KR102428729B1 - Stent and method of manufacturing the stent - Google Patents

Abstract

A stent and a method for manufacturing the same are disclosed. The stent according to an embodiment has a plurality of intersections in the circumferential direction and the longitudinal direction, respectively, as a wire stent manufactured by woven each of the first wire and the second wire, the intersection of the first wire and the second wire The portions are alternately arranged in each of the circumferential direction and the longitudinal direction, and the intersection portion of the first wire and the intersection portion of the second wire consists of a combination of a hook-shaped hook intersection and a cross-shaped cross intersection, respectively, and The cross intersection of the first wire and the cross intersection of the second wire are arranged in a double spiral shape in the longitudinal direction.

Description

Stent and method of manufacturing the same

The present invention relates to a medical device, and more particularly, to a stent and a method for manufacturing the same.

A stent is a generic term for a medical device inserted into the human body to prevent further progression of a stenosis site and facilitate the flow of substances in the body through diameter expansion of various organs in the human body. A stent is a medical device that can minimize the patient's pain, speed recovery, and obtain immediate medical effects because it is operated into the lumen of the human body through minimally invasive interventional medical technology without surgical operation.

Stents can be divided into cardiovascular, cerebrovascular, general vascular, gastroenterological, respiratory, and urology according to their use. A polymer material or a metal material is mainly used as the main material of the stent, and in the latter case, a wire or tube-shaped material is mainly used as the main material. In the case of a stent whose main material is a wire (hereinafter referred to as a 'wire stent'), it is manufactured to limit the cell shape by weaving one or a plurality of wires in a predetermined method, mainly used for nonvascular systems with a diameter of about 5 mm or more do. On the other hand, in the case of a stent using a tube-shaped material as a main material, it is manufactured to form cells of a predetermined shape using laser cutting, and is mainly used for vascular systems with a diameter of 5 mm or less. Such a stent must be manufactured to have an appropriate size, structure, characteristics, etc. in consideration of the size, characteristics, environment, etc. of the lumen of various organs to be installed.

The wire stent may have various structures and characteristics depending on the shape or size of the cell defined by the intersecting wires as well as the method in which the wires are woven. More specifically, each wire constituting the wire stent may be woven in any one of two ways at the intersection, one is the way the wire is bent and woven at the intersection (hereinafter, 'hook (hook) form') '), and the other is a method in which the wire passes diagonally without being bent at the intersection (hereinafter, referred to as a 'cross shape'). And wire stents are typically made in a manner in which a hook shape and/or a cross shape are disposed in any manner or are disposed in a predetermined pattern along a longitudinal direction or a circumferential direction. For example, in Patent Publication No. 10-0457629, "Method for manufacturing variable state maintenance type expansion mechanism using shape memory alloy and expansion mechanism manufactured thereby" (Patent Document 1), the hook shape in the circumferential direction at the intersection A single form of any one of the and cross form is arranged, but a stent of a configuration in which a hook form and a ring form are intersected in the longitudinal direction is disclosed.

In the case of a non-vascular stent that is operated for expansion of a stenotic site, it is installed in a desired body part in a longitudinally compressed state, and after installation, the original length must be restored. In addition, even after being installed in the lumen of the body, during contraction/relaxation of the body part (eg, digestive system, etc.), it is compressed/expanded in the longitudinal direction and/or in the central direction, but the original state must be restored thereafter. To this end, the stent needs to provide sufficient stress or repulsive force in the longitudinal direction and/or the central direction, otherwise folding or deviation from the installation position occurs. In particular, when the force in the middle direction from both ends of the stent is applied to be deflected in one direction, the stent that does not have sufficient stress or repulsive force is damaged on one side and thus more difficult to restore to its original state.

In addition, the stent may be bent into a predetermined curved shape according to the shape of the body part (lumen) to be installed. In this case, even if the stent is bent, there should be no contact or twisting between adjacent wires. If contact or twist occurs between the bent wires, the fatigue applied to the wire in the corresponding portion is accumulated relatively quickly, thereby shortening the life of the stent or causing damage to the installed body part.

Korean Patent Registration No. 10-0457629 Korean Patent Publication No. 10-2017-0065855

One problem to be solved by the present invention is a stent capable of providing sufficient stress or repulsion force even if a force is applied in the middle direction from both ends of the stent during or after the procedure for installation of the stent is completed and the stent and its manufacture to provide a way

Another problem to be solved by the present invention is to provide a stent that can be easily restored to its original state and a method for manufacturing the same, even when the force applied to both ends of the stent in the middle direction is twisted in either direction .

