FR2856586A1 - Cup-shaped hip joint implant, is divided into rigid zone used for fixation at head of hip cavity and flexible, resilient zone - Google Patents

Cup-shaped hip joint implant, is divided into rigid zone used for fixation at head of hip cavity and flexible, resilient zone Download PDF

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Publication number
FR2856586A1
FR2856586A1 FR0307751A FR0307751A FR2856586A1 FR 2856586 A1 FR2856586 A1 FR 2856586A1 FR 0307751 A FR0307751 A FR 0307751A FR 0307751 A FR0307751 A FR 0307751A FR 2856586 A1 FR2856586 A1 FR 2856586A1
Authority
FR
France
Prior art keywords
cup
zone
rigid
implant according
core
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
Application number
FR0307751A
Other languages
French (fr)
Other versions
FR2856586B1 (en
Inventor
Bernard Marandat
Zaven Gabriellian
Filip Mertens
Frederic Michel
Antoine Hage
Thierry Heckel
Alain Ramirez
Jean Louis Prudhon
Francois Steffann
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.)
3 S ORTHO
MERTENS FILIPS
Original Assignee
3 S ORTHO
MERTENS FILIPS
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Filing date
Publication date
Application filed by 3 S ORTHO, MERTENS FILIPS filed Critical 3 S ORTHO
Priority to FR0307751A priority Critical patent/FR2856586B1/en
Publication of FR2856586A1 publication Critical patent/FR2856586A1/en
Application granted granted Critical
Publication of FR2856586B1 publication Critical patent/FR2856586B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

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    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
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    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
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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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0026—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in surface structures
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The cup (1) is divided into two zones. The rigid zone (A) is impacted into the hip bone cavity, and situated at its head. The zone (B) which is flexible, resilient and deformable following impaction between the front and rear bony projections. Only the rigid has provision for fixation into the cavity. Two radial slots (1b, 1c) commence at the circular edge of the cup. They converge towards a central angle of 100-130[deg] in the polar zone, to delimit the flexible zone. The angle is preferably about 110[deg]. The slot width is set to about 0.5-1 mm, to control elasticity. Each slot terminates in a formation resembling a water droplet. The rigid zone has holes to engage screw fastenings. Edge ridges (1h) preventing release cooperate with the locked and adjusted, screwed fitting. An edge lip (2b) of the core (2) fits a groove in the cup. The groove has anti-rotation projections (1k) which locate in the thickness of the core during impaction.

