ES2231413T3 - Cupula cotiloidea para protesis de cadera. - Google Patents

Cupula cotiloidea para protesis de cadera.

Info

Publication number
ES2231413T3
ES2231413T3 ES01403209T ES01403209T ES2231413T3 ES 2231413 T3 ES2231413 T3 ES 2231413T3 ES 01403209 T ES01403209 T ES 01403209T ES 01403209 T ES01403209 T ES 01403209T ES 2231413 T3 ES2231413 T3 ES 2231413T3
Authority
ES
Spain
Prior art keywords
dome
cotyloid
hydroxy
coating
apatite
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.)
Expired - Lifetime
Application number
ES01403209T
Other languages
English (en)
Inventor
Pierre c/o Cabinet Ballot Bouraly
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer Orthopedie S A
SULZER ORTHOPEDIE SA
Original Assignee
Sulzer Orthopedie S A
SULZER ORTHOPEDIE SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sulzer Orthopedie S A, SULZER ORTHOPEDIE SA filed Critical Sulzer Orthopedie S A
Application granted granted Critical
Publication of ES2231413T3 publication Critical patent/ES2231413T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

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    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
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    • A61F2/00Filters 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
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    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
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    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
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    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
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    • A61F2002/30682Means for preventing migration of particles released by the joint, e.g. wear debris or cement particles
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    • A61F2310/00389The prosthesis being coated or covered with a particular material
    • A61F2310/00592Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2430/00Materials or treatment for tissue regeneration
    • A61L2430/24Materials or treatment for tissue regeneration for joint reconstruction

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Abstract

Cúpula cotiloidea destinada a recibir una cabeza esférica de un vástago femoral o humeral, en la que se ha horadado un cierto número de orificios fileteados (2), inicialmente obstruidos mediante tapones (3), y por tornillos de fijación en el cotilo humano antes de la colocación de un inserto interno de materia plástica, caracterizada porque recibe sobre su cara externa (4) un revestimiento de titanio poroso, destinado a asegurar la estanqueidad de la cúpula principalmente al nivel de los orificios (2) no utilizados, que permanecen obstruidos por sus tapones respectivos (3), cuyo revestimiento de titanio poroso constituye una subcapa con un revestimiento de hidroxi-apatita proyectado sucesivamente sobre éste son el fin de favorecer la respuesta ósea.