Another problem to be solved by the present invention is to provide a stent and a method for manufacturing the same in which durability is minimized even when bent to a predetermined shape.

One embodiment of the present invention for solving the above-mentioned problems, as a wire stent manufactured by woven each of the first wire and the second wire, so as to have a plurality of intersections in the circumferential direction and the longitudinal direction, respectively, the intersection of the first wire The intersection of the part and the second wire is alternately arranged in each of the circumferential direction and the longitudinal direction, and the intersection of the first wire and the second wire is respectively a hook-shaped hook intersection and a cross-shaped cross. It consists of a combination of intersections, and the cross intersection of the first wire and the cross intersection of the second wire are arranged in a double spiral shape in the longitudinal direction.

According to one aspect of the embodiment, among the plurality of intersections in the circumferential direction, one cross intersection of the first wire and one cross intersection of the second wire may be included. In this case, the cross intersection of the first wire and the cross intersection of the second wire may be included in each of the plurality of intersection portions in the circumferential direction in the longitudinal direction. In addition, one cross intersection of the first wire and one cross intersection of the second wire may be disposed at positions opposite to each other with respect to the center of the circumference.

Another embodiment of the present invention for solving the above-described problems, using a jig for manufacturing a stent having a fixing pin disposed spaced apart from each other at predetermined intervals in the circumferential direction and the longitudinal direction on the circumferential surface of a cylindrical shape, the first A method of manufacturing a stent so that a cross section is formed at a position corresponding to the fixing pin by bending or passing the wire and the second wire respectively at the fixing pin, wherein the intersection of the first wire and the second wire Crossing portions are alternately arranged in each of the circumferential direction and the longitudinal direction, and the intersection portion of the first wire and the intersection portion of the second wire pass from the fixing pin and the hook intersection formed by weaving to bend at the fixing pin, respectively. It is made of a combination of cross intersections made by weaving so that the first wire and the second wire are respectively arranged in a double helical shape in the longitudinal direction. weave

According to the embodiment of the present invention described above, since the hook intersection occupies a larger proportion than the cross intersection, even when an external force is applied by movement at the installation site during installation or after installation, the stent can be well restored to its original shape. have. In particular, since the cross intersections are arranged in a spiral structure between the hook intersections, the stent can exert sufficient restoring force regardless of the position or direction in which the external force is applied. In addition, since the stent has sufficient structural flexibility as a whole, it can be installed so that friction does not occur between the wires, regardless of the shape of the installation site.

And since the cross intersection of the first wire and the cross intersection of the second wire are arranged to be symmetrical with each other with respect to the central axis of the cylindrical stent, even if the force applied in the longitudinal direction at the time of installation of the stent is deflected in either direction, It is not distorted in one direction and can be restored to its original shape that is symmetrical left and right.

In addition, since the cross intersections adjacent to each other of each wire are spaced apart at least three rows apart, deformation with respect to an external force acting in the central axis direction is minimized, thereby exhibiting sufficient restoring force.

1a and 1b are photographs showing an example of a cylindrical stent according to an embodiment of the present invention, respectively. FIG. 1a is a state in which the stent is inserted into a cylindrical white paper, and FIG. 1b is a state in which the white paper is removed.
Figure 1c is an exploded view of the stent of Figure 1b.
Figures 2a to 2h is a view sequentially showing an example of a method of manufacturing the stent of Figure 1c by weaving two wires in a predetermined manner on the developed view of the jig for manufacturing a cylindrical stent.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Terms and words used in this specification are terms selected in consideration of functions in the embodiments, and the meaning of the terms may vary according to the intention or custom of the invention. Therefore, the terms used in the following examples, when specifically defined in the present specification, follow the definition, and when there is no specific definition, it should be interpreted as a meaning generally recognized by those skilled in the art.

1a and 1b are photographs showing an example of a cylindrical stent according to an embodiment of the present invention, respectively. FIG. 1a is a state in which the stent is inserted into a cylindrical white paper, and FIG. 1b is a state in which the white paper is removed. And Figure 1c is an exploded view of the stent of Figure 1b.

The stents shown in FIGS. 1A to 1C are preferably non-vascular stents used in the digestive system of the human body, but are not limited thereto. And in Figures 1a to 1c, although the stent is shown to have a cylindrical shape as a whole, the present embodiment is not limited thereto, and only a portion of the stent may include a cylindrical shape. For example, the cylindrical stent shown in FIGS. 1A to 1C may constitute a part (eg, a central portion) of the protruding stent in which at least one end of both ends has a larger diameter than the central portion.

