FR2475892A1 - Artificial hip joint femoral component - has axially rigid stem and slight bending elasticity formed from parallel bars - Google Patents

Artificial hip joint femoral component - has axially rigid stem and slight bending elasticity formed from parallel bars Download PDF

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Publication number
FR2475892A1
FR2475892A1 FR8003877A FR8003877A FR2475892A1 FR 2475892 A1 FR2475892 A1 FR 2475892A1 FR 8003877 A FR8003877 A FR 8003877A FR 8003877 A FR8003877 A FR 8003877A FR 2475892 A1 FR2475892 A1 FR 2475892A1
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fascicles
femur
rod
plate
femoral element
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French (fr)
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Individual
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Priority to FR8003877A priority Critical patent/FR2475892A1/en
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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
    • A61F2/36—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
    • A61F2/30721—Accessories
    • A61F2/30724—Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
    • 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
    • A61F2/367—Proximal or metaphyseal parts of 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal parts of 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
    • A61F2002/30362—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 with possibility of relative movement between the protrusion and the recess
    • A61F2002/3037—Translation along the common longitudinal axis, e.g. piston
    • 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
    • A61F2002/30448—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
    • 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
    • A61F2002/30451—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • 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
    • A61F2002/30602—Shaft made of a bundle of anchoring rods or bristles, e.g. fasciculate shaft
    • 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
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • 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
    • A61F2220/005—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
    • 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
    • A61F2220/0058—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded

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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 femoral component is for a total or partial artificial hip joint, with a plate bearing against the resected upper end of the femur. Fixed to the top face of the plate are components replacing the head and neck of the femur, and to the bottom one an anchor pin engaging in the medullar cavity. The component is secured to the femur by a stem which is axially rigid but has a slight degree of bending elasticity. The stem can comprise a bundle of bars (5) of hard but elastic material such as steel, welded to the plate at the top and held together by a ferrule (8) at the bottom.

Description

La présente invention concerne un élément fémoral pour prothèse totale ou partielle de la hanche. The present invention relates to a femoral element for total or partial prosthesis of the hip.

L'élément fémoral d'une prothèse de hanche comprend généralement une platine destinée à prendre appui sur ltextrémité reséquée du fémur, supportant, sur sa face supérieure, des organes destinés à remplacer la tête et le col du fémur et dont la face inférieure est solidaire d'un organe destiné à être engagé dans le canal médullaire du fémur et à y être scellé à l'aide d'un ciment approprié. The femoral element of a hip prosthesis generally comprises a plate intended to bear on the resected end of the femur, supporting, on its upper face, organs intended to replace the head and the neck of the femur and the lower face of which is integral an organ intended to be engaged in the medullary canal of the femur and to be sealed there using an appropriate cement.

Actuellement, cet organe est le plus souvent constitué par une tige ou broche rigide. Bien que donnant généralement satisfaction, il s'est avéré qu'une fixation absolument rigide de ltélément fémoral au fémur était préjudiciable à l'os et à sa vitalité et était à l'origine de nombreuses complications y compris des descellements prématurés exigeant une nouvelle intervention. Currently, this member is most often constituted by a rigid rod or pin. Although generally satisfactory, it has been found that an absolutely rigid fixation of the femoral element to the femur was detrimental to the bone and to its vitality and was at the origin of numerous complications including premature loosening requiring a new intervention. .

La présente invention vise à pallier ces inconvénients. The present invention aims to overcome these drawbacks.

A cet effet, dans ltélément qu'elle concerne et qui est du type précité, l'organe de fixation au fémur est constitué par une tige axialement rigide mais présentant une légère élasticité en flexion. To this end, in the element which it relates to and which is of the aforementioned type, the member for attachment to the femur is constituted by an axially rigid rod but having a slight elasticity in bending.