Description

L'invention se rattache au secteur technique des implants du type cotyloïdien pour l'articulation de la hanche.
D'une manière parfaitement connue pour un homme du métier, un implant cotyloïdien comprend une cupule métallique, de forme générale hémisphérique, destinée à recevoir un insert ou noyau pour le montage avec capacité d'articulation d'une tête fémorale que présente un implant complémentaire. La cupule métallique est impactée dans la cavité cotyloïdienne de l'os iliaque en y étant maintenue par différents moyens. Par exemple, la fixation de la cupule peut être au moyen d'un ajustage serré.
La cupule présente différents types d'agencements pour sa fixation dans la cavité cotyloïdienne, et différents agencements pour la fixation du noyau.
Selon le type d'artroplastie à traiter, le noyau est monté dans la cavité interne hémisphérique de la cupule, soit d'une manière fixe, soit d'une manière mobile. Le noyau est généralement en polyéthylène, sans pour cela exclure d'autres matériaux : céramique, métal, ...
On distingue par ailleurs les cupules totalement rigides et les cupules présentant une certaine élasticité. Plus généralement, l'élasticité est obtenue au moyen de fentes radiales, formées à partir du bord supérieur circulaire de la cupule et convergeant en direction de la zone polaire de cette dernière.
Il est connu que physiologiquement, le cotyle osseux se déforme lors de la marche. Cette déformation est située uniquement dans la partie inférieure, c'est-à-dire entre les cornes, puisqu'en effet ces dernières s'écartent et se rapprochent lorsque des efforts sont appliqués au centre du cotyle. La zone supérieure du cotyle est, par contre, très rigide.
Toutefois, même dans le cas d'une cupule présentant des fentes pour constituer des zones déformables par élasticité, cette dernière ne respecte pas l'anatomie, étant donné que ces zones présentent des moyens d'ancrage.
L'invention s'est fixée pour but de remédier à ces inconvénients, de manière simple, sûre, efficace et rationnelle.
Le problème que se propose de résoudre l'invention, dans le cas d'une cupule métallique impactée sans ciment, est de respecter l'anatomie notamment entre les cornes antérieure et postérieure qui constitue la zone physiologique se déformant lors de la marche.
Pour résoudre un tel problème, il a été conçu et mis au point un implant cotyloïdien dont la cupule présente des agencements aptes à créer : - une zone rigide située, après impaction dans la cavité cotyloïdienne de l'os iliaque, au niveau du toit acétabulaire ; - une zone souple apte à être déformée par élasticité située, après impaction, sensiblement entre les cornes antérieure et postérieure ; - seule la zone rigide présente des moyens de fixation dans la cavité cotyloïdienne.
Pour résoudre le problème posé d'assurer une déformation par élasticité d'une zone délimitée de la cupule, les agencements sont constitués par deux fentes radiales formées à partir du bord circulaire de la cupule et convergeant en direction de la zone polaire de ladite cupule selon un angle au centre compris entre 100 et 130[deg] environ afin de délimiter la zone souple.
Avantageusement, l'angle au centre est préférentiellement de 110[deg] environ. La largeur de chaque fente est déterminée pour contrôler l'élasticité et est comprise entre 0,5 et 1 mm environ.
Pour résoudre le problème connu d'éviter le phénomène de concentration des contraintes, chaque fente se termine par une zone rayonnée, notamment en forme de goutte d'eau.
Pour résoudre le problème posé d'assurer la fixation de l'ensemble de la cupule de la cavité cotyloïdienne dans l'os iliaque, la zone rigide présente des trous pour l'engagement des moyens de fixation sous forme de vis notamment. L'ensemble de la cupule présente, à partir de son bord circulaire, une série de nervures agencées en anti-retour pour obtenir une fixation du type ajustage serré dans la partie rigide de la cavité cotyloïdienne.
Dans le cas où la cupule reçoit un noyau fixe, ce dernier présente, au niveau de son bord circulaire, une lèvre apte à coopérer avec une gorge que présente la cupule. La fixation est principalement assurée par la rigidité de la zone non élastique.
Pour résoudre le problème posé de l'indexation angulaire du noyau dans la cavité hémisphérique de la cupule, la gorge présente des aspérités anti-rotatoires qui se logent dans l'épaisseur du noyau au moment de son impaction, ledit noyau étant en polyéthylène.
L'invention est exposée ci-après plus en détail à l'aide des figures des dessins annexés dans lesquels : - la figure 1 est une vue en perspective de la cupule montrant l'extérieur de cette dernière ; - la figure 2 est une vue en perspective de la cupule montrant l'intérieur de cette dernière ; - la figure 3 est une vue de dessus de la cupule ; - la figure 4 est une vue de côté correspondant à la figure 3 ; - les figures 5 et 6 sont des vues en perspective d'un exemple de réalisation nullement limitatif du noyau ; - la figure 7 est une vue de dessus du noyau ; - la figure 8 est une vue de côté correspondant à la figure 7 ; - la figure 9 montre schématiquement l'impaction de la cupule dans la cavité cotyloïdienne de l'os iliaque compte tenu des caractéristiques à la base de l'invention.
Comme le montrent les figures des dessins, d'une manière parfaitement connue pour un homme du métier, la cupule désignée dans son ensemble par (1) est de forme générale hémisphérique et présente une cavité interne (la) également hémisphérique.
