ES2379862T3 - Diseño de stent helicoidal - Google Patents

Diseño de stent helicoidal Download PDF

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Publication number
ES2379862T3
ES2379862T3 ES10177524T ES10177524T ES2379862T3 ES 2379862 T3 ES2379862 T3 ES 2379862T3 ES 10177524 T ES10177524 T ES 10177524T ES 10177524 T ES10177524 T ES 10177524T ES 2379862 T3 ES2379862 T3 ES 2379862T3
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Prior art keywords
stent
curvilinear
undulating
helical element
connectors
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Graig L. Kveen
Burns P. Doran
Robert T. Judnitch
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Boston Scientific Ltd Barbados
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Boston Scientific Ltd Barbados
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/88—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements formed as helical or spiral coils
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91508—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other the meander having a difference in amplitude along the band
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91516—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other the meander having a change in frequency along the band
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91525—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91533—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other characterised by the phase between adjacent bands
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/9155—Adjacent bands being connected to each other
    • A61F2002/91558—Adjacent bands being connected to each other connected peak to peak

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  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Animal Behavior & Ethology (AREA)
  • Optics & Photonics (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)
  • Dowels (AREA)
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Abstract

Un stent (10) que comprende: al menos un elemento (11) helicoidal alargado continuo, teniendo el al menos un elemento helicoidal alargado continuo partes (12) ondulantes que forman una configuración de serpentina y que se extienden sustancialmente sobre la longitud del cuerpo del stent, donde las partes ondulantes adyacentes están fuera de fase; y una pluralidad de conectores (14) curvilíneos, extendiéndose los conectores curvilíneos entre y las interconectan al menos algunas de las partes ondulantes adyacentes; caracterizado por que los conectores (14) curvilíneos están unidos a posiciones sobre las partes ondulantes distintas de los extremos terminales de las partes ondulantes.

