KR20020072698A - Extended intravascular stent configured by combining multi stent lines - Google Patents

Abstract

According to the present invention, a stent is manufactured by a combination of simple structures of two filaments, so that the manufacturing process is simple, and a large amount of products can be produced in a short time, and the thickness of the two filaments is different from each other, The present invention relates to a lumen-expansion stent composed of a plurality of combinations capable of finely adjusting inflation force to be suitable for lesions in a human body, and the structure of which has a zigzag shape at predetermined intervals from one end point of the reference circumference to the other end thereof. A first filament forming a mesh structure by reciprocating and forming a plurality of unit members and a predetermined position different from the reference point as one reference point, and zigzag at regular intervals to the other end to form a plurality of unit members. A plurality of combinations composed of second filaments forming a mesh structure It is generated on the luminal stent for expansion.

Description

Extension combination stent consisting of multiple combinations {EXTENDED INTRAVASCULAR STENT CONFIGURED BY COMBINING MULTI STENT LINES}

The present invention relates to a lumen expansion stent composed of a plurality of combinations, in particular, by manufacturing a stent with a simple structure combination of two filaments, the manufacturing process is simple, and a large amount of products can be produced in a short time, and 2 By varying the thickness of the dog filament or by varying the knot between the filaments, and relates to a lumen expansion stent composed of a plurality of combinations that can finely adjust the expansion force to suit the lesions in the human body.

In general, diseases caused in the human body can cause narrowing of the lumens in the human body, leading to reduced function or, in severe cases, no function. For example, the esophagus, blood vessels, bronchi, biliary tract and urethra are cancer or inflammation. Stricture by

As the lumen is confined as described above, food, blood, or bile cannot flow smoothly. Therefore, the constricted lumen must be expanded to maintain the passage. In this case, the stented passage can be expanded by inserting the stent into the lumen.

In general, the stent forms a cylindrical structure, and has an elastic force so that it can be contracted by applying an external force. When the external force is removed, the stent expands itself in a circular shape.

Referring to the prior art stent in FIG. 1, the stent 100 is in the form of a tube that can be shrunk and expanded, the wall of the tube form a plurality of spiral filaments 102 cross each other to form a mesh form, the The plurality of spiral filaments 102 consists of one elongated filament 102.

The fabrication process is one spiral filament 102 spirally along the tubular wall from a starting point, which is a point on the N-divided circumference, which constitutes one end of the tube form, to a point on the other side, which is N-divided circumference. After proceeding, the spiral is rotated again, passing through the other pin at one end spaced apart from the start pin, and repeating these steps, reciprocating both ends of the tube form in a zigzag form, crossing each other at the same time and meshing on the wall ) Into a plurality of spiral filaments 102. That is, one long filament 102 constitutes the entire tube shape.

However, the above-described prior art stent has to go through several steps repeatedly to form a cylindrical structure with one filament, and thus, the manufacturing process is complicated and productivity may be reduced.

Another problem is that the stent must be manufactured using a single filament of a single thickness, and thus the expansion force of the stent does not exhibit various expansion forces due to the limited elastic force of the material constituting the filament and the limited range of thickness specifications.

The present invention has been made to solve the above problems, by producing a stent with a combination of a simple structure of two filaments, the manufacturing process is simple to produce a large amount of products in a short time, and the thickness of the two filaments By differently configuring or by varying the knot between the filaments, to provide a lumen expansion stent consisting of a plurality of combinations to finely adjust the expansion force to suit the lesions in the human body.

In order to realize this, the present invention forms a zigzag shape at a predetermined interval from one end reference point to the other end of the reference circumferential surface and forms a mesh structure by reciprocating to form a mesh structure, and a predetermined position different from the reference point. To provide a stent for expanding the lumen of a plurality of combinations, characterized in that it comprises a second filament that forms a mesh structure by forming a mesh structure by forming a plurality of unit members by zigzag at a predetermined interval from one end to a reference point at one end. will be.

1 is a perspective view showing a conventional technology.

Figure 2 is a perspective view of the present invention.

Figure 3 is a front view showing the unfolded state of the first step manufacturing process of the present invention.

Figure 4 is a front view showing the unfolded state of the second step manufacturing process of the present invention.

5 is a front view showing an expanded state of the completed state of the present invention.

6 and 7 are perspective views showing a state in which both ends of the stent of the present invention is opened.

Figure 8 (a), (b), (c) is a front view showing the knotting method of the present invention.

