FR2765473A1 - Complete hip prosthesis anti=luxation system - Google Patents

Complete hip prosthesis anti=luxation system Download PDF

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Publication number
FR2765473A1
FR2765473A1 FR9708291A FR9708291A FR2765473A1 FR 2765473 A1 FR2765473 A1 FR 2765473A1 FR 9708291 A FR9708291 A FR 9708291A FR 9708291 A FR9708291 A FR 9708291A FR 2765473 A1 FR2765473 A1 FR 2765473A1
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France
Prior art keywords
ring
femoral
prosthesis
head
hip prosthesis
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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.)
Pending
Application number
FR9708291A
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French (fr)
Inventor
Christophe Cermolacce
Didier Prost
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Individual
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Individual
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Priority to FR9708291A priority Critical patent/FR2765473A1/en
Publication of FR2765473A1 publication Critical patent/FR2765473A1/en
Pending legal-status Critical Current

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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
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—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
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
    • 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
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30487—Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
    • 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
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30784—Plurality of holes
    • A61F2002/30785—Plurality of holes parallel
    • 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
    • A61F2002/3233—Joints for the hip having anti-luxation means for preventing complete dislocation of the femoral head from the acetabular cup
    • 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
    • A61F2002/3241—Joints for the hip having a ring, e.g. for locking the femoral head into the acetabular cup
    • 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
    • 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
    • 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
    • A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws

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 prosthesis comprises a shank (5) with a neck (6) and a spherical head (7) engaging with a liner, e.g. of polyethylene (rtm), in an acetabular cup (8). It incorporates a flat ring (1) with a central aperture (3) of a diameter smaller than that of the spherical head, preventing the head from slipping out of the cup once the ring is fastened to it. The ring has a slit (2) narrower than the smallest diameter of the neck (6), and is sufficiently elastic to be fitted by force onto the neck. It also has holes (4) for fixings in the form of toothed dowels with expansion pins.

Description

La présente invention concerne un système anti-luxation pour prothèse de hanche et une prothèse de hanche équipée de ce système. The present invention relates to an anti-dislocation system for hip prosthesis and to a hip prosthesis equipped with this system.

Les systèmes anti-luxation sont généralement utilisés chez les sujets à risques, comme les personnes très âgées, les sujets psychiatriques ou les sujets atteints de maladies neuro-musculaires, pour éviter des luxations intempestives et répétitives de la prothèse de hanche. Ces systèmes antiluxation ont toutefois généralement pour inconvénient de limiter le débattement angulaire de l'articulation et d'engendrer de ce fait des contraintes supplémentaires qui peuvent provoquer l'arrachement du système anti-luxation, voire même le descellement de l'implant. Anti-dislocation systems are generally used in subjects at risk, such as the very elderly, psychiatric subjects or subjects suffering from neuro-muscular diseases, to avoid untimely and repetitive dislocations of the hip prosthesis. However, these antiluxation systems generally have the drawback of limiting the angular movement of the joint and thereby generating additional stresses which can cause the anti-dislocation system to be torn off, or even the implant to loosen.

Un système déjà connu comporte une bague de serrage de diamètre supérieur à la tête fémorale et un insert en polyéthylène destiné à recevoir la tête fémorale et présentant un prolongement inférieur radialement rétractable autour de la base de la tête fémorale. La bague de serrage est cerclée à force autour du prolongement inférieur de l'insert pour rétracter le prolongement sur la base de la tête fémorale et ainsi empêcher tout déboîtement de l'articulation. An already known system comprises a clamping ring with a diameter greater than the femoral head and a polyethylene insert intended to receive the femoral head and having a lower extension radially retractable around the base of the femoral head. The clamping ring is forcedly encircled around the lower extension of the insert to retract the extension on the base of the femoral head and thus prevent any dislocation of the joint.