Description

Disefo de stent helicoidal
ANTECEDENTES DE LA INVENCION
La presente invenci6n se refiere a stents. De forma general, un stent es un dispositivo que puede colocarse dentro
5 de una cavidad o espacio interior del cuerpo para facilitar y asegurar la permeabilidad de una cavidad. La permeabilidad se refiere a un estado de abertura libre y resulta especialmente importante en el sistema vascular. El campo de la angioplastia esta relacionado con la reconstrucci6n de vasos sanguineos y los stents se usan, por ejemplo, para mantener los vasos sanguineos abiertos o para recolocar desgarros de la intima dentro de los vasos despues de la angioplastia. No obstante, de forma mas general, los stents pueden ser usados dentro de las
10 cavidades de cualquier conducto fisiol6gico, incluyendo arterias, venas, vasos, el arbol biliar, el tracto urinario, el tracto elemental, el arbol traqueobronquial, el sistema genitourinario y el acueducto cerebral. Los stents pueden ser usados dentro de cavidades de animales y/o humanos.
Generalmente, los stents tienen una estructura tubular y pueden expandirse radialmente entre un tamafo o circunferencia de inserci6n no expandido y un tamafo o circunferencia de implante expandido que es mas grande
15 que el tamafo de inserci6n no expandido.
Una caracteristica importante de un stent es que sea compresible y expansible radialmente para que el mismo pase facilmente a traves de un vaso sanguineo o similar cuando esta plegado y se expanda o pueda expandirse hasta su tamafo de implante despues de haber alcanzado la ubicaci6n del implante. Tambien es deseable que un stent sea generalmente flexible en toda su longitud para que sea facilmente maniobrable en los angulos y curvas del sistema
20 vascular o similar para alcanzar la ubicaci6n del implante y que el stent pueda adaptarse a la ubicaci6n vascular al expandirse. De forma tipica, tambien es deseable que un stent tenga una cantidad de espacio abierto sustancial para permitir la endotelizaci6n a lo largo de su longitud y minimizar la reacci6n ante un cuerpo extrafo y la interferencia con los vasos sanguineos colaterales y similares.
Se han introducido varios tipos de stents y varios disefos de stents. De forma general, los stents se clasifican como
25 auto-expansibles, es decir, que se expanden por si mismos, y expansibles por globo, es decir, que se expanden mediante un globo introducido en el stent.
Desde el punto de vista de los materiales, los stents pueden clasificarse como realizados a partir de varios metales, tales como acero inoxidable, nitinol, y a partir de varios plasticos.
Los stents pueden estar realizados a partir de estructuras estandar tubulares a partir de las cuales es posible cortar
30 o morder un disefo deseado. Los mismos tambien pueden estar realizados a partir de alambre. Ambos tipos son bien conocidos.
En las patentes numeros de EE.UU nO 5.562.697, 5.540.713, 5.575.816, 5.569.295, 5.496.365, 5.344.426, 5.139.480, 5.135.536, 5.810.872, 5.226.913, 5.716.396 y 5.370.683.
Esta invenci6n se refiere a todos los tipos de stents discutidos anteriormente.
35 Un objetivo de la invenci6n es dar a conocer, como una realizaci6n preferida, un stent que comprende una serpentina enrollada helicoidalmente o una estructura ondulante que incluye elementos de conexi6n curvados, es decir, curvilineos, que produce celdas flexibles cerradas en forma expandida. En combinaci6n, las celdas flexibles proporcionan un stent continuo flexible que se expande de forma uniforme y permite obtener unas buenas caracteristicas de resistencia radial, estructurales y de fatiga al expandirse.
40 Los stents que incorporan el disefo de la invenci6n estan realizados preferiblemente a partir de cable, del mismo modo que en la tecnica anterior, o a partir de tubos, tales como tubos de metal, que se muerden o cortan por laser para obtener la configuraci6n deseada del stent segun la invenci6n.
La tecnica mencionada y/o descrita anteriormente no pretende constituir una admisi6n de que cualquier patente, publicaci6n u otra informaci6n referida en esta memoria sea "tecnica anterior" con respecto a la invenci6n. Ademas,
45 esta secci6n no se debe limitar a significar que se ha hecho una busqueda o que no existe otra informaci6n pertinente como se define en 37 C.F.R &1.56(a)
BREVE SUMARIO DE LA INVENCION
De forma general, la presente invenci6n proporciona un stent que comprende dos elementos estructurales principales, siendo el primero un elemento helicoidal alargado continuo que comprende preferiblemente partes 50 ondulantes separadas que forman partes de lazo extremas peri6dicas, es decir, una configuraci6n de serpentina, extendiendose el elemento helicoidal sustancialmente en la longitud del cuerpo del stent para crear una configuraci6n de stent cilindrica. El segundo elemento comprende una pluralidad de conectores curvilineos, mas preferiblemente sinusoidales, que se extienden al menos entre algunas de las partes ondulantes adyacentes del elemento helicoidal en su longitud y las interconectan, estando conectados preferiblemente a las partes de lazo
extremas. Tambien es posible usar una helice paralela doble o multiples helices paralelas, aunque es preferible la helice unica descrita a continuaci6n.
BREVE DESCRIPCION DE LOS DIBUJOS
La figura 1 es una vista lateral de un stent extendido en forma plana;
la figura 1a es una vista frontal de un stent antes de expandirse;
la figura 1b es una vista frontal de un stent despues de expandirse;
la figura 2 es una vista similar a la figura 1 de otro stent;
la figura 3 es una vista similar segun un tercer stent;
la figura 4 es nuevamente una vista similar de otro stent;
la figura 5 es una vista similar de un stent adicional;
la figura 6 es una vista similar de otro stent mas;
la figura 7 es una vista parcial en forma plana de otro stent;
la figura 8 es una vista parcial en forma plana de otro stent mas; y
la figura 9 es una vista parcial en forma plana de otro stent.
DESCRIPCION DETALLADA DE LA INVENCION
Aunque esta invenci6n puede presentar numerosas realizaciones, en la presente memoria se describen de forma detallada realizaciones preferidas especificas de la invenci6n. Esta descripci6n es una ejemplificaci6n de los principios de la invenci6n y no se pretende que limite la invenci6n a las realizaciones especificas mostradas.
En la figura 1 se muestra un stent 10. El stent 10 esta formado por una banda 11 helicoidal dispuesta en diagonal que esta dispuesta en espiral en forma cilindrica. La banda 11 incluye partes 12 ondulantes en toda su longitud continua para obtener una configuraci6n de serpentina. Tal como puede observarse en la figura, cada una de las partes ondulantes incluye partes 13 extremas de lazo. Cada parte 13 extrema de lazo esta interconectada a una parte 13 extrema separada longitudinalmente adyacente por un elemento 14 conector curvilineo que, en esta realizaci6n, incluye dos curvas o partes 14a, y 14b en forma de U para formar un conector que tiene una forma sinusoidal preferida. Ademas, tal como puede observarse en la figura 1, los elementos 14 de interconexi6n unen preferiblemente las partes 13 extremas por sus extremos y se extienden directamente entre partes extremas adyacentes separadas longitudinalmente. En un stent segun la invenci6n, los conectores estan unidos a otras posiciones de las ondulaciones diferentes a los extremos. Ademas, con respecto al stent de la figura 1, debe observarse que las ondulaciones estan desfasadas, tal como se indica mediante las lineas 16.
