JPH10201856A - Stent - Google Patents
StentInfo
- Publication number
- JPH10201856A JPH10201856A JP2601597A JP2601597A JPH10201856A JP H10201856 A JPH10201856 A JP H10201856A JP 2601597 A JP2601597 A JP 2601597A JP 2601597 A JP2601597 A JP 2601597A JP H10201856 A JPH10201856 A JP H10201856A
- Authority
- JP
- Japan
- Prior art keywords
- stent
- circumferential
- line
- line portion
- expandable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば血管、尿管
等の人体の管状器官に挿入され、管状器官の内腔を開い
た状態に維持させるためのステントに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stent that is inserted into a tubular organ of a human body, such as a blood vessel or a ureter, and maintains the lumen of the tubular organ open.
【０００２】[0002]
【従来の技術】例えば心筋梗塞等の治療に際して、血管
の狭窄部にステントと呼ばれる拡張具を挿入し、血管の
閉塞を防止する治療が行われている。また、尿管結石等
の治療に際しても、結石が排出されやすくするため、尿
管を拡張した状態に維持するために、ステントを使用す
ることがある。2. Description of the Related Art In the treatment of myocardial infarction and the like, for example, a treatment for preventing occlusion of a blood vessel is performed by inserting a dilator called a stent into a stenotic portion of the blood vessel. Also, in the treatment of ureteral stones and the like, a stent may be used to maintain the ureter in an expanded state in order to facilitate the discharge of stones.
【０００３】一般にステントは、縮径した形状でバルー
ンカテーテルの先端部外周に装着され、案内カテーテル
を通して閉塞患部に挿入された後、バルーンカテーテル
のバルーンを膨らませて強制的に押し広げ、その状態で
閉塞患部に留置させることにより、管状器官を拡張す
る。[0003] Generally, a stent is mounted on the outer periphery of the distal end of a balloon catheter in a reduced diameter shape, inserted into an occluded diseased part through a guide catheter, and then inflated by forcing the balloon of the balloon catheter to expand to obstruct the occlusion. The tubular organ is expanded by placing it in the affected area.
【０００４】従来のステントの一例として、実開平４−
３７４４５号には、軸方向に伸びる軸方向線材を周方向
に所定間隔で平行に配列し、これらの軸方向線材どうし
を周方向に伸びる周方向線材で互い違いの格子状に連結
して、全体として円筒状に構成したステントが開示され
ている（同公報の第２１図参照）。As an example of a conventional stent, Japanese Utility Model Application Laid-Open No.
No. 37445 discloses that axial wires extending in the axial direction are arranged in parallel in the circumferential direction at predetermined intervals, and these axial wires are connected to each other in a staggered lattice by circumferential wires extending in the circumferential direction. A stent configured in a cylindrical shape is disclosed (see FIG. 21 of the publication).
【０００５】このステントは、その内側からバルーンカ
テーテルで拡張押圧力を付与したとき、軸方向線材と周
方向線材とで囲まれた長方形状の枠体が、六角形状に広
がることによって、周方向に拡張するようになってい
る。[0005] In this stent, when an expansion pressing force is applied from the inside of the stent by a balloon catheter, a rectangular frame surrounded by an axial wire and a circumferential wire spreads in a hexagonal shape, so that the stent is circumferentially expanded. It is designed to be extended.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記実
開平４−３７４４５号に開示されたステントでは、長方
形状の枠体が六角形状に広がるとき、軸方向長さが短く
なって拡張前後の全長変化が大きいため、留置後の長さ
を考慮してステントを選択しなければならず、緊急時の
拡張に手間がかかるという問題があった。また、長方形
状の枠体が六角形状に広がる長さで拡張するだけなの
で、拡張前後の直径変化をそれほど大きくとれないとい
う問題があった。However, in the stent disclosed in Japanese Utility Model Application Laid-Open No. 4-37445, when the rectangular frame expands in a hexagonal shape, the length in the axial direction is shortened, and the total length before and after the expansion is changed. Therefore, the stent must be selected in consideration of the length after the indwelling, and there is a problem that it takes time and effort for emergency expansion. In addition, there is a problem that the diameter change before and after the expansion cannot be made so large because the rectangular frame only expands by a length that spreads in a hexagonal shape.
【０００７】したがって、本発明の目的は、拡張前後の
全長変化が小さく、しかも拡張前後の直径変化が大きい
ステントを提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stent in which the total length change before and after expansion is small and the diameter change before and after expansion is large.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明の第１は、線材を網状に連結して全体として
円筒状にしたステントにおいて、その縮径状態におい
て、周方向に沿って互いに平行に伸びる所定長さの周方
向線部と、これらの周方向線部どうしを鋭角状に連結す
る斜め線部とを有し、この斜め線部が前記周方向線部に
対して拡開することにより、拡径可能とされていること
を特徴とするステントを提供する。Means for Solving the Problems To achieve the above object, a first aspect of the present invention is to provide a stent in which wires are connected in a net shape to form a cylindrical shape as a whole. It has a circumferential line portion of a predetermined length extending in parallel with each other, and an oblique line portion connecting these circumferential line portions to each other at an acute angle, and the oblique line portion expands with respect to the circumferential line portion. By doing so, it is possible to provide a stent characterized in that the diameter can be expanded.
【０００９】本発明の第２は、前記第１の発明におい
て、前記斜め線部は、軸方向に連なるジグザグ要素をな
し、このジグザグ要素が互いに逆相に周方向に配列さ
れ、前記ジグザグ要素の互いに遠ざかっている折れ曲が
り部どうしが、前記周方向線部によって連結された形状
をなすステントを提供する。According to a second aspect of the present invention, in the first aspect, the oblique line portion forms a zigzag element that is continuous in the axial direction, and the zigzag elements are arranged in a circumferential direction in opposite phases to each other. Bent portions that are away from each other provide a stent configured to be connected by the circumferential line portion.
