first elastic member 5 is bent while moving from the pin x3y3 to the x5y1 position.

And the second elastic member 7, as shown in Figure 3, starting from the pin x1y10, forming the ridges and valleys along the outer circumferential surface of the stent fabrication frame and have a path (arrow direction) in a zigzag path (arrow direction) It is moved and banded sequentially from x5 to. That is, the second elastic member 7 is banded while passing through the pins x1y10, x2y9, x1y8, x2y7, x1y6, x2y5, x1y4, x2y3, x1y2, x2y1, and x1y10. At this time, the pin x1y10 and the pin x2y9 section is a section that forms a kind of strut as the second elastic member 7 is wound around each other and fixed while having overlapping paths. The second elastic member 7 is bent while moving from the pin x2y9 to the pins x4y7, x2y5, x4y3, x2y1, x4y9, x2y7, x4y5, x2y3, x4y1, and x2y9. Subsequently, in the section of pin x2y9 to pin x4y7, the second elastic members 7 are twisted with each other and are firmly coupled to form a strut. At this time, the second elastic member 7 is bent in a shape in which the peaks and valleys arranged in the longitudinal direction of the stent are woven together (indicated by the portion D in FIG. 1). Therefore, the first woven portion A formed by the second elastic member 7 is bent in a shape in which the peaks and the valleys are woven together to form a cylindrical mesh structure. This first weaving portion (A) has an excellent expansion force in the radial direction. In addition, since the stretching force in the longitudinal direction is increased due to the first weaving portion A, the thickness of the insertion apparatus for inserting the stent can be reduced.

As shown in FIG. 4, the first elastic member 5 is bent to form a peak and a valley while passing from pin x5y1 to pins x3y9, x5y7, x3y5, x5y3, x3y1, x5y9, x3y7, x5y5, and x3y3. Subsequently, in the pin x3y3 to the pin x5y1 section, the first elastic members 5 are twisted with each other and are firmly coupled to form a strut. At this time, the first elastic member 5 is bent in a shape in which the peaks and valleys arranged in the longitudinal direction of the stent are woven together (indicated as part D in FIG. 1). Therefore, the first woven portion A formed by the first elastic member 5 is bent and joined in a shape in which the peaks and valleys are woven together to form a cylindrical mesh structure. This first weaving portion (A) has an excellent expansion force in the radial direction. Subsequently, the first elastic member 5 is bent by the pin with a moving path from the pin x5y1 to the pin x14y7.

Subsequently, as shown in FIG. 5, the second elastic member 7 has a moving path from pins x4y7 to pins x5y6, x4y5, x5y4, x4y3, x5y2, x4y1, x5y10, x4y9, x5y8, and x4y7. Is banded. And the second elastic member 7 is moved to the pin x5y6 is wound with each other to form a strut. The second elastic member 7 is bent while moving to the pin x14y2.

As shown in FIG. 6, the first elastic member 5 is moved and banded by pins x14y7, x5y3, x14y9, x5y5, x14y1, x5y7, x14y3, x5y9, x14y5, and x5y1. In this case, the first elastic member 5 is woven and banded at a portion where the valley portion (eg, pin x5y3) of the first laced portion A and the peak portion (eg, pin x5y3) of the crossing portion B meet. . That is, the hills formed by the crossing portion B and the valleys formed by the first laced portion A are fixed to each other by being tied together. Subsequently, the first elastic member 5 is bent with a moving path passing through the pins x5y1, x14y7, and x15y6. The first elastic member 5 has a structure that crosses each other (indicated by E in FIG. 1) in this section, and the cylindrical shape has a mesh shape. Since the first elastic members 5 are not fixed at the crossing portion B, holes may be formed while being easily pushed. Such a structure can easily insert another stent to the side as described above.

As shown in FIG. 7, the second elastic member 7 is moved and banded with the path of pins x14y2, x5y8, x14y4, x5y10, x14y6, x5y2, x14y8, x5y4, x14y10, and x5y6. At this time, the second elastic member 7 is banded while being woven at a portion where the valley portion (eg, pin x5y8) of the first lace-up portion A and the peak portion (eg, pin x5y8) of the crossing portion B meet. . That is, the hills formed by the crossing portion B and the valleys formed by the first laced portion A are held together by being tied together. Subsequently, the second elastic member 5 has a path moving to the pins x14y2 and x16y10 and is bent.

The second elastic member 7 has a structure in which the intersection portion B crosses each other (denoted by E in FIG. 1) in the section B, and has a cylindrical shape of a mesh. Since the second elastic members 7 are not fixed at the crossing portion B, holes may be formed while being easily pushed. Such a structure can easily insert another stent to the side as described above.

As shown in FIG. 8, the first elastic member 5 is bent while passing through the path of pins x14y5, x15y4, x14y3, x15y2, x14y1, x15y10, x14y9, x15y8, and x14y7. The first elastic member 5 forms the support post by twisting each other in the section between the pins x14y7 and the pins x15y6. Subsequently, the first elastic member 5 is banded while passing through the paths of the pins x17y4, x15y2, x17y10, x15y8, x17y6, x15y4, x17y2, x15y10, x17y8, x15y6, and x18y3. The first elastic members 5 are fixed by twisting each other in the section formed by the pins x15y6 and x17y4.

