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FR2617706A1 - Hip prosthesis with adjustment strut having a frustoconical part inserted into a complementary cavity of the rod - Google Patents

Hip prosthesis with adjustment strut having a frustoconical part inserted into a complementary cavity of the rod Download PDF

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Publication number
FR2617706A1
FR2617706A1 FR8709673A FR8709673A FR2617706A1 FR 2617706 A1 FR2617706 A1 FR 2617706A1 FR 8709673 A FR8709673 A FR 8709673A FR 8709673 A FR8709673 A FR 8709673A FR 2617706 A1 FR2617706 A1 FR 2617706A1
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France
Prior art keywords
head
frustoconical
rod
ceramic
cavity
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Granted
Application number
FR8709673A
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French (fr)
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FR2617706B1 (en
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Individual
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Individual
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Priority to FR8709673A priority Critical patent/FR2617706B1/en
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Classifications

    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • 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
    • A61F2002/30316—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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • A61F2002/30339—Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
    • 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
    • A61F2002/30316—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
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • 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
    • A61F2002/30316—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
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3652—Connections of necks to shafts
    • 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

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

Hip prosthesis comprising a head in the shape of a spherical cap 1, made of ceramic, metal or metal coated with ceramic, and a rod, advantageously a metal rod, comprising an end for linkage with the head, characterised in that the said linkage end 2 comprises a frustoconical cavity, and in that the head and the rod are joined together by means of intermediate struts 4 of variable height, advantageously made of metal, comprising a solid frustoconical part complementary with the said cavity.

Description

PROTHESE DE HANCHE A ENTRETOISE DE REGLAGE AYANT UNE PARTIE
TRONCONIQUE EMMANCHEE DANS UNE CAVITE COMPLEMENTAIRE DE LA
TIGE.HIP PROSTHESIS WITH ADJUSTMENT SPACER HAVING A PART
TRONCONIC CONNECTED IN A COMPLEMENTARY CAVITY OF THE
STEM.

Les prothèses de hanche comprennent une tige, avantageusement en titane, solidarisée au fémur à une extrémité et à l'autre extrémité de laquelle est montée une tête en forme de calotte sphérique avantageusement en céramique.The hip prostheses comprise a rod, advantageously made of titanium, secured to the femur at one end and at the other end of which is mounted a head in the form of a spherical cap, advantageously made of ceramic.

Cette tête est destinée à coopérer avec la cavité cotyloldienne, soit directement, soit par un cotyle en polyéthylène et le chirurgien, après avoir mis en place une extrémité de la tige dans le fémur convenablement préparé à cet effet, doit monter la tête à l'autre extrémité en s'arrangeant pour que la distance qui sépare le sommet de la tête de la base de la partie de liaison de la tige appelée "col" (partie non engagée dans le fémur) corresponde à celle qui sépare le fémur du patient du fond de la cavité cotyloldienne; Autrement dit, le chirurgien doit pouvoir choisir la prothèse fémorale de longueur de col conv#enable, ce qui donne un avantage de disponibilité aux ensembles de partie fémorale réalisés en plusieurs pièces et non en une seule.This head is intended to cooperate with the acetabular cavity, either directly, or by a polyethylene acetabulum and the surgeon, after having put one end of the rod into the femur suitably prepared for this purpose, must mount the head to the other end by arranging so that the distance from the top of the head to the base of the connecting part of the rod called "neck" (part not engaged in the femur) corresponds to that which separates the patient's femur from bottom of the acetabulum; In other words, the surgeon must be able to choose the femoral prosthesis of neck length conv # enable, which gives an advantage of availability to the sets of femoral part carried out in several parts and not in only one.

