FR2856585A1 - Cup-shaped hip socket implant has edge rounded over sector of its circumference which includes smooth zone without porous covering - Google Patents

Cup-shaped hip socket implant has edge rounded over sector of its circumference which includes smooth zone without porous covering Download PDF

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Publication number
FR2856585A1
FR2856585A1 FR0307737A FR0307737A FR2856585A1 FR 2856585 A1 FR2856585 A1 FR 2856585A1 FR 0307737 A FR0307737 A FR 0307737A FR 0307737 A FR0307737 A FR 0307737A FR 2856585 A1 FR2856585 A1 FR 2856585A1
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France
Prior art keywords
cup
equatorial
sector
implant according
zone
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Granted
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FR0307737A
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French (fr)
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FR2856585B1 (en
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Jean Louis Dore
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Individual
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Individual
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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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30744—End caps, e.g. for closing an endoprosthetic cavity
    • A—HUMAN NECESSITIES
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    • 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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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4609—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of acetabular cups
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30594—Special structural features of bone or joint prostheses not otherwise provided for slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30688—Means for allowing passage or sliding of tendons or ligaments
    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2002/30906—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth shot- sand- or grit-blasted
    • 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
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
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    • A—HUMAN NECESSITIES
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    • 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
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    • 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
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    • 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
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    • A61F2310/00011—Metals or alloys
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    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

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  • 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 equatorial edge (3) of the cup (1) is rounded over a sector of its circumference, viewed in a cross-sectional plane through the cup axis. Over this sector, along this edge, there is a smooth zone (4) devoid of porous covering. Outside this sector, the edge has pronounced angular form and an equatorial zone (5) with porous covering. The rounded sector extends over the lower front quadrant, or the semi-circumference of the cup edge. A hole (6) in the pole of the cup, is used to mount it on an impact tool. A plug seals the hole, following implantation. The hole is tapped for threads on the plug. It is split between the polar and the equatorial zones. The width of the equatorial zone which is devoid of porous covering, is 5 -15 mm, depending on the cup diameter. The radius of curvature of the rounded edge is 2-10 mm.

Description

La présente invention concerne un implant cotyloïdien de prothèse de hanche.
Un implant cotyloïdien de prothèse de hanche comprend classiquement une cupule délimitant une cavité intérieure, et un insert pouvant être engagé dans cette cavité. La cupule est destinée à être engagée dans la cavité cotyloïdienne et à être fixée au bassin, et l'insert délimite une cavité sphérique destinée à recevoir, avec possibilité d'articulation, la tête sphérique correspondante d'une tige fémorale.
La cupule est généralement en matériau métallique, notamment en titane, et l'insert est en matériau favorisant le glissement de la tête fémorale, notamment en polyéthylène à haute densité ou en alumine.
Il est connu de donner à la cupule une forme extérieure hémisphérique. Cette forme a pour avantage d'améliorer la tenue de l'implant et de permettre un meilleur appui supérieur de l'implant contre l'os. De plus, la cupule étant moins enfoncée dans la cavité cotyloïdienne qu'avec d'autres formes de cupule, la forme hémisphérique permet un meilleur nettoyage de l'os autour du rebord équatorial de la cupule.
Il est également connu, en particulier sur une cupule hémisphérique, d'aménager un revêtement poreux sur la face extérieure de la cupule, les pores de ce revêtement étant destinés à être envahis par les cellules osseuses, permettant ainsi un parfait ancrage de la cupule à l'os.
L'utilisation de tels implants à cupule hémisphérique et revêtement poreux apparaît toutefois générer un problème fréquent et récurent de douleurs ressenties par le patient au niveau de l'articulation lors des mouvements de la hanche.
La présente invention a pour objectif de remédier à cet inconvénient essentiel.
L'implant qu'elle concerne comprend une cupule telle que définie cidessus, ayant une forme sensiblement hémisphérique et comprenant un revêtement poreux sur sa face extérieure.