As shown in FIG. 9, the second elastic member 7 forms peaks and valleys while passing through the paths of pins x16y10, x14y8, x16y6, x14y4, x16y2, x14y10, x16y8, x14y6, x16y4, and x14y2. Banding. And the second elastic member 7 is fixed by twisting each other in the section formed by the pin x14y2 to x16y10. This twist, of course, serves as a kind of support for the stent. The second elastic member 7 is banded while passing through the paths of the pins x16y10, x18y8, x16y6, x18y4, x16y2, x18y10, x16y8, x18y6, x16y4, x18y2, and x16y10. In addition, the second elastic member 7 is firmly coupled by twisting with each other in a section formed by the pins x16y10 through the pins x18y8 to form a support stand. The second laced portion C formed of the second elastic member 7 has the same structure as the first laced portion A formed of a structure in which the peaks and valleys adjacent in the longitudinal direction of the stent are woven.

As shown in FIG. 10, the first elastic member 5 is banded while passing through the paths of the pins x18y3, x17y2, x18y1, x17y10, x18y9, x16y7, x17y8, x18y7, x17y6, x18y5, x17y4, and x18y3. And the elastic member 5 is fixed to each other while being woven by twist in the x17y4, x18y3 section. Of course, even in this case, the mountains formed by the third laced portion C are coupled to and fixed to the bone portions formed by the crossover portion B. This structure is the same as that described above. In addition, the third entangled portion C is a band and the ridges and valleys disposed adjacent to each other in the longitudinal direction of the stent. This structure is the same as the structure formed in the first woven portion (A) described above.

FIG. 11 illustrates an example in which a stent manufactured according to an embodiment of the present invention is installed at an intersection of intrahepatic bile ducts. That is, first, the first stent 11 is installed in the left bile duct. The first stent 11 can be installed by a conventional method using a conventional catheter. Then, the second stent 13 is inserted into the right biliary tract using a catheter while penetrating the body side of the first stent 11 (intersection portion B in the above description). The stent according to the embodiment of the present invention is disposed in a structure in which the elastic members of the crossing portion B intersect with each other, so that another stent can be easily inserted through this portion. At this time, since the first woven portion (A) and the second woven portion (C) has excellent radial expandability, it is possible to maintain the original shape of the treated stent. Therefore, the procedure can be easily performed in the state where the stent is crossed at the intersection of the intrahepatic bile ducts. Of course, these stents can be used not only in the intersecting area of intrahepatic biliary tract but also in the lumen of the human body such as blood vessels.

In addition, the first weaving part (A) and the second weaving part (C) are arranged in the binding portion in which the ridges and valleys are woven in succession along the longitudinal direction of the stent is arranged is excellent in flexibility and expandability of the stent in the longitudinal direction It is excellent and can reduce the size (thickness) of the insertion mechanism.

1 is a view showing a stent to explain an embodiment of the present invention.

2 is a view showing a method of making a stent using a first elastic member to explain an embodiment of the present invention.

3 is a view showing a method of making a stent using a second elastic member to explain an embodiment of the present invention.

4 to 10 are views sequentially showing a method of manufacturing a stent while the first elastic member and the second elastic member shown in FIGS. 2 and 3 are continuously wound.

11 is a view showing an example of a state of use of the stent manufactured by the embodiment of the present invention.

Claims (7)

A first woven portion formed of an elastic member that is bent and ridged with the ridges and forms a cylindrical mesh structure; An intersecting portion of the first weaving portion, the elastic member extending in an intersecting state to form a cylindrical mesh structure; A second woven portion having an elastic member extending from the intersection to be bent while the ridges and valleys are woven together to form a cylindrical mesh structure; Stent comprising a. The method according to claim 1, The first laced portion and the second laced portion The elastic member is formed in a zigzag shape and the ridges and valleys having a cylindrical path repeatedly, the elastic member is wound on each other in the overlapping portion of the path to form a connecting portion, extending from the connecting portion to form a zigzag shape A stent which is repeatedly formed in a cylindrical shape and is woven with the hills or valleys to form other hills and valleys, and the process is repeated to form a cylindrical mesh structure. The method according to claim 1, The stent member is made of one or two or more. The method according to claim 2, The stent is the connection portion is made of twisted elastic member. The method according to claim 1, The stent is disposed between the first and second weaves. The method according to claim 1, The intersection is Cylindrical mesh having a structure formed on the side of the first woven portion and interwoven with the first woven portion, the woven portion on the second woven portion, and woven with the second woven portion, wherein the elastic member intersects therebetween. Stent made of structure. The method according to claim 1, The first laced portion and the second laced portion A stent, characterized in that parts intersected with each other are continuously arranged along the longitudinal direction.

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