Suivant une forme d'exécution préférée de l'invention, la tige pour la fixation de l'élément fémoral au fémur est fasciculée, c'est-à-dire qu'elle est constituée par un faisceau de tiges élémentaires ou fascicules en matériau dur, mais légèrement élastique tel qu'en acier, dont les extré- mités supérieures sont fixées par soudure, collage ou autre similaire à la face inférieure de la platine et dont les extrémités inférieures sont assemblées entre elles par l'intermédiaire d'un embout. According to a preferred embodiment of the invention, the rod for fixing the femoral element to the femur is fasciculated, that is to say that it is constituted by a bundle of elementary rods or fascicles made of hard material , but slightly elastic, such as in steel, the upper ends of which are fixed by welding, gluing or the like to the underside of the plate and the lower ends of which are joined together by means of a ferrule.

Pour faciliter l'engagement de la broche dans le canal médullaire du fémur, suivant une caractéristique particulière de l'invention, l'embout d'assemblage des extrémités inférieures des fascicules de la tige est profilée en cône. To facilitate the engagement of the spindle in the medullary canal of the femur, according to a particular characteristic of the invention, the assembly end piece of the lower ends of the fascicles of the rod is profiled in a cone.

Lorsqu'il est prévu plus de deux fascicules pour la constitution de la tige, seules les extrémités inférieures des fascicules externes sont fixées rigidement par soudure, collage ou autre similaire à l'embout d'assemblage, les extrémités des autres fascicules , c'est-à-dire des fascicules internes ou médians étant montées coulissantes à la manière de pistons, dans l'embout. When more than two fascicles are provided for the constitution of the rod, only the lower ends of the external fascicles are rigidly fixed by welding, gluing or the like to the assembly end piece, the ends of the other fascicles are that is to say internal or median fascicles being mounted sliding in the manner of pistons, in the end piece.

Cette disposition présente l'avantage de privilégier la flexibilité latérale de la tige, c'est-à-dire celle qui est la plus nécessaire à la bonne tenue de ltélément fémur ral de cette prothèse. This arrangement has the advantage of favoring the lateral flexibility of the rod, that is to say that which is most necessary for the good performance of the femoral element of this prosthesis.

Suivant encore une autre caractéristique de l'invention, la fixation des extrémités supérieures des fascicules à la face inférieure de la platine est réalisée par l'intermédiaire d'une proéminence prévue à cet effet sur la face inférieure de la platine et ayant pour effet de donner à l'extrémité supérieure de la tige fasciculée une forme évasée améliorant sa tenue mécanique par rapport à la platine. According to yet another characteristic of the invention, the upper ends of the fascicles are fixed to the lower face of the plate by means of a protuberance provided for this purpose on the lower face of the plate and having the effect of give the upper end of the fasciculated stem a flared shape improving its mechanical strength relative to the plate.

Avantageusement, il est prévu quatre tiges ou fascicules dont deux externes et deux internes ou médians. Advantageously, four rods or fascicles are provided, two of which are external and two which are internal or median.

Suivant encore une forme d'exécution préférée de l'invention, la fixation des fascicules à la platine et à l'embout est réalisée de manière à laisser subsister un jeu entre les fascicules sur toute la longueur de la tige. According to yet another preferred embodiment of the invention, the fixing of the fascicles to the plate and to the end-piece is carried out so as to leave a clearance between the fascicles over the entire length of the rod.

Cette disposition améliore la tenue de l'ôlôment fémoral de la prothèse en facilitant la reprise osseuse entre les fascicules de la tige. This arrangement improves the holding of the femoral component of the prosthesis by facilitating bone recovery between the fascicles of the stem.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit en référence au dessin schématique annexé représentant à titre d'exemple non limitatif, une forme d'exécution de cet élément fémoral
Figure 1 en est une vue de face
Figure 2 en est une vue suivant la flèche Il de figure I
Figure 3 est une vue en coupe suivant 3-3 de figure 1. In any case, the invention will be clearly understood with the aid of the description which follows with reference to the appended schematic drawing representing by way of nonlimiting example, an embodiment of this femoral element
Figure 1 is a front view
Figure 2 is a view along the arrow II of Figure I
Figure 3 is a sectional view along 3-3 of Figure 1.