Le simple emmanchement de la tête, munie d'une cavité tronconique, sur une extrémité tronconique de la tige ne permet de faire varier cette distance qu'en prévoyant d'utiliser un nombre limité de têtes, par exempletrois. Avec cette méthode, les possibilités de réglage sont limitées. En effet, pour la longueur de col maximale, la partie tronconique de la tête céramique en prise sur l'extrémité de la tige doit conserver une portée suffisante. A l'oppose, pour le col de longueur minimale, la cavité tronconique a nécessairement une plus grande profondeur, ce qui réduit notablement la tenue de la tête céramique aux efforts dus à l'effet de coin, engendré par l'emmanchement de type tronconique et susceptible de provoquer l'éclatement de la tête.The simple fitting of the head, provided with a frustoconical cavity, on a frustoconical end of the rod only allows this distance to be varied by planning to use a limited number of heads, for example three. With this method, the setting possibilities are limited. Indeed, for the maximum neck length, the frustoconical part of the ceramic head engaged on the end of the rod must maintain a sufficient range. In contrast, for the neck of minimum length, the frustoconical cavity necessarily has a greater depth, which significantly reduces the resistance of the ceramic head to the forces due to the wedge effect, generated by the frustoconical fitting and likely to cause the head to burst.

Selon le brevet français No 85 05537, on prévoit, pour pallier cet inconvénient, d'emmancher sur l'extrémité tronconique de la tige un manchon métallique intermédiaire qui sera partiellement engagé dans le logement alors cylindrique de la tête et solidarisé à celle-ci, avantageusement par brasure. L'effort d'éclatement est en principe reporté sur ce manchon plus résistant que la céramique.According to French patent No 85 05537, it is provided, to overcome this drawback, to fit on the frustoconical end of the rod an intermediate metal sleeve which will be partially engaged in the housing then cylindrical of the head and secured to it, advantageously by soldering. The bursting force is in principle transferred to this sleeve which is more resistant than ceramic.

Cette solution, qui permet, en conférant aux manchons plusieurs longueurs différentes, d'utiliser une tête unique, ne donne toutefois pas entière satisfaction dans le cas, en pratique fréquent, où la tête est de faible diamètre et où le manchon pénètre profondément à l'intérieur de la tête céramique, sur les modèles dits "à col court". Compte tenu du fait qu'une portion importante de la partie tronconique de la tige reste encore à l'intérieur de la tête, une partie des efforts d'éclatement peut toujours lui être transmise.This solution, which allows, by giving the sleeves several different lengths, to use a single head, is not entirely satisfactory in the case, in frequent practice, where the head is of small diameter and where the sleeve penetrates deeply into the inside the ceramic head, on the so-called "short neck" models. Given the fact that a large portion of the frustoconical part of the rod still remains inside the head, part of the bursting forces can still be transmitted to it.

On est, dans ce cas, très tributaire de l'opération technique de brasage qui, par ailleurs, a l'inconvénient de devoir utiliser, pour une raison de bio-compatibilité, une brasure à haute température, risquant ainsi de fragiliser la tête, du fait des dilatations différentielles de la céramique qui la constitue par rapport au titane qui constitue le manchon.In this case, we are very dependent on the technical brazing operation which, moreover, has the disadvantage of having to use, for a reason of bio-compatibility, high temperature brazing, thus risking weakening the head, due to the differential expansions of the ceramic which constitutes it compared to the titanium which constitutes the sleeve.

L'invention a pour but de supprimer cet inconvénient en faisant comporter à l'extrémité de liaison de la tige une cavité tronconique et en reliant la tête et la tige au moyen d'entretoises intermédiaires comportant, du côté tige, une partie tronconique pleine complémentaire de ladite cavité.The object of the invention is to eliminate this drawback by making the frustoconical end of the rod comprise a frustoconical cavity and by connecting the head and the rod by means of intermediate spacers comprising, on the rod side, a complementary full frustoconical part of said cavity.