Selon l'invention, - le rebord équatorial de la cupule présente, sur un secteur de la circonférence de cette cupule, une forme arrondie vue dans un plan contenant par l'axe de la cupule, et - la cupule présente, sur ce même secteur, le long de ce rebord équatorial, une zone lisse, dépourvue de revêtement poreux.
L'inventeur a pu constater que la forme hémisphérique de la cupule, si elle est très adaptée à réaliser un parfait ancrage de l'implant, a en revanche pour inconvénient que le rebord équatorial de la cupule fait, après implantation, plus ou moins saillie au-delà de la paroi osseuse au niveau antérieur de la cavité cotyloïdienne, comme cela apparaît sur la figure 1 ci-jointe. Cette saillie existe particulièrement en cas de paroi antérieure osseuse cotyloïdienne courte, fréquente notamment dans les dysplasies cotyloïdiennes, ou dans les changements de cotyle descellé. Ce rebord forme ainsi une surface vive saillante contre laquelle vient frotter le tendon du muscle psoas au cours du mouvement de la cuisse, causant les douleurs précitées ressenties par le patient au niveau de l'aine.Il en résulte une difficulté pour fléchir la hanche, c'est-à-dire pour faire venir la cuisse près de la poitrine, mouvement fréquent dans la vie de tous les jours, notamment pour monter en voiture, monter sur un lit, monter un escalier. Ces douleurs sont aggravées par la présence du revêtement poreux sur la zone équatoriale de la cupule, lequel est abrasif.
Dans l'implant selon l'invention, la cupule présente un rebord équatorial arrondi et est dépourvue de revêtement poreux sur son secteur susceptible, après implantation, d'être balayé par le tendon du muscle psoas lors des mouvements de la cuisse. Ce secteur est ainsi de préférence lisse, "polytampon". Toute agression ou abrasion de ce tendon est éliminée lors de ces mouvements.
La cupule présente, en dehors de ce secteur, un rebord équatorial formant un angle marqué et une zone équatoriale recouverte de revêtement poreux, permettant de réaliser un ancrage solide de la cupule.
Le secteur précité peut s'étendre au moins au niveau du quadrant inféroantérieur de la cupule, c'est-à-dire, si l'on assimile le bord équatorial de la cupule à un cadran d'horloge, entre 3 heures et 6 heures environ pour une cupule destinée à une hanche droite et entre 6 heures et 9 heures environ pour une cupule destinée à une hanche gauche.
De préférence, toutefois, ce secteur s'étend sur la demi-circonférence inférieure de la cupule, pour éviter d'avoir des cupules destinées à des hanches droites et des cupules destinées à des hanches gauches.
La cupule de l'implant selon l'invention peut comprendre un trou polaire, éventuellement taraudé, permettant son montage sur un outil d'impaction. L'implant peut comprendre un bouchon de fermeture de ce trou polaire après implantation, ce bouchon étant fileté lorsque le trou polaire est taraudé.
La cupule peut en outre être fendue entre sa zone polaire et sa zone équatoriale.
À titre simplement indicatif, - la hauteur de la zone équatoriale dépourvue de revêtement poreux peut aller de 5 à 15 mm, selon le diamètre de la cupule ; - le rayon de génération de l'arrondi du rebord équatorial peut aller de 2 à 10 mm.
De préférence, le revêtement poreux est formé par des particules de titane agglomérées sur la surface extérieure de la cupule, notamment de titane connu sous la référence "T40" ou "porocoat". Ce revêtement peut également simplement être le résultat d'un corindonage ou être constitué par de l'hydroxyapatite de calcium.
L'invention sera bien comprise, et d'autres caractéristiques et avantages de celle-ci apparaîtront, en référence au dessin schématique annexé, représentant, à titre d'exemple non limitatif, une forme de réalisation préférée de la cupule de l'implant qu'elle concerne.
Sur ce dessin, - la figure 2 est une vue en perspective de cette cupule, et - la figure 3 est une vue de côté de la cupule après implantation.