Ce système nécessite toutefois de fabriquer un insert spécial, ce qui augmente considérablement les coûts de fabrication. En outre, ce système n'est pas facile à poser car il nécessite de rapporter une pièce séparée, la bague de serrage, dans un espace à accès limité. Il est en outre nécessaire d'enfiler la bague de serrage sur la tête femorale avant de réduire l'articulation. However, this system requires the manufacture of a special insert, which considerably increases the manufacturing costs. In addition, this system is not easy to install because it requires bringing a separate part, the clamping ring, in a space with limited access. It is also necessary to thread the clamping ring on the femoral head before reducing the joint.

L'invention a donc pour but d'éliminer les inconvénients précités et de proposer un nouveau système anti-luxation qui soit plus facile à fabriquer et à poser. The invention therefore aims to eliminate the aforementioned drawbacks and to propose a new anti-dislocation system which is easier to manufacture and to install.

A cet effet, l'invention a pour objet un système antiluxation pour prothèse totale de la hanche, caractérisé en ce qu'il comporte un anneau généralement plat dont l'orifice central a un diamètre inférieur à celui de la tête fémorale et supérieur au diamètre du col fémoral. Ainsi, l'anneau est retenu sur la tige fémorale, sans risquer de le perdre dans l'espace articulaire au cours de la pose. L'anneau étant ainsi retenu sur la tige fémorale, on peut facilement le faire tourner autour de son axe pour aligner par exemple les trous d'ancrage de l'anneau avec ceux préalablement percés dans l'insert cotyloïdien. Enfin, comme l'anneau entoure sensiblement complètement la base de la tête fémorale, on obtient une sécurité accrue contre les luxations, aussi bien antérieure que postérieure. Le risque d'arrachement de l'anneau est également moindre. To this end, the subject of the invention is an antiluxation system for total hip prosthesis, characterized in that it comprises a generally flat ring whose central orifice has a diameter less than that of the femoral head and greater than the diameter of the femoral neck. Thus, the ring is retained on the femoral stem, without the risk of losing it in the articular space during installation. The ring being thus retained on the femoral stem, one can easily rotate it around its axis to align for example the anchoring holes of the ring with those previously drilled in the acetabular insert. Finally, as the ring substantially completely surrounds the base of the femoral head, an increased safety against dislocation is obtained, both anterior and posterior. The risk of the ring tearing off is also less.

Dans une variante de réalisation, cet anneau peut être fendu avec une fente présentant une largeur inférieure au plus petit diamètre du col fémoral de façon que l'anneau puisse être élastiquement clipsé à force sur le col fémoral. In an alternative embodiment, this ring can be split with a slot having a width less than the smallest diameter of the femoral neck so that the ring can be elastically force-clipped onto the femoral neck.

Ainsi, l'anneau anti-luxation peut être clipsé sur la tige fémorale aussi bien en début de pose qu'après réduction de l'articulation.Thus, the anti-dislocation ring can be clipped onto the femoral stem both at the start of placement and after reduction of the joint.

Selon une autre caractéristique, l'orifice central de l'anneau présente à une extrémité une forme épousant celle de la tête fémorale. According to another characteristic, the central orifice of the ring has at one end a shape matching that of the femoral head.

Selon une autre caractéristique, l'anneau est percé d'une succession périphérique de trous pour le passage de moyens d'ancrage de l'anneau sur la prothèse cotyloïdienne. According to another characteristic, the ring is pierced with a peripheral succession of holes for the passage of means for anchoring the ring on the acetabular prosthesis.

Dans ce cas, les moyens d'ancrage peuvent etre constitués d'une cheville crantée radialement expansible et d'un clou d'expansion destiné à être enfoncé à force dans la cheville.In this case, the anchoring means may consist of a radially expandable notched dowel and an expansion nail intended to be forced into the dowel.

Ces moyens d'ancrage offrent une meilleure tenue qu'une vis et peuvent être impactés dans toutes les positions, même les plus reculées car il suffit de les impacter dans l'insert, alors que les vis nécessitent d'aligner l'outil de vissage avec celles-ci.These anchoring means offer better resistance than a screw and can be impacted in all positions, even the most remote, since it suffices to impact them in the insert, whereas the screws require aligning the screwing tool. with these.