Referring to FIGS. 1A to 1C , the stent 100 is composed of two wires of a first wire 110 and a second wire 120 . And the first wire 110 forms a cylindrical shape by forming a plurality of intersections (H1, C1) by woven while extending in the diagonal direction, that is, in the middle direction of the length (L) direction and the circumferential (W) direction, the second wire (120) also extends in the diagonal direction and vice versa, forming a plurality of intersections (H2, C2) to form a cylindrical shape.

As used herein, the 'intersecting portion (H1, H2, C1, C2)' refers to a point at which one wire, that is, the first wire 110 is bent or intersected in opposite directions (eg, up and down). Points (H2, C2) at which (H1, C1) or the second wire 120 are bent or intersected in opposite directions to each other. Therefore, in FIG. 1B , the point at which different wires, that is, the first wire 110 and the second wire 120 cross each other in a diagonal direction (eg, a point marked with X), is the 'intersection ( H1, H2, C1, C2)' is not applicable. A point at which the first wire 110 and the second wire 120 intersect is simply crossed by different wires and is not structurally related to each other.

And in Figures 1a to 1c, there are 14 intersections (a1 ~ a14) in the circumferential (W) direction, 21 (b1 ~ b21) intersections (H1, H2, C1, C2) in the length (L) direction A stent 100 with However, the number of intersections in each of the circumferential (W) direction and the length (L) direction is exemplary, and each of the circumferential (W) direction and the length (L) direction according to the size of the stent 100, that is, the diameter or length, etc. The number of intersections may vary.

According to this embodiment, the intersections (H1, C1) of the first wire 110 and the intersections (H2, C2) of the second wire 120 are alternately arranged in the circumferential (W) direction. They are also alternately arranged in the length (L) direction. More specifically, when viewed in the circumferential (W) direction, in row b1, the intersection points b1 and a1 of the a1 column are the intersection points H2 of the second wire 120, and the intersection points b1, a2 of the a2 column. is the intersection H1 of the first wire 110, and the intersection points b1 and a3 of column a3 are intersections H1, C1, H2 of the second wire 120 in the order of intersection H2, etc. , C2) the types of wires that make up are alternated. This is also true for each of the lines b2 to b21. And when viewed in the length (L) direction, in column a1, the intersection points b1 and a1 of the row b1 are the intersection points H2 of the second wire 120, and the intersection points b2, a1 of the row b2 are It is the intersection H1 of the first wire 110, and the intersection points b3 and a1 of row b3 are also intersections H1, C1, H2 in the order of the intersection H2 of the second wire 120, etc. , C2) the types of wires that make up are alternated. This is also true for each of columns a2 to a14.

And the intersection of the first wire 110 consists of a combination of a hook-shaped intersection, that is, a hook intersection (H1) and a cross-shaped intersection, that is, a cross intersection (C1). And the intersection of the second wire 120 is also made of a combination of the hook intersection (H2) and the cross intersection (C2). That is, the intersection of the first wire 110 and the intersection of the second wire 120 consists only of hook intersections H1 and H2 and cross intersections C1 and C2, respectively, and other types of intersections Wealth is not included at all.

In this case, the intersection of the first wire 110 and the intersection of the second wire 120 includes hook intersections H1 and H2 and cross intersections C1 and C2, respectively, in a predetermined ratio. The mixing ratio between the hook intersection H1 and the cross intersection C1 of the first wire 110 is the mixing ratio between the hook intersection H2 and the cross intersection C2 of the second wire 120 and same.

In addition, the cross intersection (C1) of the first wire 110 and the cross intersection (C2) of the second wire 120, when viewed in the length (L) direction of the stent 100, arranged in a double helix shape has been That is, in the cylindrical stent 100 , the cross intersection C1 of the first wire 110 is arranged in a spiral shape between the hook intersection portions H1 , and the cross of the second wire 120 . The crossing portion C2 is arranged in a spiral shape between the hook intersection portions H2 while maintaining a constant distance from the spiral by the cross intersection portion C1 of the first wire 110 . However, although the cross intersection portions C1 and C2 are illustrated as forming a spiral shape in the lower right direction in FIG. 1B , the cross intersection portions C1 and C2 may be arranged to form a spiral shape in the upper right direction.

