JP2002224224A - Stent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stent flexible in an axial direction, not contracting in the axial direction at the time of the extension, having large resistance to the contracting force of a blood vessel, capable of uniformly extending a strut and the end parts of which are not curved with a diameter larger than the one of a center part at the time of extension. SOLUTION: This stent is formed in an almost tubular body and is composed of almost wavy constituting elements 2 and 3 expandable in a circumferential direction. A plurality of the almost wavy constituting elements 2 expandable in the circumferential direction are arranged in the almost circumferential direction of the stent without being directly connected to each other, a plurality of the almost wavy constituting elements 3 expandable in the axial direction are arranged in the almost circumferential direction of the stent without being directly connected to each other and they are alternately and cyclically continued in the stent axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates generally to a stent for implantation in a living body.

[0002]

2. Description of the Related Art A stent is used to treat a variety of diseases caused by stenosis or occlusion of a blood vessel or other body lumen, thereby expanding the stenosis or occlusion and maintaining the lumen size. Medical device to be placed there for use, consisting of a single linear metal or coiled stent made of a polymer material, a metal tube cut out by a laser, and a linear member processed by a laser And those made by weaving a plurality of linear metals.

[0003] These can be classified into those that are expanded by a balloon mounted with a stent, and those that expand themselves by removing a member that suppresses expansion from the outside.

[0004] Among them, the stent expanded by the balloon is used by adjusting the expansion pressure according to the state of the tubular tissue to be expanded and the mechanical strength of the stent. In recent years, these stents have been widely used, particularly for angioplasty of the heart and carotid artery.

[0005] Japanese Patent Publication No. 4-6377 describes a stent in which, after being expanded, the components have a continuous diamond shape. This stent has the advantage that the resistance to the force of the blood vessel to contract is very large. However, since the stent lacks flexibility in the axial direction when not expanded, it is very difficult to insert the stent into a bent blood vessel, and there is a possibility that the inside of the blood vessel may be damaged. Further, even after dilatation, there is a problem in that, when transplanted into a bent blood vessel, excessive stimulation is given to the blood vessel and restenosis is promoted because of lack of flexibility in the axial direction. Further, at the time of expansion, the length in the axial direction of the stent is contracted, and there is a problem that it is difficult to expand the entire stenosis of the blood vessel.

Further, Japanese Patent Publication No. 7-24688 discloses a stent in which a wire is deformed in a zigzag shape and the wire is spirally wound into a cylindrical shape. This stent has excellent flexibility in the axial direction, and has excellent insertability into a bent blood vessel. However, there is a problem in that the blood vessel has a very low resistance to the force of contraction, and the blood vessel is easily contracted by the contracting pressure. In addition, when expanding to a target diameter, it is difficult to uniformly expand the struts of the stent, and there is a problem in that a portion that greatly expands even within the same circumference and a portion that does not expand much are likely to be formed. there were.
If such non-uniform expansion is performed, endothelial tissue of the tubular tissue protrudes greatly from the part where the strut is widely opened, which may cause restenosis. In addition, when the uneven expansion is severe, it may not be possible to maintain a perfect circle in cross section. In order to solve this problem, a method of folding a balloon for mounting the stent has been devised, but it is still difficult to expand the balloon sufficiently uniformly. In other methods, attempts have been made to attach a member that can be easily expanded uniformly to the balloon surface, but the profile of the balloon becomes large, making it difficult to deliver the stent to the target site. Has become a problem.

[0007] In addition, most stents that are expanded by balloons have a problem that both ends of the stent are warped to a larger diameter than the central portion during expansion. When both ends of the stent are warped, the endothelial tissue of the tubular tissue is stimulated, which may cause restenosis due to cell proliferation.

Further, in the conventional stent, generally, a space formed between the stent struts at the time of expansion is large, and the endothelial tissue of the tubular tissue protrudes greatly from the space, thereby causing restenosis. Sometimes. This is because the size of the basic cell constituting the stent is large, and in order to make it small, the width of the strut needs to be made small. There is a problem that the force that can withstand the radial stress is reduced.