Comme on le verra ci-après, l'invention n'est pas limitée à l'utilisation de têtes céramiques massives, quel que soit le diamètre choisi ; elle permet également l'utilisation de têtes métalliques, en particulier celles qui sont revêtues d'une couche de céramique, destinée à en améliorer le contact avec le cotyle et sont obtenues, par exemple, par projection à l'aide d'un chalumeau à plasma.As will be seen below, the invention is not limited to the use of solid ceramic heads, whatever the diameter chosen; it also allows the use of metal heads, in particular those which are coated with a ceramic layer, intended to improve the contact with the acetabulum and are obtained, for example, by projection using a blowtorch. plasma.

L'invention peut aussi s'appliquer à des têtes obtenues par assemblage fixe (collage, brasage ...) ramenant alors à des ensembles à deux pièces et ré-introduisant de la sorte l'inconvénient attaché aux têtes pré-asse#mblées. Pour ce qui concerne la réalisation brasée, le montage selon l'invention permet de choisir le dimensionnement optimal de la partie cylindrique pénétrant dans la tête, sur laquelle ne s 'exer- cent plus, cette fois, les efforts d'éclatement dus à l'emmanchement tronconique.The invention can also be applied to heads obtained by fixed assembly (bonding, brazing, etc.) then reducing to two-piece assemblies and thus re-introducing the drawback attached to pre-assembled heads # mblées. With regard to the brazed embodiment, the assembly according to the invention makes it possible to choose the optimal dimensioning of the cylindrical part penetrating into the head, on which this time no longer exerts the bursting forces due to the '' frustoconical fitting.

Selon un mode d'exécution préféré, l'entretoise comporte une deuxième partie tronconique pleine symétrique de la première qui s'emmanche dans une cavité tronconique de la tête.According to a preferred embodiment, the spacer comprises a second frustoconical full part symmetrical with the first which is fitted into a frustoconical cavity of the head.

Selon une variante, l'entretoise comporte une coupelle formant un réceptacle tronconique pour une partie tronconique pleine de la tête.Alternatively, the spacer includes a cup forming a frustoconical receptacle for a full frustoconical part of the head.

L'invention sera mieux comprise à l'aide de la description ci-après.-
Au dessin annexé :
Les figures 1 à 3 illustrent le mode d'exécution
préféré, avec des entretoises biconiques ayant des
collets médians de hauteurs différentes ; et
Les figures 4 à 6 illustrent la variante, avec des
coupelles d'entretoises ayant différentes épaisseurs
de fond.The invention will be better understood using the description below.
In the attached drawing:
Figures 1 to 3 illustrate the mode of execution
preferred, with biconical spacers having
middle collars of different heights; and
Figures 4 to 6 illustrate the variant, with
spacer cups with different thicknesses
background.

Aux figures 1 à 3, on voit qu'une même tête 1 réalisée en céramique, en métal ou en métal revêtu d'une céramique, peut être reliée à une même extrémité de liaison 2 d'une tige métallique au moyen d'entretoises métalliques biconiques 3, 4, 5 dont les hauteurs du collet médian 30, 40, 50 sont différentes en vue de permettre l'adaptation à des longueurs de col différentes.In Figures 1 to 3, we see that the same head 1 made of ceramic, metal or metal coated with ceramic, can be connected to the same connecting end 2 of a metal rod by means of metal spacers biconicals 3, 4, 5 whose heights of the median collar 30, 40, 50 are different in order to allow adaptation to different lengths of neck.

Le cône supérieur de l'entretoise est emmanché dans une cavité complémentaire de la tête et le brasage n'est pas indispensable puisqu'il s'agit d'un emmanchement conique.The upper cone of the spacer is fitted into a cavity complementary to the head and soldering is not essential since it is a conical fitting.

La hauteur de la portion de l'entretoise engagée dans la tête est constante, si bien que la tête peut être dimensionnée une fois pour toutes pour éviter le risque d'éclatement.The height of the portion of the spacer engaged in the head is constant, so that the head can be dimensioned once and for all to avoid the risk of bursting.