L'invention vise également une prothèse de hanche équipée du système précité. Lorsque la tige fémorale est à tête démontable, un anneau anti-luxation fermé ou fendu peut être utilisé, alors que lorsque la tige fémorale est à tête non démontable, seul l'anneau fendu peut être utilisé.  The invention also relates to a hip prosthesis equipped with the aforementioned system. When the femoral stem has a removable head, a closed or split anti-dislocation ring can be used, while when the femoral stem has a non-removable head, only the split ring can be used.

L'invention sera mieux comprise, et d'autres buts, details, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative détaillée qui va suivre des deux modes de réalisation particuliers actuellement préférés de l'invention, donnés uniquement à titre illustratif et non limitatif, en référence aux dessins schématiques annexés, dans lesquels
- la figure 1 est une vue partielle et en perspective d'une prothèse fémorale équipée du système anti-luxation selon l'invention
- la figure 2 est une vue analogue à la figure 1, mais représentant le système anti-luxation avant son ancrage sur la prothèse cotyloïdienne ;
- la figure 3 est une vue analogue à la figure 2, mais représentant le système anti-luxation ancré
- la figure 4 est une vue en élévation des moyens d'ancrage du système anti-luxation sur la prothèse ; et
- la figure 5 est une variante de réalisation du système anti-luxation.The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly during the detailed explanatory description which will follow of the two particular presently preferred embodiments of the invention, given only. by way of illustration and not limitation, with reference to the accompanying schematic drawings, in which
- Figure 1 is a partial perspective view of a femoral prosthesis equipped with the anti-dislocation system according to the invention
- Figure 2 is a view similar to Figure 1, but showing the anti-dislocation system before it is anchored on the acetabular prosthesis;
- Figure 3 is a view similar to Figure 2, but showing the anchored anti-dislocation system
- Figure 4 is an elevational view of the anchoring means of the anti-dislocation system on the prosthesis; and
- Figure 5 is an alternative embodiment of the anti-dislocation system.

Suivant l'exemple de réalisation représenté sur les figures 1 à 3, le système anti-luxation de l'invention comporte un anneau plat circulaire 1 présentant une fente radiale 2, un orifice axial 3 et une succession circonférentielle de trous traversants 4. According to the embodiment shown in FIGS. 1 to 3, the anti-dislocation system of the invention comprises a circular flat ring 1 having a radial slot 2, an axial opening 3 and a circumferential succession of through holes 4.

La prothèse de hanche sur laquelle est monté le système anti-luxation de l'invention, a une constitution générale classique dans la technique. Elle est constituée d'une prothèse fémorale présentant une tige fémorale 5 destinée à être implantée dans le canal médulaire C d'un fémur F et se prolongeant par un col fémoral 6 surmonté d'une tête fémorale 7, et d'une prothèse cotyloïdienne composée par exemple d'une cupule métallique (non représentée) destinée à être implantée dans le cotyle et d'un insert par exemple en polyéthylène 8 intercalé entre la cupule et la tête fémorale. Toutefois, les dimensions respectives de l'anneau anti-luxation et de la prothèse sont étroitement liées. Ainsi, l'orifice central 3 de l'anneau présente un diamètre inférieur à celui de la tête fémorale et supérieur à celui du col fémoral. De la même manière, la fente 2 présente une largeur inférieure au plus petit diamètre du col fémoral. Ainsi, l'anneau 1 est retenu autour du col fémoral 6 entre le corps de la tige 5 et la tête 7 sans pouvoir tomber dans l'espace articulaire. The hip prosthesis on which the anti-dislocation system of the invention is mounted, has a general constitution conventional in the art. It consists of a femoral prosthesis having a femoral stem 5 intended to be implanted in the medular channel C of a femur F and extending by a femoral neck 6 surmounted by a femoral head 7, and of an acetabular prosthesis composed for example a metal cup (not shown) intended to be implanted in the acetabulum and an insert for example made of polyethylene 8 interposed between the cup and the femoral head. However, the respective dimensions of the anti-dislocation ring and the prosthesis are closely linked. Thus, the central orifice 3 of the ring has a diameter less than that of the femoral head and greater than that of the femoral neck. Similarly, the slot 2 has a width less than the smallest diameter of the femoral neck. Thus, the ring 1 is retained around the femoral neck 6 between the body of the rod 5 and the head 7 without being able to fall into the articular space.