El stent esta conformado preferiblemente a partir de material estandar tubular cortado por laser. No obstante, el tubo tambien puede ser mordido. Es posible conformar una configuraci6n deseada a partir de lamina plana estandar que se dobla hasta la configuraci6n cilindrica deseada. Este es un procedimiento conocido en la tecnica.
Cuando un stent tal como el mostrado en la figura 1 se implanta en la cavidad de un cuerpo, tal como una arteria, con el stent presentando un diametro inicial D1 como el mostrado en la figura 1a al ser colocado en la cavidad y en la ubicaci6n deseada, el stent puede curvarse y doblarse facilmente en una cavidad serpenteante durante su colocaci6n. A continuaci6n, el stent se expande para presentar un segundo diametro D2 como el mostrado en la figura 1b, que es mas grande que el diametro inicial D1, de modo que el stent queda implantado.
Cuando el stent se coloca y expande, se usa preferiblemente una unidad de cateter de colocaci6n con un elemento expansible, tal como un globo, tal como es conocido en la tecnica. Cuando la unidad de cateter con el globo se usa para colocar el stent, el stent esta montado en el globo y la unidad de cateter se empuja hasta la ubicaci6n del implante. A continuaci6n, el globo se infla, aplicando radialmente una fuerza dentro del stent, y el stent se expande hasta su diametro expandido.
Haciendo referencia en este caso a la figura 2, se muestra un segundo stent que es similar en muchos aspectos al stent mostrado en la figura 1, excepto por el hecho de que los elementos 14 conectores sinusoidales se extienden entre partes 13 extremas que no son solamente adyacentes longitudinalmente, sino que estan separadas entre si hacia arriba o hacia abajo. Nuevamente, la configuraci6n de serpentina esta desfasada.
Haciendo referencia en este caso a la figura 3, se muestra otro stent que comprende elementos 11 estructurales ondulantes similares a los descritos haciendo referencia a las figuras 1 y 2. No obstante, en este stent, los elementos 14 de conexi6n tienen una configuraci6n diferente por el hecho de que las dos curvas 14a y 14b en forma de U son mas cercanas entre si, no siendo la configuraci6n resultante estrictamente "sinusoidal" sino curvilinea.
Tambien es posible usar otras configuraciones curvilineas para los elementos conectores. Por ejemplo, es posible usar configuraciones en espiral como las descritas en la solicitud de patente US 08/846.164, presentada el 25 de abril de 1997, titulada "Improved Stent Configurations Including Spirals".
Haciendo referencia en este caso al stent de la figura 4, puede observarse que este stent tambien es bastante similar al de la figura 1. No obstante, los extremos del stent no son diagonales, como los mostrados en la figura 1, sino que son cuadrados con respecto al eje longitudinal del stent 40.
Haciendo referencia en este caso a la figura 5, se muestra otro stent 50. Nuevamente, los elementos basicos de este stent son similares a los de las realizaciones anteriores, excepto por el hecho de que los elementos 11 helicoidales no tienen solamente una disposici6n en diagonal, sino tambien curvilinea. Esto puede observarse mediante las lineas 18.
Haciendo referencia en este caso al stent mostrado en la figura 6, puede observarse que las ondulaciones del elemento 11 helicoidal pueden estar dispuestas en fase, tal como muestran las lineas 20.
Haciendo referencia en este caso a las figuras 7, 8 y 9, en cada figura se muestra un fragmento de stent 10 que incluye bandas 11 helicoidales. En las figuras 7 y 9, las bandas estan formadas por celdas rectangulares interconectadas y, en la figura 8, las celdas son celdas unidas en forma de serpentina o diamante. En estas figuras, los elementos 14 conectores curvilineos son la configuraci6n sinusoidal preferida.
Los ejemplos y descripci6n anteriores pretenden ser ilustrativos y no exhaustivos. Estos ejemplos y descripci6n sugeriran muchas variaciones y alternativas a un experto ordinario en esta tecnica. Se pretende que todas estas alternativas y variaciones esten incluidas dentro del alcance de las reivindicaciones adjuntas. Aquellos que esten familiarizados con la tecnica pueden reconocer otros equivalentes a las realizaciones especificas descritas en esta memoria, equivalentes que tambien se pretende sean abarcados por las reivindicaciones adjuntas.
A continuaci6n se listan ejemplos de stents:
1. Un stent para implante en una cavidad corporal, teniendo el stent una forma tubular abierta por el extremo, definido por una estructura que comprende:
al menos un elemento de banda helicoidal alargado continuo que comprende partes ondulantes separadas que forman partes de lazo extremas, extendiendose el elemento helicoidal sustancialmente sobre la longitud del cuerpo del stent, y
una pluralidad de elementos curvilineos que se extienden entre y las interconectan al menos algunas de las partes ondulantes adyacentes del elemento helicoidal sobre su longitud
2.
El stent del numero 1, en el que las partes ondulantes tienen un disefo sinusoidal.
3.
El stent del numero 1, en el que los elementos curvilineos se extienden entre los lazos de las partes ondulantes.
4.
El stent del numero 1, en el que los elementos curvilineos incluyen al menos una curva.
5.
El stent del numero 4, en el que la curva tiene forma de U.
6.
El stent del numero 1, en el que los elementos curvilineos incluyen al menos dos curvas.
7.
El stent del numero 6, en el que las curvas tienen forma de U.
8.
El stent del numero 6, en el que las curvas se abren en direcciones sustancialmente opuestas.
9.
El stent del numero 1, en el que las partes ondulantes adyacentes del elemento helicoidal estan en fase.
10.
El stent del numero 1, en el que las partes ondulantes adyacentes del elemento helicoidal estan fuera de fase.
11.
El stent del numero 1, en el que los elementos de interconexi6n se extienden entre las partes de lazo extremas separadas longitudinalmente.
12.
El stent del numero 1, en el que los elementos de interconexi6n se extienden entre partes helicoidales separadas longitudinalmente desde y hacia partes de lazo extremas, que estan separadas diagonalmente unas de otras.
13.
Un stent para implante en una cavidad corporal, teniendo el stent una forma tubular abierta por el extremo definida por una estructura que comprende:
al menos un elemento de banda dispuesta helicoidalmente formando una configuraci6n tubular, estando hecha la banda de una pluralidad de celdas interconectadas cerradas;
una pluralidad de elementos conectores curvilineos que se extienden entre y las interconectan partes de la
banda separadas longitudinalmente sobre su longitud tubular.
14.
El stent del numero 13, en el que las celulas de la banda son rectangulares.
15.
El stent del numero 13, en el que los conectores curvilineos son sinusoidales.