Dans la variante des figures 4., 5 et 6, la tête 6 en céramique comporté une base saillante tronconique qui vient s'emmancher dans un réceptacle complémentaire formé par l'entretoise 8, 9 ou 10.In the variant of FIGS. 4, 5 and 6, the ceramic head 6 has a projecting frustoconical base which is fitted into a complementary receptacle formed by the spacer 8, 9 or 10.

Celle-ci comporte une base tronconique pleine 80, 90, 100 qui s'emmanche dans la cavité tronconique complémentaire de la tige 7, cavité identique à celle de la variante précéden te, de façon à assurer l'interchangeabilité totale de la tête. L'entretoise comporte cette fois une coupelle supérieure 81, 91, 101 dont l'embase est de hauteur variable d'une entretoise à l'autre pour permettre l'adaptation à des longueurs de col différentes.This comprises a solid frustoconical base 80, 90, 100 which is fitted into the frustoconical cavity complementary to the rod 7, cavity identical to that of the previous variant, so as to ensure total interchangeability of the head. The spacer this time comprises an upper cup 81, 91, 101, the base of which is of variable height from one spacer to another to allow adaptation to different neck lengths.

Le matériau céramique de la base saillante de la tête est mis en compression dans le. réceptacle formé par la coupelle, ce qu'il supporte beaucoup mieux que des efforts de -traction. The ceramic material of the projecting base of the head is compressed in the. receptacle formed by the cup, which it supports much better than efforts of -traction.

Une forme d'exécution avantageuse de la coupelle est celle que représentent les figures 4 à 6, où la formé extérieure comporte une partie sphérique, de même rayon que la sphère de la tête qui lui est rapportée, quelle qu'en soit le modèle. De la sorte, pour des ensembles à trois pièces, se trouve minimisé le risque de déboîtement de la tête par rapport à la coupelle.An advantageous embodiment of the cup is that represented in FIGS. 4 to 6, where the external formed comprises a spherical part, of the same radius as the sphere of the head which is attached to it, whatever the model. In this way, for three-piece assemblies, the risk of dislocation of the head with respect to the cup is minimized.

La variante décrite et illustrée par les figures 4 à 6 a l'avantage de permettre l'utilisation de têtes de faible diamètre (26 mm jusqu'à 22 mm, par exemple) dont la dimension réduite serait un obstacle à une mise en oeuvre efficace du mode d'exécution des figures 1 à 3. The variant described and illustrated in Figures 4 to 6 has the advantage of allowing the use of small diameter heads (26 mm up to 22 mm, for example) whose reduced size would be an obstacle to effective implementation of the embodiment of Figures 1 to 3.

Dans cette variante, on peut envisager également, sous les mêmes réserves que celles précédemment formulées, d'effectuer une opération de pré-assemblage fixe, pouvant consister en particulier en un brasage de la base saillante de la tête dans le réceptacle de la coupelle. In this variant, it can also be envisaged, subject to the same reservations as those previously formulated, to carry out a fixed pre-assembly operation, which may consist in particular of brazing the projecting base of the head in the receptacle of the cup.

Claims (7)