Description

Cúpula cotiloidea para prótesis de cadera.
La presente invención se refiere a una cúpula cotiloidea para prótesis de la cadera.
Una cúpula de éste tipo está destinada a recibir una cabeza esférica de un vástago femoral, que constituye una prótesis, que coopera con la cúpula que se aloja en la cavidad articular deteriorada.
Previamente a la colocación de la cabeza esférica del vástago femoral, que podría ser, igualmente, un vástago humeral, se coloca en su sitio en la cúpula un inserto de materia plástica biocompatible tal como un polietileno.
Se conoce una cúpula de éste tipo, en la que está horadado un cierto número de orificios fileteados, obturados inicialmente mediante tapones y liberados según las necesidades para ser atravesados por tornillos de fijación en el cotilo humano antes de la colocación en su sitio del inserto interno de materia plástica.
Éste tipo de cúpula, conocido, presenta un buen número de inconvenientes esencialmente debidos a la presencia de los orificios, destinados a los tornillos opcionales, que provocan por desgaste una fluencia del inserto de polietileno en tales orificios. Además, la cúpula cotiloidea, generalmente realizada de metal, provoca una deformación del asiento del inserto y, por lo tanto, a largo plazo la deformación de la articulación protésica.
Además, se escapan micropartículas debidas al rozamiento del inserto sobre la cúpula, a través de los orificios o a través de los intersticios si éstos han recibido tapones fileteados, puesto que la altura de los fileteados o del espesor de la cúpula es obligatoriamente pequeña, con el fin de permitir un cierto espesor de inserto.
Todo esto conduce a decir que la estanqueidad es muy relativa en éste tipo de cúpula conocida.
Para remediar éste problema de estanqueidad, se ha imaginado, en primer lugar, revestir la superficie externa de la cúpula con hidroxi-apatita, puesto que se conoce perfectamente que ésta materia favorece la reposición ósea, véase por ejemplo la publicación EP-A-0900552.
Sin embargo, los ensayos han demostrado que la estanqueidad no se obtenía con éste material puesto que de hecho se trata de un material poroso que tiene un cierto poder de absorción, que se ha puesto de manifiesto por los ensayos citados.
La presente invención tiene, por lo tanto, como objeto remediar éstos inconvenientes y se refiere, a éste efecto, a una cúpula cotiloidea destinada a recibir una cabeza esférica de un vástago femoral o humeral, en la que se ha horadado un cierto número de orificios fileteados inicialmente obstruidos por medio de tapones y por tornillos de fijación en el cotilo humano antes de la colocación de un inserto interno de materia plástica, caracterizada porque recibe sobre su cara externa un revestimiento de titanio poroso destinado a asegurar la estanqueidad de la cúpula principalmente al nivel de los orificios no utilizados, que permanecen obturados por sus tapones respectivos.
La presente invención se refiere, igualmente, a las características que se pondrán de manifiesto en el transcurso de la descripción que sigue, y que deberán considerarse aisladamente o según cualquiera de sus combinaciones técnicas posibles.
Ésta descripción, dada a título de ejemplo no limitativo, hará comprender mejor el modo en que la invención puede realizarse con referencia a los dibujos adjuntos, en los que:
La figura 1 es una vista en planta interior de la cúpula cotiloidea según la invención.
La figura 2 es una vista en sección transversal según la línea II/II de la figura 1.
La figura 3 es una vista en sección transversal según la línea III/III de la figura 1.
La figura 4 es una vista en detalle de la figura 1.
La cúpula cotiloidea 1, designada globalmente en las figuras, está destinada a recibir una cabeza esférica de un vástago femoral o un humeral (no representado) en la que se ha horadado un cierto número de orificios fileteados 2 inicialmente obstruidos por medio de tapones 3 y liberados según las necesidades para ser atravesados por tornillos de fijación (no representados) en el cotilo humano, antes de la colocación de un inserto interno de materia plástica (no representado).
Según la invención, la cúpula recibe sobre su cara externa 4 un revestimiento de titanio poroso destinado a asegurar la estanqueidad de la cúpula 1, principalmente al nivel de los orificios fileteados 2, no utilizados, que permanecen obstruidos por sus tapones respectivos 3.
Preferentemente, el revestimiento de titanio poroso responde a la norma ISO 5832-3 no aleado, con un espesor comprendido entre 5 y 150 micras.
Se trata, de hecho, de un revestimiento de titanio T40 que ha dado resultados particularmente buenos durante los ensayos.
Según otra característica de la invención, el revestimiento de titanio poroso constituye una subcapa con un revestimiento de hidroxi-apatita proyectado sucesivamente sobre éste con el fin de favorecer la reposición ósea.
Se tratará de una hidroxi-apatita que ha dado, igualmente, un excelente resultado durante los ensayos.
El revestimiento de hidroxi-apatita tiene un espesor comprendido entre 20 y 200 micras.
La composición química del revestimiento de hidroxi-apatita es: Ca5(Po4)3OH > 97%.
Las aplicaciones del revestimiento de titanio poroso, a continuación del revestimiento de hidroxi-apatita, se efectúan por proyección por medio de una antorcha de plasma atmosférico.
Según otra característica de la invención, como paso previo al depósito de titanio, después de la hidroxi-apatita sobre la superficie 4 externa de la cúpula 2, las extremidades de los tapones de obstrucción 3, que desembocan en orificios fileteados 2, así como sus cabezas, que desembocan sobre la superficie interna 5 de la citada cúpula 1, se rectifica al mismo tiempo que dichas superficies interna y externa, de manera que las extremidades de los tornillos de dichos tapones 3, así como sus cabezas presenten un estado superficial que se confunda con dichas superficies internas 5 y externa 4 de la cúpula 2, permitiendo llevar a cabo la estanqueidad al nivel de las extremidades de los tapones 3 y evitar la fluencia del material plástico que constituye el inserto interno.
De hecho, los bosquejos de tapones son enrasados una vez atornillados en la cúpula 1 por torneado de las semiesferas interior y exteriormente.
Según otra característica de la invención, la cúpula cotiloidea está dotada en su superficie exterior semiesférica (4) con una pluralidad de aletas cortantes (6), que forman porciones de meridianos distribuidos geométricamente en una zona periférica situada en las proximidades de su parte ecuatorial E, de manera que aseguren la estabilidad primaria en rotación y en basculamiento de dicha cúpula (1).
La estabilidad primaria en rotación y en basculamiento está asegurada, de hecho, por doce aletas cortantes situadas en la parte ecuatorial E.
Otro relieve, como puntas divergentes, o tetones, se opone siempre a una impactación a la fuerza.
Únicamente las aletas colocadas en el sentido axial de compresión pueden ser eficaces en el caso de una cúpula implantada a presión por ajuste.
Éstas tendrán siempre un efecto direccional favorable sobre la colocación a largo plazo.
Si la estabilización primaria no es satisfactoria, los tres orificios 2 permiten una utilización de tornillos de fijación complementaria (no representados).
El anclaje óseo se produce sobre la superficie de contacto externa de la cúpula y sobre las aletas. El revestimiento de hidroxi-apatita tiene como finalidad acelerar ésta reposición ósea. Las aletas son el origen de una osteoformación intensa. Ésta reposición ósea se ha caracterizado por estudios histológicos que son de notoriedad pública.
La cúpula ha sido concebida con un espesor mínimo de metal de 3 mm con el fin de preservar un espesor máximo del inserto de polietileno. El movimiento entre el inserto y la cúpula se ha minimizado debido a que éstos se encuentran en contacto. Igualmente el número de orificios 3, destinados a los tornillos, está limitado con el fin de reducir a largo plazo la fluencia del inserto.