Selon l'invention, la cupule (1) est agencée pour former deux zones distinctes, à savoir une zone rigide (A) et une zone souple (B) apte à être déformée par élasticité. Dans ce but, la cupule (1) présente deux fentes radiales (1b) et (le) formées à partir du bord circulaire (le) de la cupule. Les fentes (1b) et (le) convergent en direction de la zone polaire (If) de la cupule. Les fentes (1 b) et (le) délimitent un angle au centre a compris entre 100 et 130[deg] environ afin de limiter la zone souple (B). Avantageusement, l'angle a est de 110[deg] environ.
La largeur de chaque fente (1b) et (le) est déterminée pour contrôler l'élasticité de la zone (B). Cette largeur est comprise entre 0,5 et 1 mm environ. Chaque fente (1b) et (le) se termine par une zone rayonnée (Ibl) et (Ici) profilée en forme de goutte d'eau pour éviter le phénomène de concentration des contraintes dans le métal.
Après impaction (figure 9) de la cupule (1) dans la cavité cotyloïdienne de l'os iliaque, la zone rigide (A) est située au niveau du toit acétabulaire, tandis que la zone souple (B), apte à être déformée par élasticité, est située sensiblement entre les cornes antérieure et postérieure qui correspond à une zone physiologique se déformant lors de la marche. Pour respecter ce phénomène anatomique et permettre à la zone (B) une certaine déformation par élasticité, les moyens de fixation de la cupule sont situés exclusivement dans la zone rigide (A).
Par exemple, cette zone rigide (A) présente des trous (lg) (trois dans l'exemple des dessins) pour l'engagement de vis de fixation, non représentés, de tout type connu et approprié. En outre, l'ensemble de la cupule (1) présente, à partir de son bord circulaire (le), une série de nervures (1h) disposées en anti-retour pour obtenir une fixation du type ajustage serré de la partie rigide de la cavité cotyloïdienne. Ces nervures (1h) sont combinées, dans la zone rigide (A) uniquement, avec des aspérités (li) faisant office d'ailerons.
Le noyau (2), avantageusement en polyéthylène, peut présenter, d'une manière parfaitement connue pour un homme du métier, un rebord (2a) faisant office de casquette. Le noyau (2) présente, au niveau de son bord circulaire, une lèvre (2b) apte à coopérer avec une gorge interne (lj) formée à proximité de l'ouverture de la cavité interne (la) de la cupule ( 1 ). Par ailleurs, cette gorge peut présenter des aspérités (lk) anti-rotatoires pour se loger dans l'épaisseur du noyau (2) au moment de son impaction.
A titre indicatif, la cupule métallique (1) peut être en titane présentant ou non un revêtement externe ré-habitable.
Les avantages ressortent bien de la description, en particulier on souligne et on rappelle : le respect de l'anatomie par les agencements de la cupule délimitant une zone entièrement libre apte à être déformée par élasticité pour respecter la zone physiologique située entre les cornes antérieure et postérieure, lesquelles zones se déforment lors de la marche, tandis que la zone rigide assure toutes les fonctions de fixation et de transmission des contraintes de la tête via l'insert, la cupule et les vis vers l'os iliaque.The invention relates to the technical sector of implants of the acetabular type for the hip joint.
In a manner perfectly known to a person skilled in the art, an acetabular implant comprises a metal cup, of generally hemispherical shape, intended to receive an insert or core for mounting with articulation capacity of a femoral head presented by a complementary implant. . The metal cup is impacted in the acetabular cavity of the iliac bone by being held there by various means. For example, the attachment of the cup can be by means of a tight fit.
The cup has different types of arrangements for its fixation in the acetabular cavity, and different arrangements for the fixation of the nucleus.
Depending on the type of atroplasty to be treated, the nucleus is mounted in the internal hemispherical cavity of the cup, either fixedly or movably. The core is generally made of polyethylene, without excluding other materials: ceramic, metal, ...
There are also completely rigid cups and cups with a certain elasticity. More generally, the elasticity is obtained by means of radial slits, formed from the circular upper edge of the cup and converging in the direction of the polar zone of the latter.
It is known that physiologically, the osseous cup deforms during walking. This deformation is located only in the lower part, that is to say between the horns, since in fact the latter move apart and come closer when forces are applied to the center of the acetabulum. The upper zone of the acetabulum, on the other hand, is very rigid.
However, even in the case of a cup having slots to form elastic-deformable zones, the latter does not respect the anatomy, since these zones have anchoring means.
The object of the invention is to remedy these drawbacks in a simple, safe, efficient and rational manner.
The problem which the invention proposes to solve, in the case of an impacted metal cup without cement, is to respect the anatomy, in particular between the anterior and posterior horns which constitutes the physiological zone deforming during walking.
To solve such a problem, an acetabular implant was designed and developed, the cup of which has arrangements capable of creating: - a rigid zone located, after impaction in the acetabular cavity of the iliac bone, at the level of the acetabular roof ; - A flexible zone capable of being deformed by elasticity situated, after impaction, substantially between the anterior and posterior horns; - Only the rigid zone has fixing means in the acetabular cavity.