More specifically, in the length (L) direction of the stent 100, in all rows (b2 to b20) except for the shortest row (b1, b21), the cross intersection (C1) of the first wire (110), respectively There is one by one, and one cross intersection C2 of the second wire 120 is also present one by one. All others are hook intersections H1 and H2 of the first wire 110 or the second wire 120 . Therefore, in the illustrated embodiment, there are 14 cross intersections C1 of the first wire 110 and 14 cross intersections C2 of the second wire 120 in each row b2 to b20. Six hook intersections H1 of the first wire 110 and six hook intersections H2 of the second wire 120 are present, respectively.

At this time, in the same row (b2 to b20), the interval between the cross intersection C1 of the first wire 110 and the cross intersection C2 of the second wire 120 is 7 columns, that is, the circumference (W) 1/2 of the total number of intersections of directions. According to this, when the stent 110 is cylindrical as shown in FIG. 1A , the cross intersection C1 of the first wire 110 and the cross intersection C2 of the second wire 120 are circumferential is positioned opposite to the center of the Accordingly, the spiral shape by the cross intersection C1 of the first wire 110 and the spiral shape by the cross intersection C2 of the second wire 120 are mutually exclusive with respect to the central axis of the cylindrical stent 100 . They are arranged so that they are symmetrical.

And the cross intersection C1 of the first wire 110 present in each row (b2 ~ b20) is circulated while being spaced apart by a predetermined column interval (three column intervals in FIG. 1B) along the length (L) direction ( That is, the column in which the cross intersection C1 exists is in the order of a3, a6, a9, a12, a1, a4, a7, a10, a13, a2, a5, a8, a11, a14, a3... cycled). This also applies to the cross intersection C2 of the second wire 120 present in each row b2 to b20.

According to the configuration of the stent 100 according to the embodiment of the present invention, the hook intersection portions (H1, H2) having relatively high stress with respect to the external force in the length (L) direction or the center direction of the circle have relatively low stress. It occupies a larger proportion than the cross intersections (C1, C2). Therefore, even when an external force is applied by movement at the installation site during or after the installation of the stent 100 , the stent 100 can be well restored to its original shape.

In particular, according to the embodiment of the present invention, since the cross intersections (C1, C2) are arranged in a spiral structure between the hook intersections (H1, H2), the cross intersections (C1, C2) are cylindrical stents ( 100) It is uniformly arranged in the length (L) direction as well as the circumferential (W) direction throughout. Therefore, the stent 100 can exhibit sufficient restoring force regardless of the position or direction to which the external force is applied. In addition, since the stent 100 has sufficient structural flexibility as a whole, regardless of the shape of the installation site (eg, bent position or degree when the lumen of the installation site is curved), between the wires 110 and 120 It can be installed so that friction does not occur.

And since the cross intersection (C1) of the first wire 110 and the cross intersection (C2) of the second wire 120 are arranged to be symmetrical with each other with respect to the central axis of the cylindrical stent 100, the stent ( Even if the force applied in the longitudinal direction (X) at the time of installation of 100) is deflected in any one direction, the stent 100 restored after being installed in the body part is not twisted in one direction and is well restored to its original shape that is symmetrical left and right can be

In addition, since the cross-intersections C1 and C2 adjacent to each other of the wires 110 and 120 are spaced apart at least three rows apart, the adjacent cross-sections C1 and C2 are not directly connected to each other, so the length L ) direction, deformation is minimized with respect to an external force acting in the central axis direction, so that sufficient restoring force can be exhibited.

Next, a method for manufacturing a stent according to an embodiment of the present invention will be described.

A stent according to an embodiment of the present invention, for example, the stent 100 shown in FIGS. 1A to 1C is a stent having a fixing pin disposed spaced apart from each other at predetermined intervals in the circumferential direction and the longitudinal direction on the circumferential surface of a cylindrical shape. It can be made using a manufacturing jig.