L'implant cotyloïdien selon l'invention comprend une cupule 1 délimitant une cavité intérieure 2, et un insert (non représenté) pouvant être engagé dans cette cavité 2. Comme le montre la figure 2, la cupule 1 est destinée à être engagée dans la cavité cotyloïdienne 100 et à être fixée au bassin 101 du patient.
La cupule 1 est en matériau métallique, notamment en titane, a une forme extérieure sensiblement hémisphérique et est recouverte, sur sa face extérieure, par un revêtement poreux, schématisé par des points. Ce revêtement poreux est notamment formé par des particules de titane connu sous la référence "T40", agglomérées sur la surface extérieure de la cupule 1. Les pores de ce revêtement sont destinés à être envahis par les cellules osseuses, permettant ainsi un parfait ancrage de la cupule 1 au bassin 101.
De manière bien connue, l'insert destiné à être engagé dans la cavité 2 délimite une cavité sphérique destinée à recevoir, avec possibilité d'articulation, la tête sphérique correspondante d'une tige fémorale prothétique. Cet insert est en matériau favorisant le glissement de cette tête fémorale, notamment en polyéthylène à haute densité.
En référence aux figures 2 et 3, il apparaît que le rebord équatorial 3 de la cupule 1 présente, sur un secteur représentant environ la moitié de la circonférence de cette cupule, une forme arrondie vue dans un plan contenant par l'axe de la cupule 1 ; il apparaît également que la cupule 1 présente, sur ce même secteur, le long de ce rebord équatorial 3, une zone lisse 4 dépourvue de revêtement poreux.
Le rebord équatorial 3 forme, en dehors dudit secteur, un angle marqué, et la zone équatoriale 5 de la cupule est, en dehors de ladite zone lisse 4, recouverte de revêtement poreux.
Comme cela apparaît sur la figure 2, la cupule 1 est destinée à être implantée de telle sorte que son secteur précité où le rebord 3 est arrondi et où se trouve la zone lisse 4, se trouve en regard du tendon 102 du muscle psoas. Ce rebord 3 et cette zone 4 confèrent à la cupule 1 une conformation mousse en cet emplacement, permettant d'éliminer toute agression ou abrasion de ce tendon 102 lors des mouvements de la hanche.
L'angle marqué que forme le rebord équatorial 3 en dehors de ce secteur et le revêtement poreux que comprend la zone équatoriale 5 également en dehors de ce secteur, permettent de réaliser un ancrage solide de la cupule, uniquement au moyen de ce revêtement.
L'invention fournit ainsi un implant cotyloïdien de prothèse de hanche permettant de remédier au problème fréquent et récurent de douleurs ressenties par le patient au niveau de l'articulation traitée lors des mouvements de la hanche.
Il va de soi que l'invention n'est pas limitée à la forme de réalisation décrite ci-dessus à titre d'exemple mais qu'elle s'étend à toutes les formes de réalisations couvertes par les revendications ci-annexées.The present invention relates to an acetabulum prosthetic hip implant.
An acetabulum hip prosthesis implant conventionally comprises a cup delimiting an interior cavity, and an insert that can be engaged in this cavity. The cup is intended to be engaged in the acetabular cavity and to be fixed to the pelvis, and the insert delimits a spherical cavity intended to receive, with possibility of articulation, the corresponding spherical head of a femoral stem.
The cup is generally made of metal material, in particular titanium, and the insert is made of a material promoting the sliding of the femoral head, in particular of high density polyethylene or alumina.
It is known to give the cup an outer hemispherical shape. This form has the advantage of improving the strength of the implant and to allow better support of the implant against the bone. In addition, the cup being less recessed in the acetabular cavity than with other cups, the hemispherical shape allows better cleaning of the bone around the equatorial rim of the cup.
It is also known, in particular on a hemispherical cup, to provide a porous coating on the outer face of the cup, the pores of this coating being intended to be invaded by the bone cells, thus allowing a perfect anchoring of the cup to the bone.