Claims (5)

  1. REIVINDICACIONES
    1. Un stent (10) que comprende:
    al menos un elemento (11) helicoidal alargado continuo, teniendo el al menos un elemento helicoidal alargado continuo partes (12) ondulantes que forman una configuraci6n de serpentina y que se extienden
    5 sustancialmente sobre la longitud del cuerpo del stent, donde las partes ondulantes adyacentes estan fuera de fase; y
    una pluralidad de conectores (14) curvilineos, extendiendose los conectores curvilineos entre y las interconectan al menos algunas de las partes ondulantes adyacentes;
    caracterizado por que
    10 los conectores (14) curvilineos estan unidos a posiciones sobre las partes ondulantes distintas de los extremos terminales de las partes ondulantes.
  2. 2.
    El stent de la reivindicaci6n 1, en el que los conectores (14) incluyen dos curvas.
  3. 3.
    El stent de la reivindicaci6n 1 6 2, que comprende una pluralidad de elementos (11) helicoidales alargados, conectando los conectores curvilineos elementos helicoidales alargados adyacentes.
    15 4. El stent de la reivindicaci6n 3, que comprende dos elementos (11) helicoidales alargados.
  4. 5.
    El stent de una cualquiera de las reivindicaciones 1 a 4, en el que los extremos del stent (10) estan cuadrados.
  5. 6.
    El stent de una cualquiera de las reivindicaciones 1 a 5, en el que el(los) elemento(s) (11) helicoidal(es) alargado(s) esta(n) dispuestos diagonalmente.
    20 7. El stent de una cualquiera de las reivindicaciones 1 a 6, en el que el(los) elemento(s) helicoidal(es) esta(n) dispuestos diagonalmente excepto para los extremos del stent (10) donde el(los) elemento(s) helicoidal(es) esta(n) cuadrados con respecto al eje longitudinal del stent (10).
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EP2119415A1 (en) 2009-11-18
EP1757249B2 (en) 2016-07-20
WO2000024340A1 (en) 2000-05-04
DE69934244D1 (de) 2007-01-11
US20100121430A1 (en) 2010-05-13
CA2347154A1 (en) 2000-05-04
EP2305175B1 (en) 2012-02-08
WO2000024340A9 (en) 2000-11-09
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ATE346566T1 (de) 2006-12-15
US20120136428A1 (en) 2012-05-31
US20050216076A1 (en) 2005-09-29
ES2354996T3 (es) 2011-03-21
ATE482674T1 (de) 2010-10-15
CA2347154C (en) 2008-01-22
US6488703B1 (en) 2002-12-03
US8221490B2 (en) 2012-07-17
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EP1123065A1 (en) 2001-08-16
US6042597A (en) 2000-03-28
ATE544429T1 (de) 2012-02-15
EP1757249A1 (en) 2007-02-28
US20030050690A1 (en) 2003-03-13
US7740654B2 (en) 2010-06-22
EP1757249B1 (en) 2010-11-10
ATE487438T1 (de) 2010-11-15
DE69934244T2 (de) 2007-03-15
US6949120B2 (en) 2005-09-27
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EP2305175A1 (en) 2011-04-06
ES2349851T3 (es) 2011-01-11

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