The stent 100 bends the first wire 110 in a predetermined manner in each of the fixing pins (ie, 1/2 of the total fixing pins) that are not adjacent to each other in the length (L) direction and the circumferential (W) direction. Or weave to pass, and also the second wire 120, the first wire 110 in each of the remaining 1/2 of the fixing pins not woven may also be made by bending or weaving in a predetermined manner. According to this, at positions corresponding to each of the fixing pins of the jig, the intersections H1 and C1 of the first wire 110 and the intersections H2 and C2 of the second wire 120 are made. According to the stent manufacturing method according to this embodiment, the manufactured stent 100 is the intersection (H1, C1) of the first wire 110 and the intersection (H2, C2) of the second wire 120 of the following satisfy the condition

First, the stent 100 manufactured using the manufacturing method according to the embodiment of the present invention, the intersection portion (H1, C1) of the first wire 110 and the intersection portion 120 of the second wire (120) They are alternately arranged in each of the circumferential (W) direction and the length (L) direction. And the intersection of the first wire 110 and the intersection of the second wire 120 are hook intersections (H1, H2) made by weaving to bend at the fixing pins, respectively, and cross intersections made by weaving to pass from the fixing pins ( It consists of a combination of C1 and C2, so that the cross intersection C1 of the first wire 110 and the cross intersection C2 of the second wire 120 are arranged in a double helical shape in the length (L) direction. The first wire 110 and the second wire 120 are made by weaving each of the fixing pins.

As long as the above conditions are satisfied, there is no particular limitation on the method of weaving each of the first wire 110 and the second wire 120 from the fixing pin to manufacture the stent 100 . Hereinafter, an example of a method of weaving each of the first wire 110 and the second wire 120 with a fixing pin will be described with reference to FIGS. 1C and 2A to 2H .

2a to 2h, an example of a method of manufacturing the stent 100 by weaving the two wires (110, 120) in a predetermined manner in the fixing pin of the jig for manufacturing a cylindrical stent is sequentially shown. However, in Figs. 2a to 2h, it is shown as weaving the wires 110 and 120 on a developed view of a jig for manufacturing a cylindrical stent, which is only for convenience of illustration. In addition, in Figures 2b to 2h, so that the characteristics of the step are more clearly revealed, the wires 110 and 120 woven in the previous step are shown with dotted lines, and the wires 110 and 120 woven in the corresponding step are solid lines. is shown as

And in FIGS. 2A to 2H , the first wire 110 is shown in blue, and the second wire 120 is shown in red. In addition, in each of the first wire 110 and the second wire 120, the thickness of the wire forming the cross intersections C1 and C2 is shown to be thicker than the wire forming the hook intersections H1 and H2, This is only for clearly showing the arrangement of the cross intersections C1 and C2.

Referring to Figures 1c and 2a, an arbitrary point, for example, a fixing pin a5b2 as a starting point (S1) to start weaving the first wire (110). Instead of the first wire 110, as shown in FIG. 2e, the second wire 120 may be first weaved. And the starting point (S1) of the first wire 110 is not limited to the fixing pin a5b2, any of the intersections (H1, C1) of the first wire 110 in the completed stent (100, see FIG. 1b) A point of may be a starting point of the first wire 110 . However, when the starting point S1 of the first wire 110 is both ends of the stent 100 , that is, columns b1 and b21 , the end of the first wire 110 is exposed to the outside of both ends of the stent 100 . Because it can be, it is better not to be the starting point of the first wire (110).

The first wire 110 starting from the fixing pin a5b2 is deployed in an arbitrary diagonal direction. In FIG. 2A , the first wire 110 is illustrated as being deployed in the lower right direction, that is, the fixing pin a6b3 direction, but this is exemplary. For example, the first wire 110 may be deployed in the lower left direction, that is, the fixing pin a4b3 direction.

And the first wire 110, which is developed in the lower right direction, continues in the lower right direction, that is, in the direction of the fixing pin a7b4 so as to form the cross intersection C1 in the next fixing pin, that is, the fixing pin a6b3. That is, the first wire 110 passes through the fixing pin a6b3 as it is. However, the present embodiment is not limited thereto, and the first wire 110 deployed in the lower right direction may be deployed in the upper right direction, that is, the fixing pin a7b2 direction to form a hook intersection at the fixing pin a6b3 (in this case, The cross intersection C1 may have a spiral shape in the lower left direction). Hereinafter, only the former case will be described.

Subsequently, the first wire 110 deployed to the fixing pin a7b4 is deployed in the upper right direction, that is, the fixing pin a8b3 to form a hook intersection (H1) in the corresponding fixing pin. That is, the first wire 110 is bent at the fixing pin a7b4. And the first wire 110 deployed to the fixing pin a8b3 is deployed in the lower right direction, that is, the fixing pin a9b4 to form a hook intersection (H1) in the fixing pin. That is, the first wire 110 is bent at the fixing pin a8b3.