[0009]

SUMMARY OF THE INVENTION In view of these circumstances, the present invention is intended to solve the problem that the blood vessel is flexible in the axial direction and has no contraction in the axial length of the stent upon expansion. Very strong resistance to the force you are trying to
Another object of the present invention is to provide a stent capable of uniformly expanding the struts of the stent and free from the problem that both ends of the stent are warped to a larger diameter than the central portion during expansion.

[0010]

SUMMARY OF THE INVENTION The present invention is a stent formed in a generally tubular body and extensible radially outward of the substantially tubular body, the stent having a substantially corrugated shape capable of circumferentially extending. Component 2 and substantially corrugated component 3 that can be extended in the axial direction
The plurality of circumferentially extensible substantially corrugated components 2 are arranged in the substantially circumferential direction of the stent without being directly connected to each other, and the plurality of axially expandable substantially wave-like components 2 are arranged. The corrugated components 3 are not directly connected to each other but are arranged in a substantially circumferential direction of the stent, and they are alternately and continuously arranged in the axial direction of the stent.

The present invention further relates to a stent formed in a substantially tubular body and extensible in a radially outward direction of the substantially tubular body, wherein the stent has a substantially corrugated component 2 and an axially extensible shaft. And a connecting portion 207 at one end of the circumferentially extensible substantially corrugated component 3 and a connecting portion of one end of the axially extensible substantially corrugated component 3. The connection part 30 at the other end of the substantially corrugated component 3 to which the part 301 is connected and which can be extended in the axial direction.
9 and the above-described substantially corrugated component that is circumferentially extensible by connecting the connecting portion 201 at one end of the substantially corrugated component 2 opposite to the 207 of the substantially corrugated component 2 that is separately expandable in the circumferential direction. 2 and a substantially corrugated component 3 which can be extended in the axial direction are periodically continuous, and furthermore, a connection portion 203 of a convex portion of a peak or a valley of the substantially corrugated component 2 which can be extended in the circumferential direction is connected to the axial direction. The connecting portion 301 at one end of the substantially corrugated component 3 that can be extended is connected to the connecting portion 309 at the other end of the substantially corrugated component 3 that is extensible in the axial direction, and is connected to a circumferential direction separate from the above. By connecting the connecting portion 205 of the convex portion of the peak or valley existing on the opposite side of the expandable substantially corrugated component 2 to the circumferentially extensible substantially corrugated component 2 in the axial direction. A stent in which the expandable substantially corrugated component 3 is formed continuously and periodically; It is also provided with.

[0012] The above-mentioned stent has a combination of a circumferentially extensible element and an axially extensible element, thereby reducing the axial contraction of the stent at the time of expansion. With the proper arrangement of the corrugated components, it is flexible in the axial direction, expands evenly upon expansion, and can exhibit a large resistance to the force of contraction of the blood vessel. is there.

Further, according to the present invention, the plurality of circumferentially extensible substantially wave-like components 2 which are directly continuous only at both ends in the axial direction of the stent are arranged along the circumference of the stent. The stent is also characterized in that the stent ends have a greater resistance to the force of contraction of the blood vessel than the stent central portion, and the stent ends are at the central portion during expansion. The present invention achieves the above object by reducing warping to a larger diameter.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the stent according to the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is an exploded view of a stent 1 according to the present invention. The stent 1 is formed in a substantially tubular body and is expandable in a radially outward direction of the tubular body. The stent 1 includes a substantially corrugated component 2 that can be expanded in a circumferential direction and a substantially corrugated component that can be expanded in an axial direction. The three circumferentially extensible substantially corrugated components 2 are arranged in the substantially circumferential direction of the stent without being directly connected to each other, and the six axially extensible substantially corrugated components 2 are arranged. The substantially corrugated components 3 are not directly connected to each other but are arranged in the circumferential direction of the stent, and they constitute the stent continuously and alternately in the axial direction of the stent. The number of the circumferentially extensible substantially corrugated components 2 and the axially extensible substantially corrugated components 3 per circumference is determined according to the length and outer diameter of the stent to be manufactured. However, the invention is not limited to the three circumferentially extensible substantially corrugated components 2 and the six axially extensible substantially corrugated components 3. Stent 1
By having both a circumferentially extensible element and an axially extensible element of the stent, it can be expanded radially outwardly, thereby reducing axial contraction of the stent. Further, the substantially corrugated components 2, 3 which can be extended in the circumferential direction or the axial direction are arranged in the substantially circumferential direction of the stent without being directly connected to each other, so that flexibility can be imparted to the stent. It is.