RevendicationsClaims 1. Prothèse de hanche comportant une tête en forme de calotte sphérique, en céramique, en métal, ou en métal revêtu de céramique, et une tige, avantageusement métallique, comportant une extrémité de liaison avec la tête, caractérisée en ce que ladite extrémité de liaison (2 ou 7) comporte une cavité tronconique et que la tête et la tige sont reliées entre elles au moyen d'entretoises intermédiaires de hauteur variable, avantageusement métalliques (4, 5, 8, 9, 10), comportant une partie pleine tronconique complémentaire de ladite cavité. 1. Hip prosthesis comprising a head in the shape of a spherical cap, made of ceramic, metal, or metal coated with ceramic, and a rod, advantageously metallic, comprising a connection end with the head, characterized in that said end of connection (2 or 7) has a frustoconical cavity and the head and the rod are connected together by means of intermediate spacers of variable height, advantageously metallic (4, 5, 8, 9, 10), comprising a solid frustoconical part complementary to said cavity. 2. Prothèse selon la revendication 1, caractérisée en ce que chaque entretoise comporte une deuxième partie tronconique pleine symétrique de la première qui s'emmanche dans une cavité tronconique de la tête. 2. Prosthesis according to claim 1, characterized in that each spacer has a second frustoconical full symmetrical part of the first which is fitted into a frustoconical cavity of the head. 3. Prothèse selon la revendication 2, caractérisée en ce que les deux parties tronconiques de l'entretoise sont reliées par un collet (30, 40, 50) de hauteur variable. 3. Prosthesis according to claim 2, characterized in that the two frustoconical parts of the spacer are connected by a collar (30, 40, 50) of variable height. 4. Prothèse selon la revendication 1, caractérisée en ce que la tête est en céramique et que chaque entretoise comporte une coupelle (81, 91, 101) formant un réceptacle tronconique pour une partie tronconique saillante de la tête. 4. Prosthesis according to claim 1, characterized in that the head is made of ceramic and that each spacer comprises a cup (81, 91, 101) forming a frustoconical receptacle for a frustoconical protruding part of the head. 5. Prothèse selon la revendication 4, caractérisée en ce que l'embase de ladite coupelle a une épaisseur variable. 5. Prosthesis according to claim 4, characterized in that the base of said cup has a variable thickness. 6. Prothèse selon la revendication 4 ou 5, caractérisée en ce que la partie supérieure de ladite coupelle a uné forme extérieure sphérique de même rayon que celui de la tête sphérique qui lui est rapportée.  6. Prosthesis according to claim 4 or 5, characterized in that the upper part of said cup has a spherical external shape of the same radius as that of the spherical head which is attached to it. 7. Prothèse selon l'une des revendications 2 à 6, caractérisée en ce que la partie tronconique saillante de la tête est brasée ou pré-assemblée d'autre manière dans ledit réceptacle.  7. Prosthesis according to one of claims 2 to 6, characterized in that the projecting frustoconical part of the head is brazed or pre-assembled in another way in said receptacle.
FR8709673A 1987-07-08 1987-07-08 HIP PROSTHESIS WITH ADJUSTMENT SPACER HAVING A TAPERED PART CONNECTED IN A COMPLEMENTARY ROD CAVITY Expired - Lifetime FR2617706B1 (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406040A2 (en) * 1989-06-28 1991-01-02 La Biomecanique Integree Prosthesis ball-joint
FR2649006A1 (en) * 1989-06-28 1991-01-04 Biomecanique Integree HEAD OF PROSTHESIS, IN PARTICULAR FOR HIP PROSTHESIS
EP0532617A1 (en) * 1990-06-06 1993-03-24 Ronald Sekel Hip prosthesis.
FR2701388A1 (en) * 1993-02-16 1994-08-19 Landanger Landos Prosthetic element for small joints.
US5766263A (en) * 1996-01-16 1998-06-16 Eska Implants Gmbh & Co. Femur endoprosthesis for artificial hip joint
WO1998046172A1 (en) * 1997-04-11 1998-10-22 Smith & Nephew, Inc. Modular humeral prosthesis
US5944758A (en) * 1996-10-09 1999-08-31 Minnesota Mining And Manufacturing Company Shoulder prosthesis
EP1482873A1 (en) * 2002-02-08 2004-12-08 Portland Orthopaedics Pty Ltd Modular prosthesis assembly including tapered adjustments
WO2005060877A1 (en) * 2003-12-12 2005-07-07 Mariasal Investment N.V. Movable neck and stem for hip prosthesis, made in such a way as to facilitate their disengagement
US7097663B1 (en) 2001-12-17 2006-08-29 Smith & Nephew, Inc. Modular prosthesis system with novel locking mechanism
US7189261B2 (en) 1998-04-03 2007-03-13 Smith & Nephew, Inc. Modular humeral prosthesis and method
WO2008114112A1 (en) * 2007-03-20 2008-09-25 Mariasal Investment N.V. Removable femoral neck with stem for hip prostheses