In this way, after developing in the lower right direction from the starting point (S1), the first fixing pin passes as it is to form the cross intersection (C1), and then, the second fixing pin and the second fixing pin to form two hook intersections (H1) The pattern of weaving the first wire 110 in such a way that each of the third fixing pins is bent is repeated continuously thereafter. More specifically, the first wire 110 passes through the fixing pin a9b4 in the lower right direction in the fixing pin a8b3, and then is bent at the fixing pin a10b5 in the lower right direction, and then is also bent in the fixing pin a11b4 in the upper right direction. Subsequently, the first wire 110 passes the fixing pin a12b5 in the lower right direction from the fixing pin a11b4, and then is bent at the fixing pin a13b6 in the lower right direction, and then is also bent in the fixing pin a14b5 in the upper right direction. The deployment method of the first wire 110 is repeated until the first wire 110 is deployed on the fixing pin a3b20.

Continuing to refer to Figures 1c and 2b, the first wire 110, after being bent at the fixing pin a3b20, which is the end point in the step shown in Figure 2a, is continuously bent until deployed on the fixing pin a14b21 do. More specifically, the first wire 110 is continuously bent at each fixing pin, starting from the fixing pin a3b20 and passing through the fixing pins a4b21, a5b20, a6b21, a7b20, a8b21, a9b20, a10b21, a11b20, a12b21 and a13b20. It expands in the lower right or upper right direction, and reaches the fixing pin a14b21.

Continuing to refer to Figures 1c and 2c, the first wire 110, the end point in the step shown in Figure 2b, is developed in the upper right direction at the fixing pin a14b21 to cross cross at the next fixing pin, that is, the fixing pin a1b20. It continues to develop in the upper right direction, that is, in the direction of the fixing pin a2b19 so as to form the portion C1. That is, the first wire 110 passes through the fixing pin a1b20 as it is. And the first wire 110 deployed to the fixing pin a2b19 is deployed in the lower right direction, that is, the fixing pin a3b20 to form a hook intersection (H1) in the fixing pin. That is, the first wire 110 is bent at the fixing pin a2b19. After that, it is continuously bent until it is deployed on the fixing pin a11b20. More specifically, the first wire 110 is continuously bent at each fixing pin so as to start from the fixing pin a2b19 and pass through the fixing pins a3b20, a4b19, a5b20, a6b19, a7b20, a8b19, a9b20, and a10b19 in the lower right or upper right direction. , and reaches the fixing pin a11b20.

In this way, after expanding in the upper right direction from the fixing pin a14b21, the first fixing pin passes as it is to form a cross intersection (C1), and then the second fixing pin or row to form 10 hook intersections (H1). The pattern of weaving the first wire 110 in such a way that each of the first fixing pins is bent is repeated continuously thereafter. The deployment method of the first wire 110 is repeated until the first wire 110 is deployed on the fixing pin a4b1.

Continuing to refer to Figures 1c and 2d, the first wire 110, after being bent at the fixing pin a4b1, which is the end point in the step shown in Figure 2c, is continuously bent until deployed on the fixing pin a2b1 do. More specifically, the first wire 110 starts from the fixing pins a4b1 and continuously at each of the fixing pins a5b2, a6b1, a7b2, a8b1, a9b2, a10b1, a11b2, a12b1, a13b2, a14b1 and a1b2. It is bent and deployed in the lower right or upper right direction, and reaches the fixing pin a2b1.

The first wire 110 continuously developed in the lower right direction from the fixing pin a2b1 continues to the lower right direction, that is, the fixing pin a4b3 direction to form the cross intersection C1 in the next fixing pin, that is, the fixing pin a3b2. That is, the first wire 110 passes through the fixing pin a3b2 as it is. And the first wire 110 deployed to the fixing pin a4b3 is deployed in the upper right direction, that is, the fixing pin a5b2 to form a hook intersection (H1) in the fixing pin. That is, the first wire 110 is bent at the fixing pin a4b3. As a result, the first wire 110 is returned to the fixing pin a5b2, which is the starting point (S1), so that the weaving process for the first wire 110 is finished.

Next, by using a jig for manufacturing a stent of a cylindrical shape in which weaving of the first wire 110 is completed, weaving for the second wire 120 is started. That is, half of the fixing pins of the stent manufacturing jig has already been used for weaving of the first wire 110 , and weaving of the second wire 120 is performed using the remaining fixing pins.