En outre, comme l'orifice central 3 a un diamètre inférieur à celui de la tête fémorale 7, il vient emprisonner celle-ci à l'intérieur de son logement prévu dans l'insert 8 (voir figure 3). In addition, as the central orifice 3 has a diameter smaller than that of the femoral head 7, it traps the latter inside its housing provided in the insert 8 (see Figure 3).

Comme représenté sur la figure 5, l'anneau 11 peut présenter en variante une forme complètement fermée, par exemple dans le cas où la prothèse fémorale est à tête démontable. As shown in Figure 5, the ring 11 may alternatively have a completely closed shape, for example in the case where the femoral prosthesis is removable head.

En se référant maintenant à la figure 4, les moyens d'ancrage sont constitués d'une cheville 9 extérieurement crantée en 9a et radialement expansible, et d'un clou 10 destiné à s'enfoncer à force dans la cheville pour déployer radialement celle-ci dans l'insert 8. On a également représenté en 10a des petites butées de blocage du clou dans la cheville 9. Ce moyen d'ancrage spécifique permet de fixer facilement et de manière fiable l'anneau 1 sur l'insert 8, même dans les portions les moins accessibles de l'anneau, par exemple derrière le col fémoral. Referring now to FIG. 4, the anchoring means consist of an anchor 9 externally notched at 9a and radially expandable, and of a nail 10 intended to force into the anchor to radially deploy it. Ci in the insert 8. Also shown in 10a are small nail locking stops in the dowel 9. This specific anchoring means makes it possible to easily and reliably fix the ring 1 on the insert 8, even in the less accessible portions of the ring, for example behind the femoral neck.

Bien que l'invention ait été décrite en liaison avec un mode de réalisation particulier, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.  Although the invention has been described in connection with a particular embodiment, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these are within the scope of the invention.

Claims (7)