The use of such implants with hemispherical cup and porous coating appears, however, to generate a frequent and recurring problem of pain felt by the patient at the level of the joint during the movements of the hip.
The present invention aims to overcome this essential disadvantage.
The implant it concerns comprises a cup as defined above, having a substantially hemispherical shape and comprising a porous coating on its outer face.
According to the invention, the equatorial rim of the cup has, on a sector of the circumference of this cup, a rounded shape seen in a plane containing the axis of the cup, and the cup present on the same sector. , along this equatorial rim, a smooth zone, devoid of porous coating.
The inventor has found that the hemispherical shape of the cup, if it is very suitable for achieving a perfect anchoring of the implant, has the disadvantage that the equatorial edge of the cup is, after implantation, more or less protruding beyond the bone wall at the anterior level of the acetabulum, as shown in Figure 1 attached. This projection exists especially in the case of a short anterior acetabular wall, frequent in particular in acetabular dysplasias, or in unsealed acetabular changes. This rim thus forms a projecting live surface against which the tendon of the psoas muscle rubs during the movement of the thigh, causing the aforementioned pains felt by the patient in the groin. This results in difficulty in flexing the hip, that is to say, to bring the thigh close to the chest, frequent movement in everyday life, including getting in the car, get on a bed, climb a staircase. These pains are aggravated by the presence of the porous coating on the equatorial zone of the cup, which is abrasive.
In the implant according to the invention, the cup has a rounded equatorial rim and is devoid of porous coating on its area likely, after implantation, to be swept by the tendon of the psoas muscle during movements of the thigh. This sector is thus preferably smooth, "polytampon". Any aggression or abrasion of this tendon is eliminated during these movements.
The cup has, outside this sector, an equatorial rim forming a marked angle and an equatorial zone covered with porous coating, to achieve a solid anchoring of the cup.
The aforesaid sector may extend at least at the level of the lower lower quadrant of the cup, that is to say, if we equate the equatorial edge of the cup to a clock face, between 3 hours and 6 hours. approximately for a cup for a right hip and between 6 and 9 hours for a cup for a left hip.
Preferably, however, this sector extends over the lower half-circumference of the cup, to avoid having cups for straight hips and cups for left hips.
The cup of the implant according to the invention may comprise a polar hole, possibly tapped, allowing its mounting on an impaction tool. The implant may comprise a closure cap for this polar hole after implantation, this cap being threaded when the polar hole is tapped.
The cup can also be split between its polar zone and its equatorial zone.
By way of indication, the height of the equatorial zone devoid of a porous coating can range from 5 to 15 mm, depending on the diameter of the cup; the radius of generation of the rounding of the equatorial rim can range from 2 to 10 mm.
Preferably, the porous coating is formed by titanium particles agglomerated on the outer surface of the cup, especially titanium known as "T40" or "porocoat". This coating may also simply be the result of corunduming or consist of calcium hydroxyapatite.
The invention will be better understood, and other features and advantages thereof will become apparent, with reference to the attached schematic drawing, showing, by way of non-limiting example, a preferred embodiment of the cup of the implant which 'it relates to.
In this drawing, - Figure 2 is a perspective view of this cup, and - Figure 3 is a side view of the cup after implantation.
The acetabular implant according to the invention comprises a cup 1 delimiting an internal cavity 2, and an insert (not shown) that can be engaged in this cavity 2. As shown in FIG. 2, the cup 1 is intended to be engaged in the acetabular cavity 100 and to be attached to the patient's pelvis 101.
The cup 1 is made of metallic material, in particular titanium, has a substantially hemispherical outer shape and is covered on its outer face by a porous coating, schematized by dots. This porous coating is formed in particular by particles of titanium known under the reference "T40", agglomerated on the outer surface of the cup 1. The pores of this coating are intended to be invaded by the bone cells, thus allowing a perfect anchoring of cup 1 to basin 101.
In a well known manner, the insert intended to be engaged in the cavity 2 delimits a spherical cavity intended to receive, with possibility of articulation, the corresponding spherical head of a prosthetic femoral stem. This insert is made of a material promoting the sliding of this femoral head, in particular of high density polyethylene.