Comme le montre le dessin, l'ôlôment fémoral de cette prothèse totale ou partielle de la hanche, est du type comprenant une platine 2 destinée à prendre appui par sa face inférieure contre l'extrômitô supérieure reséquée d'un fémur et supportant, sur sa face supôrieure, les organes de remplacement du col et de la tête du fémur considéré. As the drawing shows, the femoral component of this total or partial hip prosthesis is of the type comprising a plate 2 intended to bear by its underside against the resected upper extremity of a femur and supporting, on its upper side, the organs of replacement of the neck and the head of the femur considered.

Sur le dessin, seul l'organe 3 remplaçant le col a été représenté. La face inférieure de la platine 2 est fixée à l'extrômitô supérieure d'une tige 4 destinée à être engagée dans le canal médullaire du fémur considéré. In the drawing, only the member 3 replacing the neck has been shown. The underside of the plate 2 is fixed to the upper extremity of a rod 4 intended to be engaged in the medullary canal of the femur considered.

Selon l'invention, la tige 4 est constituée par un faisceau de quatre tiges élémentaires ou fascicules 5 dont deux situés à droite sur les figures 1 et 3 externes et deux situés à gauche sur les mêmes figures internes ou "médians". According to the invention, the rod 4 is constituted by a bundle of four elementary rods or fascicles 5, two of which are located on the right in external figures 1 and 3 and two situated on the left in the same internal or "middle" figures.

Chaque fascicule 5 est réalisée en un matériau dur et légèrement élastique tel qu'en acier référence 316L conférant à la tige 4 de cette prothèse la rigidité axiale indispensable à sa tenue. Each booklet 5 is made of a hard and slightly elastic material such as steel reference 316L which gives the rod 4 of this prosthesis the axial rigidity essential for its holding.

A leur extrémité supôrieure,les fascicules 4 sont fixés par soudure 6 de préférence réalisée sous Argon,à une proéminence 7 solidaire de la face inférieure de la platine 2. Cette proéminence est conformée de manière à donner à l'extrémité supérieure de la tige 4 une forme évasée lui procurant une meilleure tenue mécanique par rapport à la platine 2. At their upper end, the fascicles 4 are fixed by welding 6, preferably carried out under Argon, to a prominence 7 secured to the underside of the plate 2. This prominence is shaped so as to give the upper end of the rod 4 a flared shape giving it better mechanical strength compared to plate 2.

Les extrémités inférieures des fascicules 5 sont assemblées au moyen d'un embout 8 dont l'extrômitô libre est conformée en cône pour faciliter l'engagement de la tige 4 dans le canal médullaire du fémur,
Comme le montre le dessin, et notamment la figure 1, seules les extrémités inférieures des fascicules 5 externes sont fixées rigidement à l'embout 8 par soudure sous Argon, tandis que les extrémités inférieures des fascicules 2 internes ou médians sont montées coulissantes à la manière de pistons dans l'embout 8.The lower ends of the fascicles 5 are assembled by means of a nozzle 8 whose free extremity is shaped like a cone to facilitate the engagement of the rod 4 in the medullary canal of the femur,
As shown in the drawing, and in particular in FIG. 1, only the lower ends of the external fascicles 5 are rigidly fixed to the end piece 8 by welding under Argon, while the lower ends of the internal or median fascicles 2 are slidably mounted in the manner pistons in the nozzle 8.

Cette disposition présente l'avangage de privilégier la flexibilité latérale de la tige 4, c'est-à-dire sa flexibilité dans le sens des flèches 9 et Il par rapport aux autres directions. This arrangement has the advantage of favoring the lateral flexibility of the rod 4, that is to say its flexibility in the direction of the arrows 9 and II relative to the other directions.