【００１０】本発明の第３は、前記第１の発明におい
て、前記周方向線部と前記斜め線部とが周方向に沿って
交互に連結されて周方向拡張列をなし、この周方向拡張
列が軸方向に複数、互いに平行に配置され、これらの周
方向拡張列の周方向線部どうしが軸方向に伸びる軸方向
線部で連結された形状をなすステントを提供する。According to a third aspect of the present invention, in the first aspect, the circumferential line portions and the oblique line portions are alternately connected along a circumferential direction to form a circumferential expansion row, A stent is provided in which a plurality of rows are arranged in the axial direction parallel to each other, and the circumferential lines of these circumferentially expanded rows are connected by axial lines extending in the axial direction.
【００１１】本発明の第４は、前記第１の発明におい
て、軸方向に連結された周方向に拡張しない拡張不能部
が周方向に所定間隔で配列され、この周方向に拡張しな
い拡張不能部どうしが、前記周方向線部と前記斜め線部
とで構成された周方向に拡張可能な拡張可能部で連結さ
れた形状をなすステントを提供する。According to a fourth aspect of the present invention, in the first aspect, the non-expandable circumferentially non-expandable portions are arranged at predetermined intervals in the circumferential direction, and the circumferentially non-expandable non-expandable portions. The present invention provides a stent having a shape which is connected to each other by a circumferentially expandable expandable portion constituted by the circumferential line portion and the oblique line portion.
【００１２】本発明の第５は、前記第１〜４の発明にお
いて、周方向に沿った線部の線幅よりも、軸方向に沿っ
た線部の線幅の方が狭くされているステントを提供す
る。A fifth aspect of the present invention is the stent according to the first to fourth aspects, wherein the line width of the line portion along the axial direction is narrower than the line width of the line portion along the circumferential direction. I will provide a.
【００１３】本発明の第６は、前記第１〜５の発明にお
いて、前記斜め線部は、前記周方向線部と連結する部分
で線幅を狭くされ、中間部は線幅を太くされているステ
ントを提供する。According to a sixth aspect of the present invention, in the first to fifth aspects, the oblique line portion has a reduced line width at a portion connected to the circumferential line portion, and the intermediate portion has a wider line width. Provide a stent that is
【００１４】本発明の第１によれば、周方向線部どうし
を鋭角状に連結する斜め線部が、周方向線部に対して鈍
角状に開くように変形することによって、周方向に大き
く拡張させることができ、しかも斜め線部は周方向線部
に対して鋭角から鈍角に開くとき、軸方向に一旦は伸び
るものの再び縮んで元の長さ又はそれに近い長さに戻る
ため、拡張前後におけるステントの全長変化を小さくす
ることができる。According to the first aspect of the present invention, the oblique line portion connecting the circumferential line portions at an acute angle is deformed so as to open at an obtuse angle with respect to the circumferential line portion, so that the circumferential line portion increases in the circumferential direction. When the oblique line part opens from an acute angle to an obtuse angle with respect to the circumferential line part, it expands once in the axial direction but contracts again to return to the original length or a length close to it. , The change in the overall length of the stent can be reduced.
【００１５】本発明の第２によれば、拡張させたとき
に、周方向線部と斜め線部とで囲まれた枠体が六角形の
ハニカム状になるので、管状器官の内壁を均一な網目で
支持することができ、拡張後の管状器官の再狭窄を効果
的に防止できる。According to the second aspect of the present invention, when expanded, the frame surrounded by the circumferential lines and the oblique lines becomes a hexagonal honeycomb, so that the inner wall of the tubular organ can be made uniform. It can be supported by a mesh and can effectively prevent restenosis of the tubular organ after expansion.
【００１６】本発明の第３によれば、周方向拡張列どう
しを軸方向線部で連結したので、周方向に並んだ線部が
軸方向線部だけとなる部分ができ、軸方向における可撓
性を向上させることができる。According to the third aspect of the present invention, since the circumferentially extending rows are connected to each other by the axial line portions, there is a portion where the line portions arranged in the circumferential direction are only the axial line portions. Flexibility can be improved.
【００１７】本発明の第４によれば、軸方向に連結され
た拡張不能部によって、ステントの軸方向長さが常に一
定に保たれるので、縮径時及び拡張時のみでなく、拡張
の途中における全長変化もなくなり、拡張作業中のステ
ントの位置ずれ等を効果的に防止することができる。According to the fourth aspect of the present invention, since the axial length of the stent is always kept constant by the non-expandable portion connected in the axial direction, not only at the time of diameter reduction and expansion but also at the time of expansion. There is no change in the overall length on the way, and it is possible to effectively prevent the displacement of the stent during the expansion work.
【００１８】本発明の第５によれば、周方向に沿った線
部の線幅よりも、軸方向に沿った線部の線幅の方が狭く
なるようにしたので、斜め線部が周方向線部に対して拡
開しやすくなり、拡張を容易に行うことができる。ま
た、軸方向に沿った線部の線幅の方が狭いので、軸方向
における柔軟性を向上させることができる。According to the fifth aspect of the present invention, the line width along the axial direction is narrower than the line width along the circumferential direction. It becomes easy to expand with respect to a direction line part, and expansion can be performed easily. Further, since the line width of the line portion along the axial direction is narrower, flexibility in the axial direction can be improved.