To solve the problem posed of ensuring elastic deformation of a delimited zone of the cup, the arrangements consist of two radial slots formed from the circular edge of the cup and converging in the direction of the polar zone of said cup according to an angle at the center of between 100 and 130 [deg] approximately in order to delimit the flexible zone.
Advantageously, the angle at the center is preferably around 110 [deg]. The width of each slot is determined to control the elasticity and is between approximately 0.5 and 1 mm.
To solve the known problem of avoiding the phenomenon of stress concentration, each slot ends in a radiated area, in particular in the form of a drop of water.
To resolve the problem posed of securing the entire cup of the acetabular cavity in the iliac bone, the rigid zone has holes for the engagement of the fixing means in the form of screws in particular. The whole of the cup has, from its circular edge, a series of ribs arranged in a non-return way to obtain a fixing of the tight fitting type in the rigid part of the acetabular cavity.
In the case where the cup receives a fixed core, the latter has, at its circular edge, a lip capable of cooperating with a groove presented by the cup. The fixation is mainly ensured by the rigidity of the non-elastic zone.
To solve the problem of angular indexing of the core in the hemispherical cavity of the cup, the groove has anti-rotational asperities which are housed in the thickness of the core at the time of its impaction, said core being made of polyethylene.
The invention is set out below in more detail with the aid of the figures of the appended drawings in which: - Figure 1 is a perspective view of the cup showing the outside of the latter; - Figure 2 is a perspective view of the cup showing the interior of the latter; - Figure 3 is a top view of the cup; - Figure 4 is a side view corresponding to Figure 3; - Figures 5 and 6 are perspective views of an exemplary embodiment in no way limiting the core; - Figure 7 is a top view of the core; - Figure 8 is a side view corresponding to Figure 7; - Figure 9 schematically shows the impact of the cup in the acetabular cavity of the iliac bone taking into account the characteristics underlying the invention.
As shown in the figures of the drawings, in a manner perfectly known to a person skilled in the art, the cup designated as a whole by (1) is of general hemispherical shape and has an internal cavity (la) also hemispherical.
According to the invention, the cup (1) is arranged to form two distinct zones, namely a rigid zone (A) and a flexible zone (B) capable of being deformed by elasticity. For this purpose, the cup (1) has two radial slots (1b) and (le) formed from the circular edge (le) of the cup. The slits (1b) and (le) converge in the direction of the polar zone (If) of the cup. The slots (1b) and (le) define an angle at the center of between 100 and 130 [deg] approximately in order to limit the flexible zone (B). Advantageously, the angle a is approximately 110 [deg].
The width of each slit (1b) and (le) is determined to control the elasticity of the area (B). This width is between approximately 0.5 and 1 mm. Each slot (1b) and (le) ends in a radiated area (Ibl) and (Here) profiled in the form of a drop of water to avoid the phenomenon of concentration of stresses in the metal.
After impaction (figure 9) of the cup (1) in the acetabular cavity of the iliac bone, the rigid zone (A) is located at the level of the acetabular roof, while the flexible zone (B), capable of being deformed by elasticity, is located appreciably between the anterior and posterior horns which corresponds to a physiological zone deforming during walking. To respect this anatomical phenomenon and allow the area (B) a certain deformation by elasticity, the means for fixing the cup are located exclusively in the rigid area (A).
For example, this rigid zone (A) has holes (lg) (three in the example of the drawings) for the engagement of fixing screws, not shown, of any known and appropriate type. In addition, the whole of the cup (1) has, from its circular edge (the), a series of ribs (1h) arranged in a non-return way to obtain a fixing of the tight fitting type of the rigid part of the acetabular cavity. These ribs (1h) are combined, in the rigid zone (A) only, with asperities (li) acting as fins.
The core (2), advantageously made of polyethylene, may have, in a manner perfectly known to a person skilled in the art, a flange (2a) acting as a cap. The core (2) has, at its circular edge, a lip (2b) capable of cooperating with an internal groove (lj) formed near the opening of the internal cavity (la) of the cup (1). In addition, this groove can have anti-rotational roughness (lk) to accommodate the thickness of the core (2) at the time of its impaction.
As an indication, the metal cup (1) may be made of titanium with or without a re-habitable external coating.
The advantages emerge clearly from the description, in particular it is emphasized and recalled: respect for the anatomy by the arrangements of the cup delimiting an entirely free zone capable of being deformed by elasticity in order to respect the physiological zone situated between the anterior horns and posterior, which zones deform during walking, while the rigid zone provides all the functions of fixation and transmission of stresses from the head via the insert, the cup and the screws to the iliac bone.