The term "constituent element which can be extended in the circumferential direction or in the axial direction" as used herein means an element having a structure capable of extending in the circumferential direction of the tubular stent and the axial direction (longitudinal direction) of the stent, respectively. Meaning, it is desirable that the structure be further shrinkable. For example, when the stent is placed in a straight blood vessel, there is no problem with the deformation that only stretches basically, but when the stent is placed in a bent blood vessel, outside the bend, other than the stretching that occurs during expansion, This causes extra stretching for placement in the shape of a blood vessel.
In this case, if contraction deformation is possible inside the bent portion, it is possible to reduce the possibility that the distance between the stent struts becomes too large due to excessive stretching outside the bent blood vessel. The substantially corrugated components 2 and 3 shown in the stent 1 that can be expanded in the circumferential direction and further in the axial direction are structures that can be contracted.

Further, as long as the substantially waveform components 2 and 3 can be extended in the circumferential direction and the axial direction, various shapes other than those shown in FIG. 1 are possible. For example, the substantially corrugated component 2 that can be extended in the circumferential direction can be adjusted in angle and the like to adjust the required size at the time of extension and the required expansion force, and the shape can be changed such as forming the whole as a curved surface. is there. However, it is preferable that the circumferentially extensible substantially corrugated component 2 has a structure having two or more peaks and valleys in total, and if it is less than 2, it has a stretching ability and a connection point. Difficult to secure the number of. More preferably, a structure having four is preferable. The circumferentially extensible substantially corrugated component 2 of the stent 1 shown in FIG. 1 has peaks and valleys at the ends, and the total number of peaks and valleys including the ends is four.
Individual. A substantially corrugated component 3 that can be further extended in the axial direction
For the adjustment of the required dimensions at the time of extension and the expansion force, various shapes are possible, for example, with respect to the number and angle of the bent portions. However, it is preferable that the number of peaks and valleys of the substantially corrugated components 3 that can be extended in the axial direction be a structure having one or more, and it is difficult to have the extension capability without one. A structure having two or four, more preferably four is more preferable. Stent 1 shown in FIG.
The total number of peaks and valleys of the substantially waveform component 3 that can be extended in the axial direction is four.

The circumferential element 4, which is formed by disposing a plurality of circumferentially extensible substantially wave-like components 2 which are not directly continuous, is arranged substantially in the circumferential direction of the stent, and has a shorter axial length. When the stent is inserted into a bent blood vessel, the stent is smoothly bent, which is preferable without damaging the blood vessel wall. Preferably, it is desirable to have 5 or more circumferential elements 4 per 10 mm of the stent.

If the number of the substantially wave-like components 2 that can be extended in the circumferential direction and the number of the substantially wave-shaped components 3 that can be extended in the axial direction per circumference are small, a large blood vessel holding force cannot be expected. Preferably, there are three or more substantially wavelike components 2 that can be extended in the circumferential direction, and six or more substantially wavelike components 3 that can be stretched in the axial direction per circumference. In this case, High vascular retention can be achieved.

At both ends of the stent 1, the above-mentioned circumferentially extensible substantially corrugated components 2 are directly and continuously connected to each other, and a circumferentially extensible substantially corrugated shape is formed over one round. As a result, both ends of the stent have greater resistance to the force of contraction of the blood vessel than the central portion of the stent, and there is no problem that both ends of the stent are warped to a larger diameter than the central portion during expansion. .