【００１９】本発明の第６によれば、斜め線部が、周方
向線部と連結する部分で線幅を狭くされ、中間部は線幅
を太くされているので、斜め線部が周方向線部に対して
拡開しやすくなり、拡張を容易に行うことができると共
に、斜め線部自体の強度を高めて拡張保持力をも高める
ことができる。According to the sixth aspect of the present invention, the diagonal line portion has a reduced line width at a portion connected to the circumferential line portion, and the intermediate portion has a wider line width. It becomes easy to expand with respect to a line part, and expansion can be performed easily, and the strength of the diagonal line part itself can be increased to increase the expansion holding force.
【００２０】[0020]
【発明の実施の形態】本発明のステントの材質は、特に
限定されないが、例えばステンレス、タンタル、チタ
ン、白金、金、タングステン、形状記憶合金などからな
る金属が好ましい。そして、本発明のステントは、例え
ば、上記のような金属の円筒体を作製し、この円筒体を
エッチング、レーザー加工などの手段で所定のパターン
にカットすることによって製造することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The material of the stent of the present invention is not particularly limited. For example, a metal made of stainless steel, tantalum, titanium, platinum, gold, tungsten, a shape memory alloy or the like is preferable. The stent of the present invention can be manufactured, for example, by preparing a metal cylinder as described above and cutting the cylinder into a predetermined pattern by means such as etching or laser processing.
【００２１】図１〜５には、本発明によるステントの一
実施例が示されている。図１は同ステントの全体を示す
斜視図、図２は同ステントの縮径状態の部分展開図、図
３は同ステントの縮径状態の部分拡大図、図４は同ステ
ントの拡張途中の状態の部分展開図、図５は同ステント
の拡張状態の部分展開図である。1 to 5 show one embodiment of a stent according to the present invention. 1 is a perspective view showing the entire stent, FIG. 2 is a partially developed view of the stent in a reduced diameter state, FIG. 3 is a partially enlarged view of the reduced diameter state of the stent, and FIG. 5 is a partially developed view of the stent in an expanded state.
【００２２】このステント１１は、図１〜３に示す縮径
状態において、所定長さで周方向Ａに平行に伸びる複数
本の周方向線部４１と、これらの周方向線部４１どうし
を鋭角状に連結する複数本の斜め線部５１とで構成され
た円筒状をなしている。より具体的には、斜め線部５１
が軸方向Ｂに連なってジグザグ要素５０をなし、このジ
グザグ要素５０が周方向Ａに所定間隔をおいて、隣接す
るものどうしで互いに逆相に複数配列され、これらのジ
グザグ要素５０の互いに離れた折れ曲がり部５２どうし
を周方向線部４１で連結した形状をなしている。In the diameter-reduced state shown in FIGS. 1 to 3, the stent 11 has a plurality of circumferential lines 41 extending in a predetermined length in parallel with the circumferential direction A, and these circumferential lines 41 are formed at acute angles. It has a cylindrical shape composed of a plurality of oblique lines 51 connected in a shape. More specifically, the oblique line portion 51
Are connected in the axial direction B to form a zigzag element 50, and a plurality of the zigzag elements 50 are arranged at predetermined intervals in the circumferential direction A in mutually opposite phases between adjacent ones, and these zigzag elements 50 are separated from each other. It has a shape in which the bent portions 52 are connected to each other by the circumferential line portions 41.
【００２３】特に図３に示すように、周方向線部４１の
線幅は、ステント１１の両端部に配置されたものを除
き、斜め線部５１の線幅よりも広くされている。また、
斜め線部５１は、周方向線部４１との連結部５１ａで特
に線幅を狭くされ、中間部５１ｂでは線幅を広くされて
いる。具体的には、周方向線部４１の線幅が１０〜５０
０μｍ、斜め線部５１の連結部５１ａの線幅が５〜３０
０μｍ、斜め線部５１の中間部５１ｂの線幅が１０〜５
００μｍとされることが好ましい。As shown in FIG. 3 in particular, the line width of the circumferential line portion 41 is wider than the line width of the oblique line portion 51 except for those arranged at both ends of the stent 11. Also,
The oblique line portion 51 has a particularly narrow line width at the connecting portion 51a with the circumferential direction line portion 41, and has a wide line width at the intermediate portion 51b. Specifically, the line width of the circumferential line portion 41 is 10 to 50.
0 μm, the line width of the connecting portion 51 a of the oblique line portion 51 is 5 to 30.
0 μm, the line width of the intermediate portion 51 b of the oblique line portion 51 is 10 to 5
It is preferably set to 00 μm.
【００２４】また、ステント１１の肉厚は、管状器官の
拡張に必要な保持力を付与でき、かつ、挿入時の柔軟性
を損なわないようにするため、５〜２００μｍとするこ
とが好ましい。また、ステント１０の直径及び長さは、
適用個所によって適宜定めればよいが、通常、直径２〜
１０mm、長さ５〜１００mmが好ましい。The thickness of the stent 11 is preferably 5 to 200 μm in order to provide a holding force necessary for expanding the tubular organ and not to impair the flexibility at the time of insertion. The diameter and length of the stent 10 are
The diameter may be appropriately determined depending on the application location,
It is preferably 10 mm and a length of 5 to 100 mm.
【００２５】更に、ステント１０の表面は、血栓が付着
するのを防止するために、ポリフッ化エチレン系樹脂、
ヘパリン含有樹脂、親水性樹脂等で被覆しておくことが
好ましい。Further, the surface of the stent 10 is made of a polyfluoroethylene resin to prevent thrombus from adhering.
It is preferable to coat with a heparin-containing resin, a hydrophilic resin or the like.