<Explanation of symbols for the main parts of the drawings>

2: stent 4: first filament 6: second filament

8,28: 1st reference point 10,30: 1st unit member 12,32: 2nd reference point

14, 34: third reference point 16, 36: second unit member 18, 38: fourth reference point

20, 40: 3rd unit member 22, 44: Valley part 24, 42: Peak part

26: first connecting portion 46: second connecting portion 48, 54: first straight portion

50, 56: second straight portion 52: third straight portion

As shown in FIG. 2, the stent 2 having a cylindrical shape as a whole is composed of a first filament 4 and a second filament 6, and the material of the filament is preferably composed of a shape memory alloy wire. .

As shown in FIG. 3 (Note: 1a, 2a, 3a, .. and 1A, 2A, 3A, .. are the same points in the cylindrical space) The first filament 4 has a first reference point 8 at one end. (1a on the drawing) is repeatedly formed in a zigzag at intervals of one pitch with a starting point, and the first unit member 10 is formed while arriving at the first reference point 8, and at the first reference point 8 The coil is formed in a coil form to the second reference point 12 and the linear unit is extended from here to the third reference point 14 and repeatedly formed again in zigzag to reach the second reference point 12. The coil is formed in a coil form from the second reference point 12 to the third reference point 14 while winding linearly from here to the fourth reference point 18 and repeatedly formed in a zigzag pattern to repeat the third reference point 14. ), The third unit member 20 is formed.

Repeating the above manner to the other end of the stent 2, the stent 2 of the appropriate length is formed primarily, wherein a plurality of valleys 22 and peaks 24 are formed, The first connection part 26 is formed while being wound in a coil form on a plurality of straight lines.

Also, at one end of the stent 2, a first unit member 10 and a second unit member 16, a third unit member 20, a n-th unit member, etc. continuously adjacent thereto are formed. Intersections where the valley portions 22 of the first unit member 10 and the peak portions 24 of the second unit member 16 meet are connected in a twisted manner in a single coil manner, and the second unit member The valley portions 22 of 16 and the peak portions 24 of the third unit member 20 are continuously connected in a twisted manner in the same manner. (Note: The valley portion 22 and the peak portion ( 24) corresponds to the first, second, third, and whole unit members.)

On the other hand, as described above, in a state in which the cylindrical shape is primarily composed of the first filament 4, the second filament 6 is secondarily constructed. Referring to FIG. 4, the first reference point 28 (1f in the drawing) is described above. The first unit member 30 is repeatedly formed in zigzag at intervals of two pitches with the starting point opposite to the first reference point 8 of the first filament 4 at 180 degrees. The coil is formed and wound in a coil form from the first reference point 28 to the second reference point 32, and then linearly arrives from here to the third reference point 34, and is repeatedly formed in a zigzag pattern to repeat the second reference point 32. The second unit member 36 is formed as it arrives at, and is wound in a coil form from the second reference point 32 to the third reference point 34, and then linearly extends from here to the fourth reference point 38. Repeatedly formed in zigzag to arrive at the third reference point 34 The third unit member 40 is formed.

The stent 2 is formed by repeating the above-described method, wherein a plurality of valleys 44 and peaks 42 are formed, and the second filament 6 is coiled in a plurality of straight portions. The second connector 46 is formed while being wound.

The intersection of the valleys 44 and the peaks 42 for each of the first, second, third, and n unit members 30, 36, 40,... Is shown in FIG. 8A. As shown in Fig. 8 (b) may be connected to cross a single coil method alternately, as shown in (b) of FIG. 8 may also be connected in a plurality of coils crossed alternately two or more times, as shown in (c) of FIG. As shown, a coating connection method of coating a coating at the intersection of the valley portion 44 and the peak portion 42 may be used. In addition, where the stent (2) is divided into parts by a portion requiring a high expansion force can be used a plural coil method, a place requiring a low expansion force can be used a single coil method, the single coil method and the plural coil method Alternates can be used in alternating proportions at each intersection.

Meanwhile, as a preferred embodiment, in order to prevent movement when the stent 2 is inserted into the lumen, as shown in FIG. 6, the diameter of the zigzag portion formed at both ends of the cylinder is enlarged toward the end. It may be configured in the shape of a trumpet, and may be configured in the shape of a dumbbell that is uniformly enlarged in diameter at both ends as shown in FIG.

In addition, when the stent 2 is inserted into the lumen for a long time by covering the stent 2 with a thin elastic coating member made of polyurethane or silicon, the thrombus of the lumen can be prevented from growing into the stent 2. have.

Referring to the manufacturing process of the present invention configured as described above are as follows.