Comme cela ressort également du dessin, les fasci cules 5 de la tige 4 ne sont pas jointifs mais au contraire, la fixation de leurs extrémités supérieure et inférieure respectivement à la proéminence 7 de la platine 2 et à l'embout 8 est réalisée de manière à laisser subsister entre eux un jeu dont la présence a pour effet de faciliter la reprise osseuse entre eux ce qui améliore considérablement la tenue de cet élément fémoral. As is also apparent from the drawing, the fasci cules 5 of the rod 4 are not contiguous but on the contrary, the fixing of their upper and lower ends respectively to the protrusion 7 of the plate 2 and to the end piece 8 is made so allowing a game to remain between them, the presence of which has the effect of facilitating bone recovery between them, which considerably improves the holding of this femoral element.

Comme il va de soi, et comme il ressort de ce qui précède, l'invention ne se limite pas à la seule forme d'exécution de cet élément fémoral qui a été décrite cidessus à titre d'exemple non limitatif ; elle en embrasse, au contraire, toutes les variantes de réalisation. As is obvious, and as appears from the above, the invention is not limited to the only embodiment of this femoral element which has been described above by way of nonlimiting example; on the contrary, it embraces all of its variant embodiments.

Claims (7)

- REVENDICATIONS- CLAIMS 1. - Elément fémoral pour prothèse totale ou partielle de la hanche du type comportant une platine supérieure destinée a prendre appui sur ltextrémit/reséquée du fémur, supportant, sur sa face supérieure, des organes destinés à remplacer le tête et le col du fémur dont la face inférieure est solidaire d'un organe tel que tige ou broche destiné à être engagé dans le canal médullaire du fémur pour assurer la tenue de cet élément fémoral au fémur, caractérisé en ce que l'organe de fixation au fémur est constitué par une tige axialement rigide mais présentant une légère élasticité en flexion 1. - Femoral element for total or partial prosthesis of the hip of the type comprising an upper plate intended to bear on the end / resected of the femur, supporting, on its upper face, organs intended to replace the head and the neck of the femur of which the underside is integral with a member such as a rod or pin intended to be engaged in the medullary canal of the femur to ensure the holding of this femoral element to the femur, characterized in that the member for fixing to the femur is constituted by a axially rigid rod but having a slight elasticity in bending 2. - Elément fémoral selon la revendication 1, caractérisé en ce que la tige servant à sa fixation au fémur est fasciculée, c'est-à-dire qu'elle est constituée par un faisceau de tiges élémentaires ou fascicules en matériau dur, mais légèrement élastique tel qu'en acier, dont les extrémités supérieures sont fixées par soudure, collage ou autre similaire à la face inférieure de la platine et dont les extrémités inférieures sont assemblées entre elles par l'intermédiaire d'un embout. 2. - femoral element according to claim 1, characterized in that the rod used for its attachment to the femur is fasciculated, that is to say that it is constituted by a bundle of elementary rods or fascicles made of hard material, but slightly elastic such as in steel, the upper ends of which are fixed by welding, gluing or the like to the underside of the plate and the lower ends of which are assembled together by means of a ferrule. 3. - Elément fémoral selon la revendication 2, caractérisé en ce que pour faciliter l'engagement de la broche dans le canal médullaire du fémur, suivant une caractéristique particulière de l'invention, l'embout d'assemblage des extrémités inférieures des fascicules de la tige est profilée en cône. 3. - femoral element according to claim 2, characterized in that to facilitate the engagement of the pin in the medullary canal of the femur, according to a particular characteristic of the invention, the assembly piece of the lower ends of the fascicles of the rod is profiled in a cone. 4. - Elément fémoral selon la revendication 2 ou la revendication 3, caractérisé en ce que, lorsqu'il est prévu plus de deux fascicules pour la constituion de la tige, seules les extrémités inférieures des fascicules externes sont fixées rigidement par soudure,collage ou autre similaire à l'embout d'assemblage, les extrémités des autres fascicules, c'est-à-dire des fascicules internes ou médians étant montées coulissantes dans l'embout. 