【００２６】次に、このステント１１の使用方法につい
て、血管の狭窄部に適用する例として説明する。Next, a method of using the stent 11 will be described as an example applied to a stenotic part of a blood vessel.
【００２７】まず、血管内に周知のセルディンガー法に
よって案内カテーテルを経皮的に挿入し、その先端部を
狭窄部の近傍に到達させる。そして、ステント１１をバ
ルーンカテーテル先端部のバルーンの外周に縮径状態で
装着しておき、バルーンカテーテルを上記案内カテーテ
ルを通して血管内に導く。First, a guide catheter is percutaneously inserted into a blood vessel by the well-known Seldinger method, and the distal end of the guide catheter reaches near the stenosis. Then, the stent 11 is mounted on the outer circumference of the balloon at the distal end of the balloon catheter in a reduced diameter state, and the balloon catheter is guided into the blood vessel through the guide catheter.
【００２８】更に、バルーンカテーテル内に挿入したガ
イドワイヤをガイドにして、バルーンカテーテルを更に
押し進め、その先端部に装着したステント１１を狭窄部
に配置させる。その状態で、バルーンカテーテルを通し
て生理食塩水などの液体をバルーン内に注入し、バルー
ンを膨らませてステント１１を拡張させる。Further, using the guide wire inserted into the balloon catheter as a guide, the balloon catheter is further pushed forward, and the stent 11 mounted on the distal end thereof is placed in the stenosis. In this state, a liquid such as saline is injected into the balloon through the balloon catheter, and the balloon is inflated to expand the stent 11.
【００２９】その結果、ステント１１の周方向線部４１
と斜め線部５１とのなす角度が、最初の鋭角状態から徐
々に開いていき、図４に示すようにほぼ直角状態になる
と、周方向線部４１と斜め線部５１とで長方形状の枠が
形成される。このとき、斜め線部５１が軸方向Ｂに対し
て真直ぐになるため、ステント１１の軸方向長さが最も
長くなる。As a result, the circumferential line portion 41 of the stent 11
When the angle between the oblique line portion 51 and the oblique line portion 51 gradually opens from the initial acute angle state and becomes substantially a right angle state as shown in FIG. Is formed. At this time, since the oblique line portion 51 is straight in the axial direction B, the axial length of the stent 11 is the longest.
【００３０】更にバルーンをふくらませて拡張させる
と、図５に示すように、ステント１１の周方向線部４１
と斜め線部５１とのなす角度が鈍角状になり、周方向線
部４１と斜め線部５１とで六角形のハニカム状の枠が形
成される。このとき、斜め線部５１は、軸方向Ｂに対し
て再び斜めになるため、ステント１１の軸方向長さは、
図１、２に示した縮径状態と同じかそれに近い長さに戻
る。When the balloon is further inflated and expanded, as shown in FIG.
The oblique line portion 51 forms an obtuse angle, and the circumferential line portion 41 and the oblique line portion 51 form a hexagonal honeycomb frame. At this time, since the oblique line portion 51 becomes oblique again to the axial direction B, the axial length of the stent 11 is:
The length returns to the same or close to the reduced diameter state shown in FIGS.
【００３１】したがって、このステント１１では、拡張
前後での軸方向長さがほとんど変わらず、拡張後の長さ
変化を考慮する必要がないので、拡張手術を容易かつ確
実に行うことができる。また、斜め線部５１が、周方向
線部４１に対して鋭角状から鈍角状に開くことにより、
周方向Ａにおける拡張長さ、言い換えると拡張時の直径
変化を大きくとることができる。Therefore, in the stent 11, the axial length before and after the expansion hardly changes, and it is not necessary to consider the change in the length after the expansion, so that the dilation operation can be performed easily and reliably. Further, the oblique line portion 51 opens from an acute angle to an obtuse angle with respect to the circumferential line portion 41,
The expansion length in the circumferential direction A, in other words, the diameter change at the time of expansion can be increased.
【００３２】なお、ステント１１を拡張した後、バルー
ン内の液体を抜き出してバルーンを萎ませ、バルーンカ
テーテルをステント１１の内周から抜き出してステント
１１を留置させる。こうして、ステント１１により血管
の狭窄部を拡張させて、心筋梗塞や脳梗塞などの予防
や、治療を行うことができる。After the stent 11 is expanded, the liquid in the balloon is extracted, the balloon is deflated, the balloon catheter is extracted from the inner periphery of the stent 11, and the stent 11 is placed. In this way, the stenotic portion of the blood vessel is expanded by the stent 11, so that prevention or treatment of myocardial infarction, cerebral infarction, and the like can be performed.
【００３３】図６、７には、本発明によるステントの他
の実施例が示されている。図６は縮径状態での部分展開
図、図７は拡径状態での部分展開図である。FIGS. 6 and 7 show another embodiment of the stent according to the present invention. FIG. 6 is a partial development view in a reduced diameter state, and FIG. 7 is a partial development view in a large diameter state.
【００３４】図６に示すように、このステント１２で
は、周方向線部４１と斜め線部５１とが交互に周方向Ａ
に沿って連結され、環状の周方向拡張列５３をなしてい
る。そして、この周方向拡張列５３が軸方向Ｂに複数、
所定間隔で配列され、それらが軸方向線部６１で軸方向
Ｂに連結されて、全体として円筒状に構成されている。
なお、軸方向線部６１は、軸方向Ｂに対向する周方向線
部４１どうしをそれぞれ連結している。As shown in FIG. 6, in the stent 12, the circumferential line portions 41 and the oblique line portions 51 are alternately arranged in the circumferential direction A.