First, referring to Figures 1c and 2e, an arbitrary point, for example, a fixing pin a12b2 as a starting point (S2) to start weaving the first wire (110). As described above, the weaving process of the second wire 120 may be performed before the weaving process for the first wire 110 as shown in FIGS. 2A to 2D . And the starting point (S2) of the second wire 120 is also not limited to the fixing pin a12b2, any of the intersections (H2, C2) of the second wire 120 in the completed stent (100, see FIG. 1b) A point of may be a starting point of the second wire 120 . However, when the starting point S2 of the second wire 120 is at both ends of the stent 100 , that is, columns b1 and b21, the end of the second wire 120 is exposed to the outside of both ends of the stent 100 . Because it can be, it is better not to be the starting point of the second wire (120).

The second wire 120 starting from the fixing pin a12b2 is deployed in an arbitrary diagonal direction. In FIG. 2E , the first wire 110 is illustrated as being deployed in the lower right direction, that is, the fixing pin a13b3 direction, but this is exemplary. For example, the second wire 120 may be deployed in the lower left direction, that is, the fixing pin a11b3 direction. However, according to this embodiment, the spiral direction of the cross intersection C2 of the second wire 120 is a predetermined interval in the spiral direction of the cross intersection C1 of the first wire 110 (this embodiment). In the circumferential (W) direction, the second wire 120 should be deployed in the upper right or lower right direction from the starting point S2 so that the second wire 120 is spaced apart by 7 column intervals, which is half of the number of fixing pins in the circumferential direction, in the same direction.

And the second wire 120 developed in the lower right direction continues to the lower right direction, that is, in the direction of the fixing pin a14b4, so as to form a cross intersection C2 in the next fixing pin, that is, the fixing pin a13b3. That is, the second wire 120 passes through the fixing pin a13b3 as it is. However, the present embodiment is not limited thereto, and the second wire 120 developed in the lower right direction may be deployed in the upper right direction, that is, the fixing pin a14b2 direction to form a hook intersection at the fixing pin a13b3. Hereinafter, only the former case will be described.

Subsequently, the second wire 120 developed with the fixing pin a14b4 is deployed in the upper right direction, that is, the fixing pin a1b3 to form a hook intersection H2 at the corresponding fixing pin. That is, the second wire 120 is bent at the fixing pin a14b4. And the second wire 120 deployed to the fixing pin a1b3 is deployed in the lower right direction, that is, in the fixing pin a2b4 to form a hook intersection (H2) in the fixing pin. That is, the second wire 120 is bent at the fixing pin a1b3.

In this way, after developing in the lower right direction from the starting point (S2), the first fixing pin passes as it is to form a cross intersection (C2), and then with the second fixing pin to form two hook intersections (H2). The pattern of weaving the second wire 120 in such a way that each of the third fixing pins is bent is repeated continuously thereafter. More specifically, the second wire 120 passes through the fixing pin a2b4 in the lower right direction in the fixing pin a1b3, and then is bent at the fixing pin a3b5 in the lower right direction, and then is also bent in the fixing pin a4b4 in the upper right direction. Subsequently, the second wire 120 passes through the fixing pin a5b5 in the lower right direction from the fixing pin a4b4, and then is bent at the fixing pin a6b6 in the lower right direction, and then is also bent in the fixing pin a7b5 in the upper right direction. The deployment method of the second wire 120 is repeated until the second wire 120 is deployed on the fixing pin a10b20.

Continuing to refer to FIGS. 1C and 2F , the second wire 120 is bent continuously at the fixing pin a10b20, which is the end point in the step shown in FIG. 2E, until deployed on the fixing pin a7b21. do. More specifically, the second wire 120 is continuously bent at each fixing pin, starting from the fixing pin a10b20 and passing through the fixing pins a11b21, a12b20, a13b21, a14b20, a1b21, a2b20, a3b21, a4b20, a5b21 and a6b20. It develops in the lower right or upper right direction, and reaches the fixing pin a7b21.

Continuing to refer to FIGS. 1C and 2G , the second wire 120 is developed in the upper right direction at the fixing pin a7b21, which is the end point in the step shown in FIG. 2F, and crosses over at the next fixing pin, that is, the fixing pin a8b20. It continues to develop in the upper right direction, that is, in the direction of the fixing pin a9b19 so as to form the portion C2. That is, the second wire 120 passes through the fixing pin a8b20 as it is. And the second wire 120 developed with the fixing pin a9b19 is deployed in the lower right direction, that is, the fixing pin a10b20 so as to form a hook intersection H2 in the corresponding fixing pin. That is, the second wire 120 is bent at the fixing pin a9b19. After that, it is continuously bent until it is deployed on the fixing pin a4b20. More specifically, the second wire 120 is continuously bent at each fixing pin so as to start from the fixing pin a9b19 and pass through the fixing pins a10b20, a11b19, a12b20, a13b19, a14b20, a1b19, a2b20, and a3b19 in the lower right or upper right direction. , and reaches the fixing pin a4b20.