Referring to Figures 2 and 3, it appears that the equatorial rim 3 of the cup 1 has, on a sector representing about half of the circumference of this cup, a rounded shape seen in a plane containing the axis of the cup 1; it also appears that the cup 1 has, on the same sector, along this equatorial rim 3, a smooth zone 4 devoid of porous coating.
The equatorial rim 3 forms, outside said sector, a marked angle, and the equatorial zone 5 of the cup is, outside said smooth zone 4, covered with a porous coating.
As shown in Figure 2, the cup 1 is intended to be implanted so that its aforementioned sector where the flange 3 is rounded and where is the smooth zone 4, is opposite the tendon 102 of the psoas muscle. This flange 3 and this zone 4 confer on the cup 1 a foam conformation in this location, making it possible to eliminate any aggression or abrasion of this tendon 102 during movements of the hip.
The marked angle formed by the equatorial rim 3 outside this sector and the porous coating that includes the equatorial zone 5 also outside this sector, make it possible to achieve a solid anchoring of the cup, only by means of this coating.
The invention thus provides an acetabulum prosthesis prosthesis implant to overcome the frequent and recurrent pain experienced by the patient in the treated joint during hip movements.
It goes without saying that the invention is not limited to the embodiment described above by way of example but that it extends to all embodiments covered by the appended claims.

REVENDICATIONS
1 - Implant cotyloïdien de prothèse de hanche, comprenant une cupule (1) destinée à être engagée dans une cavité cotyloïdienne (100) et à être fixée au bassin (101) du patient, cette cupule (1) ayant une forme sensiblement hémisphérique et comprenant un revêtement poreux sur sa face extérieure ; implant caractérisé en ce que : - le rebord équatorial (3) de la cupule (1) présente, sur un secteur de la circonférence de cette cupule (1), une forme arrondie vue dans un plan contenant par l'axe de la cupule (1), et - la cupule (1) présente, sur ce même secteur, le long de ce rebord équatorial (3), une zone lisse (4), dépourvue de revêtement poreux. A prosthetic acetabular prosthesis implant comprising a cup (1) intended to be engaged in an acetabular cavity (100) and to be fixed to the pelvis (101) of the patient, this cup (1) having a substantially hemispherical shape and comprising a porous coating on its outer face; implant characterized in that: - the equatorial rim (3) of the cup (1) has, on a sector of the circumference of this cup (1), a rounded shape seen in a plane containing the axis of the cup ( 1), and - the cup (1) has, on the same sector, along this equatorial rim (3), a smooth zone (4), devoid of porous coating.

Claims (2)

2 - Implant cotyloïdien selon la revendication 1, caractérisé en ce que la cupule (1) présente, en dehors dudit secteur, un rebord équatorial (3) formant un angle marqué et une zone équatoriale (5) recouverte de revêtement poreux. 3 - Implant cotyloïdien selon la revendication 1 ou la revendication 2, caractérisé en ce que ledit secteur s'étend au moins au niveau du quadrant inféro-antérieur de la cupule (1). 4 - Implant cotyloïdien selon l'une des revendications 1 à 3, caractérisé en ce que ledit secteur s'étend sur la demi-circonférence inférieure de la cupule (1). 5 - Implant cotyloïdien selon l'une des revendications 1 à 4, caractérisé en ce que sa cupule (1) comprend un trou polaire (6) permettant son montage sur un outil d'impaction. 6 - Implant cotyloïdien selon la revendication 5, caractérisé en ce qu'il comprend un bouchon de fermeture dudit trou polaire après implantation. 7 - Implant cotyloïdien selon la revendication 6, caractérisé en ce que le trou polaire est taraudé et en ce que ledit bouchon de fermeture est fileté. 8 - Implant cotyloïdien selon l'une des revendications 1 à 7, caractérisé en ce que sa cupule est fendue entre sa zone polaire et sa zone équatoriale. 