4. - femoral element according to claim 2 or claim 3, characterized in that, when more than two fascicles are provided for the constitution of the rod, only the lower ends of the external fascicles are rigidly fixed by welding, gluing or another similar to the assembly end piece, the ends of the other fascicles, that is to say internal or median fascicles being slidably mounted in the end piece. 5. - Elément fémoral selon l'une quelconque des revendications 2 à 4, caractérisé en ce que la fixation des des extrémités supérieures des fascicules à la face inférieure de la platine est réalisée par l'intermédiaire d'une proéminence prévue à cet effet sur la face inférieure de la platine et ayant pour effet de donner à l'extrémité supérieure de la tige fasciculée une forme évasée amélio rhnt sa tenue mécanique par rapport à la platine. 5. - femoral element according to any one of claims 2 to 4, characterized in that the fixing of the upper ends of the fascicles to the underside of the plate is achieved by means of a prominence provided for this purpose on the underside of the plate and having the effect of giving the upper end of the fasciculated rod a flared shape improves its mechanical strength relative to the plate. 6. - Elément fémoral selon l'une quelconque des revendications 2 à 5, caractérisé en ce qu'il est prévu quatre tiges ou fascicules dont deux externes et deux internes ou médians. 6. - femoral element according to any one of claims 2 to 5, characterized in that there are provided four rods or fascicles including two external and two internal or median. 7. - Elément fémoral selon l'une quelconque des revendications 2 à 6, caractérisé en ce que la fixation des fascicules à la platine et à l'embout est réalisée de manière à laisser subsister un jeu entre les fascicules sur toute la longueur de la tige. 7. - femoral element according to any one of claims 2 to 6, characterized in that the fixing of the fascicles to the plate and to the end piece is carried out so as to leave a clearance between the fascicles over the entire length of the rod.
FR8003877A 1980-02-18 1980-02-18 Artificial hip joint femoral component - has axially rigid stem and slight bending elasticity formed from parallel bars Pending FR2475892A1 (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516277A (en) * 1981-12-08 1985-05-14 Jean Butel Article comprising and method for fabricating a hip prosthesis having a flexible multi-element femoral rod
US4743263A (en) * 1984-11-09 1988-05-10 Ceske Vysoke Uceni Technicke Adaptable isoelastic hip-endoprosthesis
FR2610823A1 (en) * 1987-02-12 1988-08-19 Cuilleron J Improved femoral rod for hip prostheses
US4997444A (en) * 1989-12-28 1991-03-05 Zimmer, Inc. Implant having varying modulus of elasticity
US5002580A (en) * 1988-10-07 1991-03-26 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation
US5062854A (en) * 1988-10-07 1991-11-05 Pfizer Hospital Products Group Prosthetic device and method of implantation
FR2670108A1 (en) * 1990-12-06 1992-06-12 Erato Femoral element for a hip prosthesis
US5147408A (en) * 1988-10-07 1992-09-15 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2425237A1 (en) * 1978-05-09 1979-12-07 Breard Francis Prosthetic femoral head with flexible shaft - comprising series of longitudinal elements fitting into head and rigid tip and sliding relative to each other

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2425237A1 (en) * 1978-05-09 1979-12-07 Breard Francis Prosthetic femoral head with flexible shaft - comprising series of longitudinal elements fitting into head and rigid tip and sliding relative to each other

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516277A (en) * 1981-12-08 1985-05-14 Jean Butel Article comprising and method for fabricating a hip prosthesis having a flexible multi-element femoral rod
US4743263A (en) * 1984-11-09 1988-05-10 Ceske Vysoke Uceni Technicke Adaptable isoelastic hip-endoprosthesis
FR2610823A1 (en) * 1987-02-12 1988-08-19 Cuilleron J Improved femoral rod for hip prostheses
US5002580A (en) * 1988-10-07 1991-03-26 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation
US5062854A (en) * 1988-10-07 1991-11-05 Pfizer Hospital Products Group Prosthetic device and method of implantation
US5147408A (en) * 1988-10-07 1992-09-15 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation
US4997444A (en) * 1989-12-28 1991-03-05 Zimmer, Inc. Implant having varying modulus of elasticity
FR2670108A1 (en) * 1990-12-06 1992-06-12 Erato Femoral element for a hip prosthesis

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