Along with each other to form an annular circumferentially extending row 53. And a plurality of the circumferential extension rows 53 are provided in the axial direction B,
They are arranged at predetermined intervals, and they are connected in the axial direction B by an axial line portion 61, so that they are formed into a cylindrical shape as a whole.
The axial line portions 61 connect the circumferential line portions 41 facing each other in the axial direction B.
【００３５】このステント１２は、周方向拡張列５３の
周方向線部４１に対して斜め線部５１が拡開することに
より、図７に示すように周方向Ａに拡張する。このと
き、斜め線部５１は、周方向線部４１に対して鋭角状か
ら鈍角状に開くが、最終的には軸方向長さがほとんど変
わらないため、拡張前後での全長変化は小さい。また、
斜め線部５１が、周方向線部４１に対して鋭角状から鈍
角状に開くことにより、拡張時の直径変化を大きくとる
ことができる。The stent 12 expands in the circumferential direction A as shown in FIG. 7 by the diagonal lines 51 expanding with respect to the circumferential lines 41 of the circumferential expansion row 53. At this time, the oblique line portion 51 opens from an acute angle to an obtuse angle with respect to the circumferential line portion 41, but since the axial length hardly changes finally, the total length change before and after expansion is small. Also,
Since the oblique line portion 51 opens from an acute angle to an obtuse angle with respect to the circumferential line portion 41, the diameter change at the time of expansion can be made large.
【００３６】図８、９には、本発明によるステントの更
に他の実施例が示されている。図８は縮径状態での部分
展開図、図７は拡径状態での部分展開図である。FIGS. 8 and 9 show still another embodiment of the stent according to the present invention. FIG. 8 is a partial development view in a reduced diameter state, and FIG. 7 is a partial development view in a large diameter state.
【００３７】図８に示すように、このステント１３は、
４つの辺６２で囲まれ、対向する角部を周方向Ａ及び軸
方向Ｂに向けられた枠と、この枠の周方向Ａに対向する
角部を連結する梁６３とで構成され、各辺６２と梁６３
とが三角形状に連結された三角形トラス構造からなる拡
張不能部６４を有し、この拡張不能部６４は、周方向Ａ
にも軸方向Ｂにも変形しない形状をなしている。そし
て、拡張不能部６４は、連結部６５を介して軸方向Ｂに
複数個連結されており、上記連結部６５が軸方向におけ
る屈曲性を付与している。As shown in FIG. 8, this stent 13
A frame surrounded by four sides 62 and having opposing corners directed in the circumferential direction A and the axial direction B, and a beam 63 connecting the corners of the frame opposing in the circumferential direction A, 62 and beam 63
Have a non-expandable portion 64 formed of a triangular truss structure connected in a triangular shape, and the non-expandable portion 64
In the axial direction B. The plurality of non-expandable portions 64 are connected in the axial direction B via the connecting portions 65, and the connecting portions 65 impart flexibility in the axial direction.
【００３８】そして、連結部６５を介して軸方向Ｂに連
結された拡張不能部６４が、周方向Ａに沿って複数、所
定間隔で配列されており、これらの間を周方向部材４１
とこれに連結された斜め部材５１とで構成される拡張可
能部５４で連結して、全体として円筒状に構成されてい
る。A plurality of non-expandable portions 64 connected in the axial direction B via the connecting portions 65 are arranged at predetermined intervals along the circumferential direction A.
And an oblique member 51 connected thereto, and are connected by an expandable portion 54 to form a cylindrical shape as a whole.
【００３９】拡張可能部５４は、図８に示す縮径状態で
は、周方向線部４１に対して斜め線部５１が鋭角状に連
結されているが、図９に示す拡張状態では、周方向線部
４１に対して斜め線部５１が鈍角状に開いて、拡張不能
部６４の間隔を周方向Ａに広げて拡張するようになって
いる。In the expandable portion 54, in the reduced diameter state shown in FIG. 8, the oblique line portion 51 is connected to the circumferential line portion 41 at an acute angle, but in the expanded state shown in FIG. The oblique line portion 51 opens at an obtuse angle with respect to the line portion 41 so that the interval between the non-expandable portions 64 is expanded in the circumferential direction A to expand.
【００４０】このステント１３は、拡張不能部６４が連
結部６５を介して軸方向Ｂに連結され、それによって拡
張の途中であっても全長が変化しないので、拡張前後で
のステント１３の位置ずれを効果的に防止することがで
きる。In this stent 13, since the non-expandable portion 64 is connected in the axial direction B via the connection portion 65, whereby the overall length does not change even during the expansion, the position of the stent 13 is shifted before and after the expansion. Can be effectively prevented.
【００４１】図１０〜１２には、本発明によるステント
の更に他の実施例が示されている。図１０は同ステント
の縮径状態の斜視図、図１１は縮径状態の部分展開図、
図１２は拡張状態の部分展開図である。FIGS. 10 to 12 show still another embodiment of the stent according to the present invention. 10 is a perspective view of the stent in a reduced diameter state, FIG. 11 is a partially developed view of the reduced diameter state,
FIG. 12 is a partial development view of the expanded state.
【００４２】このステント１０は、前記のように金属の
円筒体を特定のパターンにカットして形成したもので、
全体として円筒状をなしている。そして、上記パターン
は、２種類の枠状部分、すなわち拡張不能部２０と、拡
張可能部３０とを周方向に交互に連結して環状とし、か
つ、その環状部分を軸方向に複数個連結した形状をなし
ている。The stent 10 is formed by cutting a metal cylinder into a specific pattern as described above.
It has a cylindrical shape as a whole. In the pattern, two types of frame-shaped portions, that is, the non-expandable portion 20 and the expandable portion 30 are alternately connected in the circumferential direction to form an annular shape, and a plurality of the annular portions are connected in the axial direction. It has a shape.