Claims (7)

1. Cúpula cotiloidea destinada a recibir una cabeza esférica de un vástago femoral o humeral, en la que se ha horadado un cierto número de orificios fileteados (2), inicialmente obstruidos mediante tapones (3), y por tornillos de fijación en el cotilo humano antes de la colocación de un inserto interno de materia plástica, caracterizada porque recibe sobre su cara externa (4) un revestimiento de titanio poroso, destinado a asegurar la estanqueidad de la cúpula principalmente al nivel de los orificios (2) no utilizados, que permanecen obstruidos por sus tapones respectivos (3), cuyo revestimiento de titanio poroso constituye una subcapa con un revestimiento de hidroxi-apatita proyectado sucesivamente sobre éste son el fin de favorecer la respuesta ósea.
2. Cúpula cotiloidea según la reivindicación 1, caracterizada porque el revestimiento de titanio poroso responde a la norma ISO 5832-3 no aleado, con un espesor comprendido entre 5 y 150 micras.
3. Cúpula cotiloidea según una de las reivindicaciones 1 ó 2, caracterizada porque el revestimiento de hidroxi-apatita tiene un espesor comprendido entre 20 y 200 micras.
4. Cúpula cotiloidea según una de las reivindicaciones 1 a 3, caracterizada porque la composición química del revestimiento de la hidroxi-apatita es: Ca5 (Po4)3OH>97%.
5. Cúpula cotiloidea según una de las reivindicaciones 1 a 4, caracterizada porque está dotada en su superficie externa semiesférica (4) con una pluralidad de aletas cortantes (6), que forman porciones de meridianos distribuidos simétricamente en una zona periférica situada en la proximidad de su parte ecuatorial E, con el fin de asegurar la estabilidad primaria en rotación y en basculamiento de dicha cúpula (1).
6.- Procedimiento para la fabricación de una cúpula cotiloidea según una de las reivindicaciones 1 a 5, caracterizado porque las aplicaciones de revestimiento de titanio poroso, y a continuación de revestimiento de hidroxi-apatita, se efectúan por proyección por medio de una antorcha de plasma atmosférico.
7. Procedimiento para la fabricación de una cúpula cotiloidea según la reivindicación 6, caracterizado porque como paso previo al depósito del titanio y a continuación de la hidroxi-apatita sobre la superficie (4) externa de la cúpula (2), las extremidades de los tapones de obstrucción (3), que desembocan por los orificios fileteados (2), así como sus cabezas, que desembocan sobre la superficie interna (5) de dicha cúpula (1), se rectifican simultáneamente con dichas superficies interna y externa, de manera que las extremidades de los tornillos de dichos tapones (3), así como sus cabezas, presenten un estado superficial que se confunda con el de dichas superficies interna (5) y externa (4) de la cúpula (2), permitiendo llevar a cabo la estanqueidad al nivel de las extremidades de los tapones (3) y evitar la fluencia del material plástico, que constituye el inserto interno.
ES01403209T 2000-12-14 2001-12-12 Cupula cotiloidea para protesis de cadera. Expired - Lifetime ES2231413T3 (es)