9 - Implant cotyloïdien selon l'une des revendications 1 à 8, caractérisé en ce que- la hauteur de la zone équatoriale dépourvue de revêtement poreux peut aller de 5 à 15 mm, selon le diamètre de la cupule ;2 - cotyloid implant according to claim 1, characterized in that the cup (1) has, outside said sector, an equatorial flange (3) forming a marked angle and an equatorial zone (5) covered with a porous coating. 3 - cotyloid implant according to claim 1 or claim 2, characterized in that said sector extends at least at the level of the inferior anterior quadrant of the cup (1). 4 - cotyloid implant according to one of claims 1 to 3, characterized in that said sector extends over the lower half-circumference of the cup (1). 5 - cotyloid implant according to one of claims 1 to 4, characterized in that its cup (1) comprises a polar hole (6) for mounting on an impaction tool. 6 - cotyloid implant according to claim 5, characterized in that it comprises a closure cap of said polar hole after implantation. 7 - cotyloid implant according to claim 6, characterized in that the polar hole is threaded and in that said closure cap is threaded. 8 - cotyloid implant according to one of claims 1 to 7, characterized in that its cup is split between its polar zone and its equatorial zone. 9 - cotyloid implant according to one of claims 1 to 8, characterized in that- the height of the equatorial zone devoid of porous coating can range from 5 to 15 mm, depending on the diameter of the cup; - le rayon de génération de l'arrondi du rebord équatorial (3) peut aller de 2 à 10 mm.the radius of generation of the rounding of the equatorial flange (3) can range from 2 to 10 mm. 10 - Implant cotyloïdien selon l'une des revendications 1 à 9, caractérisé en ce que ledit revêtement poreux est formé par des particules de titane agglomérées sur la surface extérieure de la cupule (1), notamment de titane connu sous la référence "T40" ou "porocoat", ou être le résultat d'un corindonage, ou encore être constitué par de l'hydroxyapatite de calcium.10 - cotyloid implant according to one of claims 1 to 9, characterized in that said porous coating is formed by titanium particles agglomerated on the outer surface of the cup (1), in particular titanium known under the reference "T40" or "porocoat", or be the result of corunduming, or be constituted by calcium hydroxyapatite.
FR0307737A 2003-06-26 2003-06-26 COTYLOID IMPLANT OF HIP PROSTHESIS Expired - Fee Related FR2856585B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20161662A1 (en) * 2016-03-15 2017-09-15 Adler Ortho S R L COTILOIDEA PROSTHESIS PERFORMED BY ANTHROPROSTHESES.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2551655A1 (en) * 1983-09-09 1985-03-15 Breard Francis Cup for articular prosthesis, in particular for hip prosthesis
FR2630907A1 (en) * 1988-05-03 1989-11-10 Biomecanique Integree Screwed cotyle, in particular for prosthesis of the "hip" type
EP0963740A1 (en) * 1998-06-09 1999-12-15 Merck Biomaterial France Acetabular cup for hip prosthesis
US6503281B1 (en) * 2000-08-25 2003-01-07 Thomas H. Mallory Total hip replacement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2551655A1 (en) * 1983-09-09 1985-03-15 Breard Francis Cup for articular prosthesis, in particular for hip prosthesis
FR2630907A1 (en) * 1988-05-03 1989-11-10 Biomecanique Integree Screwed cotyle, in particular for prosthesis of the "hip" type
EP0963740A1 (en) * 1998-06-09 1999-12-15 Merck Biomaterial France Acetabular cup for hip prosthesis
US6503281B1 (en) * 2000-08-25 2003-01-07 Thomas H. Mallory Total hip replacement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20161662A1 (en) * 2016-03-15 2017-09-15 Adler Ortho S R L COTILOIDEA PROSTHESIS PERFORMED BY ANTHROPROSTHESES.
WO2017157842A1 (en) * 2016-03-15 2017-09-21 Adler Ortho S.R.L. Acetabular prosthesis for hip arthroplasty

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