【００４３】拡張不能部２０は、４つの辺２１で囲ま
れ、対向する角部を周方向Ａ及び軸方向Ｂに向けられた
枠と、この枠２１の周方向Ａに対向する角部を連結する
梁２２とで構成され、各辺２１と梁２２とが三角形状に
連結された三角形トラス構造をなし、周方向Ａにも軸方
向Ｂにも変形しない形状をなしている。そして、拡張不
能部２０は、連結部２３を介して軸方向Ｂに複数個連結
されており、上記連結部２３が軸方向における屈曲性を
付与している。The non-expandable portion 20 is surrounded by four sides 21, and connects a frame whose opposing corners are oriented in the circumferential direction A and the axial direction B to a corner of the frame 21 which opposes in the circumferential direction A. Each side 21 and the beam 22 form a triangular truss structure in which the sides 21 and the beam 22 are connected in a triangular shape, and have a shape that is not deformed in either the circumferential direction A or the axial direction B. The plurality of non-expandable portions 20 are connected in the axial direction B via the connecting portions 23, and the connecting portions 23 impart flexibility in the axial direction.
【００４４】拡張可能部３０は、軸方向Ｂに対向する２
つの周方向線部３１と、これらの周方向線部３１を縮径
状態において鋭角状にかつ内側に屈曲して連結する周方
向Ａに対向する２つの斜め線部３２とで囲まれた枠と、
この枠の軸方向Ｂに対向する２つの周方向線部３１を連
結するＸ字状の梁３３とで構成されている。そして、周
方向Ａに対向する２つの斜め線部３２は、図１、２の縮
径状態においては内側に湾曲しており、図３の拡径状態
においては外側に湾曲する。The expandable portion 30 is provided with two
A frame surrounded by two circumferential line portions 31 and two diagonal line portions 32 facing each other in the circumferential direction A for connecting these circumferential line portions 31 in an acute angle and inwardly in a reduced diameter state to connect them. ,
The frame comprises an X-shaped beam 33 connecting the two circumferential line portions 31 facing each other in the axial direction B. The two oblique line portions 32 facing each other in the circumferential direction A are curved inward in the reduced diameter state of FIGS. 1 and 2 and are curved outward in the enlarged diameter state of FIG.
【００４５】また、拡張可能部３０は、周方向Ａにおい
て、隣接する拡張不能部２０と連結部３４を介して連結
され、拡張可能部３０と拡張不能部２０とが周方向に交
互に連結されて環状をなしている。連結部３４は、拡張
可能部３０の周方向に対向する斜め線部３２の中間部
と、拡張不能部２０の周方向に対向する角部とを連結し
ている。The expandable portion 30 is connected to the adjacent non-expandable portion 20 via a connecting portion 34 in the circumferential direction A, and the expandable portion 30 and the non-expandable portion 20 are alternately connected in the circumferential direction. It has a ring shape. The connection portion 34 connects the middle portion of the oblique line portion 32 facing the circumferential direction of the expandable portion 30 and the corner portion facing the circumferential direction of the non-expandable portion 20.
【００４６】こうして、拡張可能部３０と拡張不能部２
０とが周方向に交互に連結されて環状をなし、かつ、拡
張不能部２０が連結部２３を介して軸方向に連結される
ことによって上記環状体が軸方向に所定個数連結され
て、円筒状のステント１０が構成されている。Thus, the expandable unit 30 and the non-expandable unit 2
0 are alternately connected in the circumferential direction to form a ring, and the non-expandable portion 20 is connected in the axial direction via the connecting portion 23 so that a predetermined number of the ring members are connected in the axial direction to form a cylinder. A stent 10 in a shape of a circle is formed.
【００４７】なお、拡張を容易にするため、上記連結部
３４が設けられた拡張可能部３０の周方向に対向する斜
め線部３２の中間部、及び拡張可能部３０の周方向に対
向する斜め線部３２と軸方向に対向する周方向線部３１
との角部３５は、他の部分よりも線幅を狭くされている
ことが好ましい。In order to facilitate the expansion, an intermediate portion of the diagonal line portion 32 facing the circumferential direction of the expandable portion 30 provided with the connecting portion 34 and an oblique line facing the circumferential direction of the expandable portion 30 are provided. Circumferential line portion 31 axially opposed to line portion 32
It is preferable that the corner portion 35 has a smaller line width than other portions.
【００４８】このステント１０は、拡張可能部３０の間
に拡張不能部２０が配置され、拡張可能部３０も拡張不
能部２０も所定の面積を有する枠状をなすので、血管等
の管状器官内壁を広い接触面積で平均して保持すること
ができ、内壁の組織がステント１０の隙間から内部に増
殖して再閉塞を起こす虞れが少なくなる。In the stent 10, the non-expandable portion 20 is arranged between the expandable portions 30, and both the expandable portion 30 and the non-expandable portion 20 form a frame having a predetermined area. Can be held on average over a wide contact area, and the possibility that the tissue of the inner wall grows inside the gap of the stent 10 and causes reocclusion is reduced.
【００４９】また、拡張不能部２０は、周方向Ａにも軸
方向Ｂにも変形せず、かつ、拡張可能部３０も、その周
方向に対向する斜め線部３２が縮径時には内側に湾曲
し、拡張時には外側に湾曲して、拡張前後における軸方
向長さが変化しない。このため、ステント１０は、拡張
前後における軸方向長さの変化がほとんどなく、拡張手
術を容易かつ確実に行うことができる。The non-expandable portion 20 does not deform in either the circumferential direction A or the axial direction B, and the expandable portion 30 also curves inward when the diagonal line portion 32 facing the circumferential direction is reduced in diameter. However, when it expands, it curves outward, and its axial length before and after expansion does not change. For this reason, the stent 10 has little change in the axial length before and after the expansion, and the dilation operation can be performed easily and reliably.