The length of the substantially wavy component 2 extending in the circumferential direction, which constitutes both ends in the axial direction of the stent, is substantially the same as the length extending in the circumferential direction constituting other than both ends in the axial direction of the stent. It is possible to shorten the corrugated component 2 in comparison with the stent axial length. In this case, there is no problem in that the resistance to the force of the blood vessel to contract further becomes greater than in a case where this is not performed, and there is no problem that both ends of the stent are warped to a larger diameter than the central portion during expansion. .

In addition, it is possible to increase the width of the strut of the substantially corrugated component 2 that can be extended in the circumferential direction only at the ends in the axial direction of the stent, as compared with portions other than the ends in the axial direction of the stent. In this case, there is no problem in that the resistance to the force of the blood vessel to contract further becomes greater than in a case where this is not performed, and there is no problem that both ends of the stent are warped to a larger diameter than the central portion during expansion. . However, the strut here means a linear member constituting the stent.

In addition, it is possible to increase the thickness of the struts of the substantially corrugated components 2 that can be expanded in the circumferential direction only at the ends in the axial direction of the stent, as compared with portions other than the ends in the axial direction of the stent. In this case, there is no problem in that the resistance to the force of the blood vessel to contract further becomes greater than in a case where this is not performed, and there is no problem that both ends of the stent are warped to a larger diameter than the central portion during expansion. .

In addition, the length of the substantially corrugated component 2 that can be extended in the circumferential direction in the axial direction of the stent is shorter at both ends in the axial direction of the stent than in portions other than both ends in the axial direction of the stent. It is also possible to use a combination of a large strut and a thick strut. One or more stents selected from the circumferentially extensible substantially corrugated component 2 and the axially extensible substantially corrugated component 3 as the stent transitions from the axial center portion to the end portion. It is possible to gradually reduce the axial length. In this case, the resistance to the force that the blood vessel tries to contract becomes greater than when not doing this,
In addition, there is no problem that both ends of the stent are warped to a larger diameter than the central part at the time of expansion, and the flexibility in the stent axial direction does not have a large change, and the flexibility can be changed stepwise. .

In addition, as the stent moves from the central portion in the axial direction to the end portion, one selected from the substantially corrugated component 2 extensible in the circumferential direction and the substantially corrugated component 3 extensible in the axial direction. It is possible to gradually increase the width of the above strut. In this case, there is no problem that the resistance to the force of the blood vessel to contract further becomes larger than in a case where this is not performed, and that both ends of the stent are warped to have a larger diameter than the central portion at the time of expansion. Further, the flexibility in the axial direction of the stent does not largely change, and the flexibility can be changed stepwise.

Further, as the stent moves from the axial center portion to the end portion, one selected from the circumferentially expandable substantially corrugated component 2 and the axially expandable substantially corrugated component 3. It is possible to gradually increase the thickness of the above strut. In this case, there is no problem that the resistance to the force of the blood vessel to contract further becomes larger than in a case where this is not performed, and that both ends of the stent are warped to have a larger diameter than the central portion at the time of expansion. Further, the flexibility in the axial direction of the stent does not largely change, and the flexibility can be changed stepwise.

[0027] Further, as the stent moves from the central portion in the axial direction to the end portion, one selected from the substantially corrugated component 2 that can be expanded in the circumferential direction and the substantially corrugated component 3 that can be expanded in the axial direction. To gradually reduce the length of the above stent axial direction, gradually increase the width of the strut,
It is also possible to increase the strut thickness step by step.

The stent 1 shown in FIG.
Nine rows of circumferentially expandable substantially waveform components 2 including both ends, and eight rows of axially expandable substantially waveform components 3 are alternately and continuously formed. Nine rows of substantially wavy components 2 which can extend in the circumferential direction including both ends,
Eight rows of the axially extensible substantially corrugated components 3 are determined according to the length and the outer diameter of the stent to be produced, and the circumferentially extensible substantially corrugated components 2 including both ends are arranged. It is not limited to nine rows and eight rows of the substantially waveform components 3 that can be extended in the axial direction.