First, referring to FIG. 3 to describe a one-step manufacturing process formed of the first filament 4, one end of the first filament 4 having an appropriate unit length for making the stent 2 is fixed so as not to move. Then, starting from the first reference point (8) having the 1a pin of the reference circumferential surface is positioned to the second reference point (12) with the 2b pins located at a pitch pitch downward to form a first straight portion 48 And, from the second reference point 12 is located up to 1c pin installed on the reference circumferential surface, located from the 1c pin to the 2d pin installed at a pitch interval from the bottom, and reciprocating in a zigzag shape to the first filament ( When 4) arrives at the first reference point 8, the first unit member 10 is formed. At this time, the peak portion 24 is formed at one end of the reference circumferential surface, the valley portion 22 is formed at the other end, 1a, 2a, 3a, ... and 1A, 2A, 3A, ... It is the same point.

The first filament 4 arriving at the first reference point 8 is wound around the first straight portion 48 provided between the first reference point 8 and the second reference point 12 in a coil form to form a second reference point ( 12), and extends linearly to the third reference point 14 of the 3c pin, which is spaced one pitch downward, to form a second straight portion 50, and upwards from the third reference point 14. Positioned up to the 2d pins spaced by a pitch interval, and intersected with the valley portion 22 formed in the first unit member 10 once, and positioned from the 2d pins to the 3e pins installed on the lower side, and continues in a zigzag shape. The first unit filaments 4 arrive at the second reference point 12 by reciprocating to form a second unit member 16. At this time, the points where the valley portions 22 having the first unit member 10 and the peak portions 24 having the second unit member 16 meet are alternately intersected once.

Subsequently, the first filament 4 arriving at the second reference point 12 winds the second straight portion 50 provided between the second reference point 12 and the third reference point 14 in a coil form. After arriving at the third reference point 14, the linear extension is positioned to the fourth reference point 18 of the 4d pin installed at a lower pitch by one pitch downward to form a third straight portion 52, and the fourth reference point 18. 1c spaced up to the 3e pins spaced apart from each other in the valley portion 22 formed in the second unit member 16 alternately intersected once, and from the 3e pins to the 4f pins installed in the lower position Then, the third unit member 20 is formed by reciprocating in a zigzag shape so that the first filament 4 arrives at the third reference point 14. At this time, the points where the valleys 22 and the peaks 24 meet are connected by crossing each other once.

If the appropriate length is formed by repeating the above process, the first step manufacturing process is finally completed while forming a cylindrical mesh structure.

Meanwhile, referring to FIG. 4, a two-stage manufacturing process formed of the second filament 6 will be described. In the state of the first filament 4 as described above, one end of the second filament 6 having an appropriate unit length will be described. After fixing so as not to move, starting from the first reference point 28, the 1f pin is installed on the reference circumferential surface, and 2 pitch intervals to the lower position to the second reference point 32, which is installed 3h pin, the first straight line ( 54), located from the second reference point 32 to the 1j pin installed on the reference circumferential surface, positioned from the 1j pin to the 3b pin spaced apart by 2 pitches, and the reference circle at the 3b pin. The first unit member 30 is formed by locating up to a 1d pin provided on the main surface, and then reciprocating in a zigzag shape in the same manner so that the second filament 6 arrives at the first reference point 28. At this time, peaks 42 are formed at one end of the reference circumferential surface, and valleys 44 are formed at the other end of the first unit member 30, and 1a, 2a, 3a, .. 1A, 2A, 3A, ... are the same point.

The second filament 6 arriving at the first reference point 28 is wound around the first straight portion 54 provided between the first reference point 28 and the second reference point 32 in the form of a coil. After the second reference point 32 is positioned, the second straight portion 56 is formed by linearly extending the second reference point 34 of the 5j pin installed at a distance of 2 pitches from the bottom to the third reference point ( 34) spaced apart by 2 pitches from the top of the 3b pins, which are intersected with each other once in the valley portion 44 formed on the first unit member 30, and spaced 2 pitches downward from the 3b pins. The second unit member 36 is formed by reciprocating in a zigzag shape in the same manner as the second filament 6 arrives at the second reference point 32. At this time, the points where the valleys 44 and the peaks 42 meet are connected to each other by crossing each other once.

When the above process is repeated to the other end of the stent (2), to form a cylindrical mesh (mesh) structure finally to finish the second step manufacturing process, to the first, second filaments (4, 6) The constructed stent 2 is completed. At this time, the first reference point 8 of the first filament 4 and the first reference point 28 of the second filament 6 are located 180 degrees opposite to each other on the reference circumferential surface, thereby providing one end of the stent 2 Two rows of the first and second connection parts 26 and 46 formed from the other end to the other end are balanced by being located at both sides without being driven to one side.