【００５０】[0050]
【発明の効果】以上説明したように、本発明によれば、
周方向線部どうしを鋭角状に連結する斜め線部が、周方
向線部に対して鈍角状に開くように変形することによっ
て、周方向に大きく拡張させることができ、しかも斜め
線部は周方向線部に対して鋭角から鈍角に開くとき、軸
方向に一旦は伸びるものの再び縮んで元の長さ又はそれ
に近い長さに戻るため、拡張前後におけるステントの全
長変化を小さくすることができる。As described above, according to the present invention,
The oblique line connecting the circumferential lines at an acute angle can be greatly expanded in the circumferential direction by being deformed so as to open at an obtuse angle to the circumferential line. When opening from an acute angle to an obtuse angle with respect to the direction line portion, the stent once extends in the axial direction but contracts again to return to the original length or a length close to the original length. Therefore, the change in the overall length of the stent before and after expansion can be reduced.
【図１】本発明のステントの一実施例を示す縮径状態の
斜視図である。FIG. 1 is a perspective view showing an embodiment of a stent of the present invention in a reduced diameter state.
【図２】同ステントの縮径状態における部分展開図であ
る。FIG. 2 is a partial development view of the stent in a reduced diameter state.
【図３】同ステントの縮径状態における部分拡大図であ
る。FIG. 3 is a partially enlarged view of the stent in a reduced diameter state.
【図４】同ステントの拡張途中における部分展開図であ
る。FIG. 4 is a partially expanded view of the stent during expansion.
【図５】同ステントの拡張状態における部分展開図であ
る。FIG. 5 is a partially expanded view of the stent in an expanded state.
【図６】本発明のステントの他の実施例を示す縮径状態
における部分展開図である。FIG. 6 is a partially expanded view showing another embodiment of the stent of the present invention in a reduced diameter state.
【図７】同ステントの拡張状態における部分展開図であ
る。FIG. 7 is a partially developed view of the stent in an expanded state.
【図８】本発明のステントの更に他の実施例を示す縮径
状態における部分展開図である。FIG. 8 is a partially developed view showing a further embodiment of the stent of the present invention in a reduced diameter state.
【図９】同ステントの拡張状態における部分展開図であ
る。FIG. 9 is a partially developed view of the stent in an expanded state.
【図１０】本発明のステントの更に他の実施例を示す斜
視図である。FIG. 10 is a perspective view showing still another embodiment of the stent of the present invention.
【図１１】同ステントの縮径状態における部分展開図で
ある。FIG. 11 is a partial development view of the stent in a reduced diameter state.
【図１２】同ステントの拡張状態における部分展開図で
ある。FIG. 12 is a partially expanded view of the stent in an expanded state.
１０、１１、１２、１３ ステント ２０ 拡張不能部 ２１ 辺 ２２ 梁 ２３ 連結部 ３０ 拡張可能部 ３１ 周方向線部 ３２ 斜め線部 ３３ Ｘ字状の梁 ３４ 連結部 ４１ 周方向線部 ５１ 斜め線部 ５１ａ 連結部 ５１ｂ 中間部 ５２ 折れ曲がり部 ５３ 周方向拡張列 ５４ 拡張可能部 ６１ 軸方向線部 ６２ 辺 ６３ 梁 ６４ 拡張不能部 ６５ 連結部 Ａ 周方向 Ｂ 軸方向 10, 11, 12, 13 Stent 20 Non-expandable part 21 Side 22 Beam 23 Connection part 30 Expandable part 31 Circumferential line part 32 Diagonal line part 33 X-shaped beam 34 Connection part 41 Circumferential line part 51 Diagonal line part 51a Connecting part 51b Intermediate part 52 Bent part 53 Circumferential expansion row 54 Expandable part 61 Axial line part 62 Side 63 Beam 64 Non-expandable part 65 Connection part A Circumferential direction B Axial direction
Claims (6)
にしたステントにおいて、その縮径状態において、周方
向に沿って互いに平行に伸びる所定長さの周方向線部
と、これらの周方向線部どうしを鋭角状に連結する斜め
線部とを有し、この斜め線部が前記周方向線部に対して
拡開することにより、拡径可能とされていることを特徴
とするステント。1. A stent in which wires are connected in a net-like shape to form a cylindrical shape as a whole, and in a reduced diameter state, a circumferential length of a predetermined length extending parallel to each other along a circumferential direction; A stent having a diagonal line portion connecting the line portions to each other at an acute angle, wherein the diagonal line portion expands with respect to the circumferential line portion so that the diameter can be expanded.
グ要素をなし、このジグザグ要素が互いに逆相に周方向
に配列され、前記ジグザグ要素の互いに遠ざかっている
折れ曲がり部どうしが、前記周方向線部によって連結さ
れた形状をなす請求項１記載のステント。2. The zigzag element according to claim 1, wherein the oblique line portion forms a zigzag element that extends in the axial direction. 2. The stent according to claim 1, wherein the stent has a shape connected by a wire portion.
向に沿って交互に連結されて周方向拡張列をなし、この
周方向拡張列が軸方向に複数、互いに平行に配置され、
これらの周方向拡張列の周方向線部どうしが軸方向に伸
びる軸方向線部で連結された形状をなす請求項１記載の
ステント。3. The circumferential line portion and the diagonal line portion are alternately connected along a circumferential direction to form a circumferential extension row, and a plurality of the circumferential extension rows are arranged in the axial direction in parallel with each other. ,
2. The stent according to claim 1, wherein the circumferential lines of the circumferential expansion rows are connected by axial lines extending in the axial direction.