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0202141A2 (en) * 1985-04-12 1986-11-20 META CERAM: Société dite Femoral head for a hip joint prosthesis
DE8701244U1 (en) * 1986-01-14 1987-03-12 orthoplant Endoprothetik GmbH, 2800 Bremen Hip joint endoprosthesis
DE3542016A1 (en) * 1985-11-28 1987-06-04 Orthoplant Endoprothetik Individually adjustable hip joint endoprosthesis and a method of producing it
EP0201407B1 (en) * 1985-04-24 1990-07-18 Patrick Montagne Set of parts for forming a femoral prosthesis

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0202141A2 (en) * 1985-04-12 1986-11-20 META CERAM: Société dite Femoral head for a hip joint prosthesis
EP0201407B1 (en) * 1985-04-24 1990-07-18 Patrick Montagne Set of parts for forming a femoral prosthesis
DE3542016A1 (en) * 1985-11-28 1987-06-04 Orthoplant Endoprothetik Individually adjustable hip joint endoprosthesis and a method of producing it
DE8701244U1 (en) * 1986-01-14 1987-03-12 orthoplant Endoprothetik GmbH, 2800 Bremen Hip joint endoprosthesis

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2649006A1 (en) * 1989-06-28 1991-01-04 Biomecanique Integree HEAD OF PROSTHESIS, IN PARTICULAR FOR HIP PROSTHESIS
EP0406040A3 (en) * 1989-06-28 1991-04-03 La Biomecanique Integree: Societe Dite Prosthesis ball-joint
EP0406040A2 (en) * 1989-06-28 1991-01-02 La Biomecanique Integree Prosthesis ball-joint
EP0532617A1 (en) * 1990-06-06 1993-03-24 Ronald Sekel Hip prosthesis.
EP0532617A4 (en) * 1990-06-06 1993-04-07 Ronald Sekel Hip prosthesis
FR2701388A1 (en) * 1993-02-16 1994-08-19 Landanger Landos Prosthetic element for small joints.
EP0611560A1 (en) * 1993-02-16 1994-08-24 LANDANGER- LANDOS, Société Anonyme Prosthetic element for small joints
US5766263A (en) * 1996-01-16 1998-06-16 Eska Implants Gmbh & Co. Femur endoprosthesis for artificial hip joint
US5944758A (en) * 1996-10-09 1999-08-31 Minnesota Mining And Manufacturing Company Shoulder prosthesis
WO1998046172A1 (en) * 1997-04-11 1998-10-22 Smith & Nephew, Inc. Modular humeral prosthesis
US6197063B1 (en) 1997-04-11 2001-03-06 Smith & Nephew, Inc. Modular humeral prosthesis and method
US7189261B2 (en) 1998-04-03 2007-03-13 Smith & Nephew, Inc. Modular humeral prosthesis and method
US7758650B2 (en) 1998-04-03 2010-07-20 Smith & Nephew, Inc. Modular humeral prosthesis and method
US7097663B1 (en) 2001-12-17 2006-08-29 Smith & Nephew, Inc. Modular prosthesis system with novel locking mechanism
EP1482873A1 (en) * 2002-02-08 2004-12-08 Portland Orthopaedics Pty Ltd Modular prosthesis assembly including tapered adjustments
EP1482873A4 (en) * 2002-02-08 2006-05-03 Portland Orthopaedics Pty Ltd Modular prosthesis assembly including tapered adjustments
WO2005060877A1 (en) * 2003-12-12 2005-07-07 Mariasal Investment N.V. Movable neck and stem for hip prosthesis, made in such a way as to facilitate their disengagement
WO2008114112A1 (en) * 2007-03-20 2008-09-25 Mariasal Investment N.V. Removable femoral neck with stem for hip prostheses

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