REVENDICATIONS 1. Système anti-luxation pour prothèse totale de la hanche, caractérisé en ce qu'il comporte un anneau généralement plat (1, 11) dont l'orifice central (3) a un diamètre inférieur à celui de la tête fémorale (7) et supérieur au diamètre du col fémoral (6). 1. Anti-dislocation system for total hip prosthesis, characterized in that it comprises a generally flat ring (1, 11) whose central orifice (3) has a diameter less than that of the femoral head (7) and greater than the diameter of the femoral neck (6). 2. Système selon la revendication 1, caractérisé en ce que l'anneau (1) est fendu avec une fente (2) présentant une largeur inférieure au plus petit diamètre du col fémoral (6) de façon que l'anneau puisse être élastiquement clipsé à force sur le col fémoral. 2. System according to claim 1, characterized in that the ring (1) is split with a slot (2) having a width less than the smallest diameter of the femoral neck (6) so that the ring can be elastically clipped by force on the femoral neck. 3. Système selon la revendication 1 ou 2, caractérisé en ce que l'orifice central (3) de l'anneau présente à une extrémité une forme épousant celle de la tête fémorale. 3. System according to claim 1 or 2, characterized in that the central orifice (3) of the ring has at one end a shape matching that of the femoral head. 4. Système selon l'une des revendications précédentes, caractérisé en ce que l'anneau est percé d'une succession pérphérique de trous (4) pour le passage de moyens d'ancrage sur la prothèse cotyloïdienne (8). 4. System according to one of the preceding claims, characterized in that the ring is pierced with a peripheral succession of holes (4) for the passage of anchoring means on the acetabular prosthesis (8). 5. Système selon la revendication 4, caractérisé en ce que les moyens d'ancrage sont constitués d'une cheville (9) extérieurement crantée et radialement expansible et d'un clou (10) destiné à être enfoncé à force dans la cheville. 5. System according to claim 4, characterized in that the anchoring means consist of a peg (9) externally notched and radially expandable and a nail (10) intended to be forced into the peg. 6. Prothèse totale de la hanche équipée du système selon l'une des revendications précédentes. 6. Total hip prosthesis equipped with the system according to one of the preceding claims. 7. Prothèse totale de la hanche comprenant une prothèse fémorale à tête non démontable, caractérisée en ce qu'elle est équipée du système selon la revendication 2.  7. Total hip prosthesis comprising a femoral prosthesis with non-removable head, characterized in that it is equipped with the system according to claim 2.
FR9708291A 1997-07-01 1997-07-01 Complete hip prosthesis anti=luxation system Pending FR2765473A1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2847458A1 (en) * 2002-11-25 2004-05-28 La Caffiniere Jean Yves De Prosthesis for hip joint socket has plate abutting head of prosthesis and with lug fitting into seating in cup
US6923833B2 (en) 2002-04-09 2005-08-02 Ray C. Wasielewski Biologically reabsorbable acetabular constraining components and materials for use with a hip replacement prosthesis and bioreabsorbable materials to augment hip replacement stability and function
FR2896147A1 (en) * 2006-01-18 2007-07-20 Fournitures Hospitalieres Ind Split locking ring retainer for e.g. prosthetic femoral head, has body elastically deformed between rest position and constrained position in which ring body portions are brought together, and fixation fingers for cooperating with housings
US7766971B2 (en) 2006-12-12 2010-08-03 Exactech, Inc. Constrained liner locking ring and polyethylene liner congruency feature
CN109481093A (en) * 2018-12-17 2019-03-19 北京安颂科技有限公司 Manual acetabulum prosthese and its installation method
WO2020209770A1 (en) * 2019-04-08 2020-10-15 ÅKESSON, Stig Collar for preventing dislocation of hip joint prothesis

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EP0430831A1 (en) * 1989-11-28 1991-06-05 Fabrique D'implants Et D'instruments Chirurgicaux Societe A Responsabilite Limitee Artificial acetabular cup fastened in the cotyloid cavity with cement
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EP0486422A1 (en) * 1990-11-16 1992-05-20 SULZER Medizinaltechnik AG Anchoring shaft for a femoral head prosthesis
FR2706285A1 (en) * 1993-06-17 1994-12-23 Implant Reduction Eurl Anti-luxation (anti-dislocation) prosthesis

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6923833B2 (en) 2002-04-09 2005-08-02 Ray C. Wasielewski Biologically reabsorbable acetabular constraining components and materials for use with a hip replacement prosthesis and bioreabsorbable materials to augment hip replacement stability and function
FR2847458A1 (en) * 2002-11-25 2004-05-28 La Caffiniere Jean Yves De Prosthesis for hip joint socket has plate abutting head of prosthesis and with lug fitting into seating in cup
FR2896147A1 (en) * 2006-01-18 2007-07-20 Fournitures Hospitalieres Ind Split locking ring retainer for e.g. prosthetic femoral head, has body elastically deformed between rest position and constrained position in which ring body portions are brought together, and fixation fingers for cooperating with housings
US7766971B2 (en) 2006-12-12 2010-08-03 Exactech, Inc. Constrained liner locking ring and polyethylene liner congruency feature
CN109481093A (en) * 2018-12-17 2019-03-19 北京安颂科技有限公司 Manual acetabulum prosthese and its installation method
CN109481093B (en) * 2018-12-17 2024-04-19 北京安颂科技有限公司 Artificial acetabulum prosthesis and method of installing the same
WO2020209770A1 (en) * 2019-04-08 2020-10-15 ÅKESSON, Stig Collar for preventing dislocation of hip joint prothesis

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