As shown in FIG. 1, the circumferentially extensible substantially corrugated components 2 are arranged in the circumferential direction of the stent and are not directly continuous. The axially expandable substantially corrugated components 3 are also arranged in the circumferential direction of the stent, and are not directly continuous.

FIG. 2 shows one embodiment of the substantially corrugated component 2 which can be extended in the circumferential direction, and FIG. 3 shows one embodiment of the substantially corrugated component 3 which can be extended in the axial direction. The circumferentially extensible substantially corrugated component 2 includes linear portions 202, 204, 206 and connecting portions 201, 203, 205, 207, and the axially extensible substantially corrugated component 3 includes a linear portion. 303,3
05, 307, connecting portions 301, 309 and bending portion 30
2, 304, 306, and 308. Since all of the connecting portions 201, 203, 205, and 207 are connected to either of the connecting portions 301 or 309, respectively, when the stent is expanded, the circumferentially extensible substantially corrugated component 2 and the The force is easily transmitted evenly to the substantially corrugated component 3 that can be extended in the axial direction, and the stent strut can be uniformly expanded.

The linear portions 202, 204, and 206 of the substantially waveform component 2 that can be extended in the circumferential direction, and the linear portions 303 and 305 of the substantially waveform component 3 that can be extended in the axial direction.
Regarding 307, when the width and thickness of the strut are increased (thickened), the flexibility in the axial direction of the stent is impaired. On the other hand, when the width and thickness are reduced (thinned), the force that can withstand the radial stress received from the outer periphery decreases. Would. Therefore, in order to preferably satisfy both the performance of the stent in the axial direction and the performance of withstanding the radial stress received from the outer periphery, the linear portion of the circumferentially extensible substantially corrugated component 2 is preferably used. 202, 204, and 206 are preferably 80 to 150 micrometers in width and 70 to 150 micrometers in thickness, and more preferably 120 to 140 micrometers in width and 100 to 1 in thickness.
20 micrometers is preferred. Also, the linear portions 303, 305, 3 of the substantially waveform component 3 which can be extended in the axial direction.
07 preferably has a width of 50 to 100 micrometers and a thickness of 50 to 150 micrometers, and more preferably has a width of 60 to 80 micrometers and a thickness of 80 to 120 micrometers. However, both of the substantially waveform components 2 and 3 which can be extended in the circumferential direction,
Depending on the material constituting the stent and the site used,
It is possible to adjust to various sizes other than the above dimensions.

If the circumferentially extensible substantially corrugated component 2 has a long axial length, when the stent is inserted into a bent blood vessel, the stent cannot be bent smoothly and the strut is likely to stand up. Conversely, if the length of the circumferentially expandable substantially corrugated component 2 in the axial direction is short, the stent cannot be expanded to a necessary stent diameter when the stent is expanded. Also, if the axial length of the substantially corrugated component 3 that can be extended in the axial direction is long, the space formed between the stent struts at the time of expansion becomes large, and the endothelial cells of the tubular tissue protrude greatly from this space. It may cause restenosis. Conversely, if the axial length of the substantially corrugated component 3 which can be extended in the axial direction is short, the axial flexibility of the stent is impaired. Therefore, the axial length of the circumferentially extensible substantially corrugated component 2 is equal to 0.1.
It is preferably from 8 mm to 1.8 mm, more preferably from 1.0 mm to 1. 8 mm.
4 millimeters. Further, the axial length of the substantially corrugated component 3 which can be extended in the axial direction is preferably 0.5 mm to 1.5 mm, more preferably 0.7 mm to 1.0 mm. . However, it is possible to adjust the sizes of the substantially corrugated components 2 and 3 to various sizes other than those described above, depending on the material constituting the stent and the site used.

The stent according to the present invention is made of stainless steel, Ni-Ti alloy, Cu-A having appropriate rigidity and elasticity.
It can be made of a metal such as an l-Mn alloy or a polymer material having appropriate rigidity and elasticity.

[0034] The stent according to the present invention may be finished by plating with a protective material, impregnating a medicament, and covering with a material.

As the stent molding method, a laser machining method, an electric discharge machining method, a mechanical cutting method, an etching method, and the like can be used.