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FR0016534A FR2818118B1 (fr) 2000-12-14 2000-12-14 Cupule cotyloidienne pour prothese de la hanche
FR0016534 2000-12-14

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ES2231413T3 true ES2231413T3 (es) 2005-05-16

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AT (1) ATE281131T1 (es)
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FR (1) FR2818118B1 (es)

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JP4381012B2 (ja) * 2003-03-14 2009-12-09 ヒューレット・パッカード・カンパニー 万物識別子を用いたデータ検索システムおよびデータ検索方法
GB0922339D0 (en) * 2009-12-21 2010-02-03 Mcminn Derek J W Acetabular cup prothesis and introducer thereof
FR2993171B1 (fr) * 2012-07-11 2015-09-04 Rv Finances Cotyle pour prothese de hanche
US10537658B2 (en) 2017-03-28 2020-01-21 DePuy Synthes Products, Inc. Orthopedic implant having a crystalline gallium-containing hydroxyapatite coating and methods for making the same
US10537661B2 (en) 2017-03-28 2020-01-21 DePuy Synthes Products, Inc. Orthopedic implant having a crystalline calcium phosphate coating and methods for making the same

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DE3630276A1 (de) * 1986-09-05 1988-03-17 Gernot Dr Med Felmet Zementfrei implantierbare selbstnachspannende hueftgelenkpfanne
ES2109806T3 (es) * 1993-12-10 1998-01-16 Sulzer Orthopedics Inc Boveda acetabular con agujeros sellados rompibles para tornillos.
US5571198A (en) * 1994-01-21 1996-11-05 David A. Drucker Acetabular shell with selectively available bone screw holds
US5782929A (en) * 1996-12-31 1998-07-21 Sulzer Orthopedics Inc. Acetabular shell having sintered screw hole plugs
DE19755536A1 (de) * 1997-12-13 1999-06-17 Ceramtec Ag Hüftgelenkspfanne
FR2768046B1 (fr) * 1997-09-08 1999-12-17 Tornier Sa Cotyle a bouchons
FR2788685B1 (fr) * 1999-01-22 2001-04-20 Jean Louis Dore Implant cothyloidien
FR2793675B1 (fr) * 1999-05-19 2001-08-17 Ile Octophoron Soc Civ Jeu de tiges femorales

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FR2818118A1 (fr) 2002-06-21
ATE281131T1 (de) 2004-11-15
DE60106848D1 (de) 2004-12-09
DE60106848T2 (de) 2005-10-27

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