拡張不能部が周方向に所定間隔で配列され、この周方向
に拡張しない拡張不能部どうしが、前記周方向線部と前
記斜め線部とで構成された周方向に拡張可能な拡張可能
部で連結された形状をなす請求項１記載のステント。4. A non-expandable circumferentially non-expandable portion connected in the axial direction is arranged at predetermined intervals in the circumferential direction, and the circumferentially non-expandable portions are separated from each other by the circumferential line portion and the diagonal line. The stent according to claim 1, wherein the stent is connected by a circumferentially expandable portion constituted by the portion.
向に沿った線部の線幅の方が狭くされている請求項１〜
４のいずれか１つに記載のステント。5. The line width of the line portion along the axial direction is smaller than the line width of the line portion along the circumferential direction.
5. The stent according to any one of 4.
する部分で線幅を狭くされ、中間部は線幅を太くされて
いる請求項１〜５のいずれか１つに記載のステント。6. The line according to claim 1, wherein a line width of the oblique line portion is reduced at a portion connected to the circumferential line portion, and a line width of the intermediate portion is wide. Stent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02601597A JP3519565B2 (en) | 1997-01-24 | 1997-01-24 | Stent |
| US08/986,060 US6027527A (en) | 1996-12-06 | 1997-12-05 | Stent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02601597A JP3519565B2 (en) | 1997-01-24 | 1997-01-24 | Stent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10201856A true JPH10201856A (en) | 1998-08-04 |
| JP3519565B2 JP3519565B2 (en) | 2004-04-19 |
Family
ID=12181879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02601597A Expired - Fee Related JP3519565B2 (en) | 1996-12-06 | 1997-01-24 | Stent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3519565B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002516704A (en) * | 1998-06-02 | 2002-06-11 | トランスバスキュラー インコーポレイテッド | Deformable multicellular support stent |
| US6416538B1 (en) | 1997-10-09 | 2002-07-09 | Scimed Life Systems, Inc. | Stent configurations |
| JP2003515386A (en) * | 1999-12-03 | 2003-05-07 | テラメッド・インコーポレイテッド | Endovascular graft system |
| JP2005523061A (en) * | 2002-04-19 | 2005-08-04 | ブロンカス テクノロジーズ， インコーポレイテッド | Device for maintaining a surgically created opening |
| JP2005534396A (en) * | 2002-08-02 | 2005-11-17 | オーセティカ リミテッド | Expandable tubular liner |
| CN108969165A (en) * | 2018-06-13 | 2018-12-11 | 哈尔滨工业大学 | A kind of 4D printing shape memory polymer composite material trachea bracket and preparation method thereof |
| JP2020533116A (en) * | 2017-09-12 | 2020-11-19 | ダブリュ．エル．ゴア アンド アソシエイツ，インコーポレイティドＷ．Ｌ． Ｇｏｒｅ ＆ Ａｓｓｏｃｉａｔｅｓ， Ｉｎｃｏｒｐｏｒａｔｅｄ | Substrate with rotatable struts for medical devices |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5496365A (en) | 1992-07-02 | 1996-03-05 | Sgro; Jean-Claude | Autoexpandable vascular endoprosthesis |
| US5695516A (en) | 1996-02-21 | 1997-12-09 | Iso Stent, Inc. | Longitudinally elongating balloon expandable stent |
-
1997
- 1997-01-24 JP JP02601597A patent/JP3519565B2/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6416538B1 (en) | 1997-10-09 | 2002-07-09 | Scimed Life Systems, Inc. | Stent configurations |
| US7335225B2 (en) | 1997-10-09 | 2008-02-26 | Boston Scientific Scimed, Inc | Stent configurations |
| US7951187B2 (en) | 1997-10-09 | 2011-05-31 | Boston Scientific Scimed, Inc. | Stent configurations |
| JP2002516704A (en) * | 1998-06-02 | 2002-06-11 | トランスバスキュラー インコーポレイテッド | Deformable multicellular support stent |
| JP2003515386A (en) * | 1999-12-03 | 2003-05-07 | テラメッド・インコーポレイテッド | Endovascular graft system |
| JP2005523061A (en) * | 2002-04-19 | 2005-08-04 | ブロンカス テクノロジーズ， インコーポレイテッド | Device for maintaining a surgically created opening |
| JP2005534396A (en) * | 2002-08-02 | 2005-11-17 | オーセティカ リミテッド | Expandable tubular liner |
| JP2020533116A (en) * | 2017-09-12 | 2020-11-19 | ダブリュ．エル．ゴア アンド アソシエイツ，インコーポレイティドＷ．Ｌ． Ｇｏｒｅ ＆ Ａｓｓｏｃｉａｔｅｓ， Ｉｎｃｏｒｐｏｒａｔｅｄ | Substrate with rotatable struts for medical devices |
| JP2022121526A (en) * | 2017-09-12 | 2022-08-19 | ダブリュ．エル．ゴア アンド アソシエイツ，インコーポレイティド | Substrate with rotatable struts for medical device |
| US11559387B2 (en) | 2017-09-12 | 2023-01-24 | W. L Gore & Associates, Inc. | Substrate with rotatable struts for medical device |
| CN108969165A (en) * | 2018-06-13 | 2018-12-11 | 哈尔滨工业大学 | A kind of 4D printing shape memory polymer composite material trachea bracket and preparation method thereof |
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| JP3519565B2 (en) | 2004-04-19 |
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