In the drawings of the present invention, in one embodiment, the circumferential equivalent is composed of ten pins. The circumferential equality may be configured to be an even number of 8 or more and not a multiple of 4. For example, 10,14,18,22, ..to be.

In addition, by controlling the thickness of the first filament 4 and the second filament 6 differently, the expansion force can be finely adjusted.

For example, the thickness of the filament is mainly used 0.12, 0.15, 0.17, 0.2, 0.22, 0.25mm, the first filament is organized to a thickness of 0.2mm and the second filament is organized to a thickness of 0.17mm It is more flexible than the existing stent with only a thickness of 0.2mm, and it can exert higher expansion force than the stent with only a thickness of 0.17mm. It is possible to finely adjust the radial expansion force to suit the

In addition, the expansion force can be adjusted by varying the knotting method at the intersection between the valleys and the peaks during the first and second manufacturing processes, for example, a single coil method or a coating connection method in which a coating is crossed one or more times at the intersection. Alternatively, a plurality of coils may be alternately crossed two or more times, and the single coil and the plurality of coils may be alternately formed at each crossing point, and both ends of the stent may have high expansion force only in the middle of the stent. By using a single coil method and a knot method composed of a plurality of coils in the middle part, it is possible to exert various expansion forces suitable for lesions in the human body. At this time, the plural coil method exhibits the highest expansion force, and the single coil method exhibits the low expansion force.

According to the present invention, a stent is manufactured by a combination of simple structures of two filaments, thereby producing a large amount of products in a short time due to a simple manufacturing process, and varying the thicknesses of the two filaments or varying the knot between filaments. By doing so, there is an effect of finely adjusting the expansion force to suit the lesion in the human body.

Claims (14)

A first filament forming a mesh structure by reciprocating in a zigzag shape at predetermined intervals from one end point of the reference circumferential surface to the other end to form a plurality of unit members; The lumen composed of a plurality of combinations comprising a second filament which forms a mesh structure by forming a mesh structure by reciprocating and forming a zigzag shape at a predetermined interval to one end with a predetermined position different from the reference point as a reference point at one end. Extension stent. The method of claim 1, The lumen expansion stent consisting of a plurality of combinations, characterized in that the thickness of the first filament and the second filament is configured differently. The method according to claim 1 or 2, The stent for expanding lumen of the plurality of combinations of the first and second filaments, wherein the first and second connecting portions formed in a twisted form from one end to the other end are formed at predetermined positions in opposite directions. The method of claim 1, Peaks are formed at one end of the unit members, valleys are formed at the other end, and one side of the stent is configured to form a plurality of combinations characterized in that the straight portion for forming the connection portion stent for luminal expansion. The method of claim 4, wherein The lumen expansion stent consisting of a plurality of combinations, characterized in that configured in a single coil method to cross the intersection of the peak portion and the valley portion between the unit members once. The method of claim 4, wherein At the intersections of the peak portion and the valley portion between the unit members, a plurality of combination lumen expansion stent, characterized in that it consists of a plurality of coils are crossed at least two times. The method of claim 4, wherein At the intersections of the peak portion and the valley portion between the unit members, the single coil method and the plurality of coil methods are configured by combining the luminal extension stent consisting of a plurality of combinations. The method of claim 4, wherein At the intersection of the peak portion and the valley portion between the unit members is a lumen expansion stent consisting of a plurality of combinations, characterized in that it is configured by a coating connection method. The method according to any one of claims 1, 2 and 4 to 8, A stent for expanding lumen of the plural combinations, wherein the zigzag-shaped portions formed at both ends of the stent are configured in a trumpet shape with a diameter extending toward the end. The method of claim 3, wherein A stent for expanding lumen of the plural combinations, wherein the zigzag-shaped portions formed at both ends of the stent are configured in a trumpet shape with a diameter extending toward the end. The method according to any one of claims 1, 2 and 4 to 8, A lumen expansion stent consisting of a plurality of combinations, characterized in that consisting of a dumbbell shape that is uniformly enlarged in diameter at both ends of the stent. The method of claim 3, wherein A lumen expansion stent consisting of a plurality of combinations, characterized in that consisting of a dumbbell shape that is uniformly enlarged in diameter at both ends of the stent. The method according to any one of claims 1, 2 and 4 to 12, The stent for luminal expansion consisting of a plurality of combinations, characterized in that the outer periphery of the stent is composed of a thin elastic coating member made of polyurethane or silicone material. The method of claim 3, wherein The stent for luminal expansion consisting of a plurality of combinations, characterized in that the outer periphery of the stent is composed of a thin elastic coating member made of polyurethane or silicone material.