FIG. 4 is a development view of the stent according to the present invention when mounted on a balloon catheter. FIG.
As shown in the figure, even when mounted on a balloon catheter, the circumferentially expandable substantially corrugated components 2 are arranged in the circumferential direction of the stent, and the axially expandable substantially corrugated components 3 are also arranged. Arranged in the circumferential direction of the stent,
A circumferential element 4 in which the circumferentially extensible substantially corrugated components 2 are arranged in the circumferential direction, and a circumference in which the axially extensible substantially corrugated components 3 are arranged in the circumferential direction. The elements alternate with each other in the axial direction of the stent. This allows
When the stent is expanded, even if the circumferentially expandable substantially corrugated component 2 contracts in the axial direction, the axially expandable substantially corrugated component 3 expands in the axial direction. Can maintain approximately the same length before and after stent expansion.

FIG. 5 shows another embodiment according to the present invention, in which only a plurality of circumferentially extensible substantially wave-like components 2 directly continuous with each other in the axial direction are formed on the stent. The stent is arranged in the circumferential direction, and has an axial length shorter than the axial length of the circumferentially extensible substantially corrugated component 2 that constitutes other than both ends of the stent in the axial direction. Thus, the warp of the strut at the end of the stent can be reduced, and the resistance to the force at which the blood vessels at both ends try to contract can be increased. Further, by increasing the strut width and thickness only at both ends, it is possible to increase the resistance to the force of the blood vessel to contract.

[0038]

According to the present invention, it is flexible in the axial direction, and
During expansion, there is no contraction in the axial length of the stent, the resistance to the force of the blood vessel to contract is very large, and it is possible to expand the struts of the stent evenly. A stent is provided which does not have a problem that both ends of the stent are warped to a larger diameter than the center.

[Brief description of the drawings]

FIG. 1 is a development view of a stent 1 according to the present invention.

FIG. 2 is a substantially wave-shaped component 2 that is circumferentially extensible.

FIG. 3 shows a substantially corrugated component 3 which can be extended in the axial direction.

FIG. 4 is a development view of the stent 1 of the present invention when not expanded.

FIG. 5 is a development view of another example of the stent according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stent 2 Circular component which can expand in the circumferential direction 3 Circular component which can be expanded in the axial direction 4 Circular element 201,203,205,207 Connecting part 202,204,206 Linear part 301,309 Connecting part 302, 304, 306, 308 Curved section 303, 305, 307 Straight section

Claims (11)