REVENDICATIONS
-1- Implant cotyloïdien comprenant un anneau ou cupule métallique (1) de forme générale hémisphérique recevant un noyau ou insert (2) pour la libre articulation d'une tête fémorale de prothèse de hanche, caractérisé en ce que la cupule (1) présente des agencements aptes à délimiter deux zones distinctes à savoir : - une zone rigide (A) située, après impaction dans la cavité cotyloïdienne de l'os iliaque, au niveau du toit acétabulaire ; - une zone souple (B) apte à être déformée par élasticité située, après impaction, sensiblement entre les cornes antérieure et postérieure ; - seule la zone rigide (A) présente des moyens de fixation dans la cavité cotyloïdienne. -1- Cotyloid implant comprising a metal ring or cup (1) of generally hemispherical shape receiving a core or insert (2) for the free articulation of a femoral head of hip prosthesis, characterized in that the cup (1) has arrangements capable of delimiting two distinct zones, namely: - a rigid zone (A) situated, after impaction in the acetabular cavity of the iliac bone, at the level of the acetabular roof; - a flexible zone (B) capable of being deformed by elasticity situated, after impaction, substantially between the anterior and posterior horns; - Only the rigid zone (A) has fixing means in the acetabular cavity.

Claims (1)

-2- Implant cotyloïdien selon la revendication 1, caractérisé en ce que les agencements sont constitués par deux fentes radiales (1b) et (le) formées à partir du bord circulaire de la cupule et convergeant en direction de la zone polaire de ladite cupule selon un angle au centre compris entre 100 et 130[deg] environ afin de délimiter la zone souple (B).-2- acetabular implant according to claim 1, characterized in that the arrangements consist of two radial slots (1b) and (le) formed from the circular edge of the cup and converging towards the polar area of said cup according to an angle at the center of between 100 and 130 [deg] approximately in order to delimit the flexible zone (B). -3- Implant cotyloïdien selon la revendication 2, caractérisé en ce que l'angle au centre est préférentiellement de 110[deg] environ.-3- Cotyloid implant according to claim 2, characterized in that the center angle is preferably approximately 110 [deg]. -4- Implant cotyloïdien selon la revendication 2, caractérisé en ce que la largeur des fentes (1b) et (le) est déterminée pour contrôler l'élasticité et est comprise entre 0,5 et 1 mm environ.-4- Cotyloid implant according to claim 2, characterized in that the width of the slots (1b) and (le) is determined to control the elasticity and is between 0.5 and 1 mm approximately. -5- Implant cotyloïdien selon la revendication 2, caractérisé en ce que chaque fente (1b) et (le) se termine par une zone rayonnée, notamment en forme de goutte d'eau.-5- Cotyloid implant according to claim 2, characterized in that each slot (1b) and (the) ends in a radiated area, in particular in the form of a drop of water. -6- Implant cotyloïdien selon la revendication 1, caractérisé en ce que la zone rigide (A) présente des trous (lg) pour l'engagement des moyens de fixation sous forme de vis notamment.-6- Cotyloid implant according to claim 1, characterized in that the rigid zone (A) has holes (lg) for the engagement of the fixing means in the form of screws in particular. -7- Implant cotyloïdien selon la revendication 1, caractérisé en ce que l'ensemble de la cupule (1) présente, à partir de son bord circulaire, une série de nervures (1h) agencées en anti-retour pour obtenir une fixation du type ajustage serré dans la partie rigide de la cavité cotyloïdienne.-7- Cotyloid implant according to claim 1, characterized in that the whole of the cup (1) has, from its circular edge, a series of ribs (1h) arranged in non-return way to obtain a type of fixation tight fitting in the rigid part of the acetabulum. -8- Implant cotyloïdien selon la revendication 1, caractérisé en ce que le noyau (2) présente, au niveau de son bord circulaire, une lèvre (2b) apte à coopérer avec une gorge (1j) que présente la cupule (1).-8- Cotyloid implant according to claim 1, characterized in that the core (2) has, at its circular edge, a lip (2b) capable of cooperating with a groove (1j) that has the cup (1). -9- Implant cotyloïdien selon la revendication 8, caractérisé en ce que la gorge (1j) présente des aspérités anti-rotatoires (lk) qui se logent dans l'épaisseur du noyau (2) au moment de son impaction, ledit noyau (2) étant en polyéthylène.-9- Cotyloid implant according to claim 8, characterized in that the groove (1j) has anti-rotational roughness (lk) which are housed in the thickness of the core (2) at the time of its impaction, said core (2 ) being made of polyethylene.
FR0307751A 2003-06-24 2003-06-24 COTYLOID IMPLANT Expired - Fee Related FR2856586B1 (en)

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FR2682588A1 (en) * 1991-10-22 1993-04-23 Lepine Groupe Acetabular implant
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FR2781364A1 (en) * 1998-07-24 2000-01-28 Michel Henry Fessy Cup for hip prosthesis has temporary replacement ball to allow positioning of cup
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EP0640326A1 (en) * 1993-08-30 1995-03-01 SULZER Medizinaltechnik AG Element for temporarily increasing the rigidity of a prosthesis
FR2720625A1 (en) * 1994-06-03 1995-12-08 Provis Sa Cotyloid implant for femoral prosthesis
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FR2781364A1 (en) * 1998-07-24 2000-01-28 Michel Henry Fessy Cup for hip prosthesis has temporary replacement ball to allow positioning of cup
WO2002064066A2 (en) * 2001-02-14 2002-08-22 Staeubli Hans Ulrich Implantable socket for a hip joint endoprosthesis

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