In this way, after expanding in the upper right direction from the fixing pin a7b21, the first fixing pin passes as it is to form a cross intersection (C2), and then the second fixing pin or row to form 10 hook intersections (H2). The pattern of weaving the second wire 120 in such a way that each of the first fixing pins is bent is repeated continuously thereafter. The deployment method of the second wire 120 is repeated until the second wire 120 is deployed to the fixing pin a11b1.

Continuing to refer to FIGS. 1C and 2H , the second wire 120 is bent continuously at the fixing pin a11b1, which is the end point in the step shown in FIG. 2G, until it is deployed on the fixing pin a9b1. do. More specifically, the second wire 120 starts from the fixing pins a11b1 and continuously at each of the fixing pins a12b2, a13b1, a14b2, a1b1, a2b2, a3b1, a4b2, a5b1, a6b2, a7b1 and a8b2. It is bent and deployed in the lower-right or upper-right direction to reach the fixing pin a9b1.

The second wire 120 continuously developed in the lower right direction from the fixing pin a9b1 continues in the lower right direction, that is, the fixing pin a11b3 direction to form the cross intersection C2 at the next fixing pin, that is, the fixing pin a10b2. That is, the second wire 120 passes through the fixing pin a10b2 as it is. And the second wire 120 deployed to the fixing pin a11b3 is deployed in the upper right direction, that is, the fixing pin a12b2 to form a hook intersection (H2) in the fixing pin. That is, the second wire 120 is bent at the fixing pin a11b3. As a result, the second wire 120 is returned to the fixing pin a12b2, which is the starting point (S2), so that the weaving process for the second wire 120 is finished, and the weaving structure of the manufactured stat 100 is shown in Fig. 1b as shown in

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications may be made by those skilled in the art within the scope of the technical spirit of the present invention. It is possible.

100: stent
110: first wire
120: second wire
H1, H2: Hook intersection
C1, C2: cross intersection
S1, S2: starting point
P: fixing pin

Claims (5)

As a wire stent manufactured by woven each of the first wire and the second wire, respectively, to have a plurality of intersections in the circumferential direction and the longitudinal direction,
The intersection of the first wire and the intersection of the second wire are alternately arranged in each of the circumferential direction and the longitudinal direction,
The intersection of the first wire and the intersection of the second wire consists of a combination of a hook-shaped hook intersection and a cross-shaped cross intersection, respectively.
The cross intersection of the first wire and the cross intersection of the second wire are arranged in a double spiral shape in the longitudinal direction,
Among the plurality of intersections in the circumferential direction, the cross intersection of the first wire and the cross intersection of the second wire each include one stent.
delete The method of claim 1,
The cross intersection of the first wire and the cross intersection of the second wire are included in each of the plurality of intersections in the circumferential direction in the longitudinal direction, respectively.
4. The method of claim 1 or 3,
A stent, characterized in that the cross-intersection of the first wire and the cross-section of the second wire are disposed at positions opposite to each other with respect to the center of the circumference.
Using a jig for manufacturing a stent having a fixing pin spaced apart from each other at predetermined intervals in the circumferential direction and the longitudinal direction on the circumferential surface of a cylindrical shape, the first wire and the second wire are bent or passed from the fixing pin, respectively A method of manufacturing a stent so that an intersection is formed at a position corresponding to the fixing pin by weaving it so as to
The intersection of the first wire and the intersection of the second wire are alternately arranged in each of the circumferential direction and the longitudinal direction,
The intersection of the first wire and the intersection of the second wire consists of a combination of a hook intersection made by weaving to bend at the fixing pin, and a cross intersection made by weaving to pass from the fixing pin, respectively,
The cross intersection portion of the first wire and the cross intersection portion of the second wire are arranged in a double spiral shape in the longitudinal direction, and among the plurality of intersection portions in the circumferential direction, the cross intersection portion of the first wire and the second wire cross A method of manufacturing a stent, characterized in that each of the first wire and the second wire are intertwined so that one cross section of the two wires is included.

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