[Claims] 1. A stent formed in a substantially tubular body and extensible radially outwardly of the substantially tubular body, the stent axially extending with a substantially wavy component 2 extensible in a circumferential direction. And a plurality of said circumferentially extensible substantially corrugated components 2 are arranged in a substantially circumferential direction of the stent without being directly connected to each other.
A plurality of the axially extensible substantially corrugated components 3 are arranged in the substantially circumferential direction of the stent without being directly connected to each other, and they are alternately and periodically continuous with each other in the stent axial direction. A stent characterized by the above-mentioned. 2. A stent formed in a generally tubular body and extensible radially outwardly of the substantially tubular body, said stent being axially extensible with a substantially corrugated component 2 extensible in a circumferential direction. And a connecting portion 207 at one end of the substantially wave-like component 2 that is extendable in the circumferential direction and a connecting portion 301 at one end of the substantially wave-like component 3 that is extendable in the axial direction. The connecting portion 309 at the other end of the substantially corrugated component 3 that is connected and extendable in the axial direction is connected to the connecting portion 309 of the substantially corrugated component 2 that is separately expandable in the circumferential direction.
The substantially corrugated component 2 that can be extended in the circumferential direction and the substantially corrugated component 3 that can be extended in the axial direction are periodically connected to each other by connecting the connecting portion 201 at one end on the opposite side to the circle. The connecting portion 203 of the convex portion of the peak or the valley of the substantially waveform component 2 that can be extended in the circumferential direction is connected to the connection portion 301 at one end of the substantially waveform component 3 that can be extended in the axial direction, and is connected in the axial direction. The connecting portion 309 at the other end of the expandable substantially corrugated component 3 and the convex portion of the crest or valley present on the opposite side of the circumferentially extensible substantially corrugated component 2 separate from the above. Are connected to each other, so that the substantially waveform component 2 that can be extended in the circumferential direction and the substantially waveform component 3 that can be extended in the axial direction are periodically and continuously formed. 3. The substantially waveform-extensible substantially wave-like component 2 is a substantially wave-like component in which the wave traveling direction is the circumferential direction of the stent and the sum of the peaks and valleys is 2 or more. The said substantially axially extensible substantially waveform component 3 is a substantially waveform in which the direction of a wave is the axial direction of a stent, and the number of peaks and valleys combined is 1 or more. Stent. 4. The circumferentially extensible substantially corrugated component 2 has peaks and valleys at its ends, and the total number of peaks and valleys including the ends is four. The substantially corrugated component 3 having a substantially waveform shape and capable of extending in the axial direction is such that the wave traveling direction is the axial direction of the stent and the sum of the peaks and valleys is four.
4. The stent according to claim 3, wherein the stent has a substantially waveform. 5. A stent formed in a substantially tubular body and extensible radially outward of the substantially tubular body, said stent comprising a substantially corrugated component 2 shown in FIG. And a substantially waveform component 3 that can be extended in the axial direction shown in FIG. 3. The connection portion 207 of the substantially waveform component 2 and the connection portion 301 of the substantially waveform component 3 are connected to each other. By connecting the connecting portion 309 of the waveform component 3 and the connecting portion 201 of the substantially waveform component 2, the substantially waveform component 2 and the substantially waveform component 3 are periodically continuous, and further, the substantially waveform component 2 is connected. The connection portion 203 of the substantially waveform component 3 is connected to the connection portion 301 of the substantially waveform component 3, and the connection portion 205 of the substantially waveform component 2 is connected to the connection portion 309 of the substantially waveform component 3. The component 2 and the substantially waveform component 3 are All of the connecting portions 201, 203, 205, and 207 of the substantially waveform component 2
The connecting portion 30 of the substantially waveform component 3 is connected to any one of the connection portions 301 and 309 of the substantially waveform component 3.
1, 309 are all connected portions 2 of the substantially waveform component 2.
A stent, wherein the stent is connected to any of 01, 203, 205, and 207. 6. The stent shown in FIG. 1 which is formed in a substantially tubular body and can be extended radially outward of the substantially tubular body. 7. A circumferential element which is arranged in the circumferential direction without directly connecting the circumferentially extensible substantially corrugated components 2 is defined by a predetermined distance from the adjacent circumferential elements. 7. A stent according to claim 1, wherein the stent is arranged with an angular offset and the circumferential elements are continuous with each other via the axially expandable substantially corrugated component. 8. The stent according to claim 1, wherein a plurality of directly circumferentially extensible substantially wave-like components 2 are arranged along the circumference of the stent only at both ends in the axial direction of the stent. The stent according to claim 1, wherein the stent is formed. 9. The circumferentially extensible substantially corrugated component 2 that constitutes both ends in the axial direction of the stent, and the circumferentially extensible substantially corrugated component 2 that constitutes other than both ends in the axial direction of the stent. Compared to 1. The length in the axial direction of the stent is short. 2. Struts are wide. The stent according to claim 8, which corresponds to one or more selected from struts having a large thickness. 10. The stent according to claim 1, wherein at least one selected from the circumferentially extensible substantially corrugated component 2 and the axially extensible substantially corrugated component 3 is provided from an axial center portion to an end portion of the stent. As it changes, 1. The length of the stent in the axial direction gradually decreases. 2. The strut width gradually increases. 9. The stent according to claim 8, which corresponds to one or more selected from the group consisting of a thick strut. 11. A circumferential element, in which the circumferentially extensible substantially corrugated components 2 are not directly connected to each other but arranged in a substantially circumferential direction of the stent, have an axial length of the stent of 10 mm. The stent according to claim 1, wherein the number of the stents is 5 or more.