FR2673831A1 - Femoral shaft for a hip prosthesis, and its method of manufacture - Google Patents

Femoral shaft for a hip prosthesis, and its method of manufacture Download PDF

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Publication number
FR2673831A1
FR2673831A1 FR9103149A FR9103149A FR2673831A1 FR 2673831 A1 FR2673831 A1 FR 2673831A1 FR 9103149 A FR9103149 A FR 9103149A FR 9103149 A FR9103149 A FR 9103149A FR 2673831 A1 FR2673831 A1 FR 2673831A1
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FR
France
Prior art keywords
rod
cut
blade
spur
proximal part
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FR9103149A
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French (fr)
Inventor
Rambert Andre
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RECH FABRICATION ET
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RECH FABRICATION ET
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Priority to FR9103149A priority Critical patent/FR2673831A1/en
Publication of FR2673831A1 publication Critical patent/FR2673831A1/en
Withdrawn legal-status Critical Current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
    • 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
    • A61F2/32—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
    • 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
    • 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
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30579—Special structural features of bone or joint prostheses not otherwise provided for with mechanically expandable devices, e.g. fixation devices
    • 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
    • A61F2002/3647—Necks pierced with a longitudinal bore
    • 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
    • A61F2002/3678—Geometrical features
    • A61F2002/368—Geometrical features with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow 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
    • 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

Abstract

This femoral shaft for a hip prosthesis is of the type which is anchored or engaged and not screwed, that is to say at least the proximal part (2) of which has a substantially flattened cross-section with two large sides (3) which are virtually rectilinear, and two narrow sides (4) which are rounded, one of which corresponds to the spur (2a) of the shaft. Cut into the proximal part (2) of the shaft is at least one blade (5) which is connected, to the body of the shaft, via its distal end, means being provided to deflect it outwards, after the positioning of the shaft in the medullary cavity of a resected femur, in order to prevent its ill-timed withdrawal.

Description

TIGE FEMORALE POUR PROTHESE DE HANCHE
ET SON PROCEDE DE FABRICATION.FEMALE ROD FOR HIP PROSTHESIS
AND ITS MANUFACTURING METHOD.

La présente invention concerne une tige fémorale pour prothèse de hanche, du type ancré ou emmanché et non vissé, et le procédé de fabrication de cette tige. The present invention relates to a femoral stem for hip prosthesis, of the anchored or fitted type and not screwed, and the method of manufacturing this stem.

On distingue deux familles différentes de tiges fémorales pour prothèses de hanche, à savoir les tiges vissées et les tiges ancrées ou emmanchées. There are two different families of femoral rods for hip prostheses, namely the screwed rods and the anchored or fitted rods.

Les premières qui ne font appel à aucun ciment de fixation présentent l'inconvénient d'exiger, de la part du praticien, beaucoup de doigté en fin de vissage pour éviter de faire éclater l'os diaphysaire. Pour cette principale raison, de nombreux praticiens préfèrent la seconde famille de tiges fémorales, c'est à dire celles qui se fixent par ancrage ou emmanchement, dans le canal médullaire du fémur, avec ou sans ciment. The first which do not use any fixing cement have the disadvantage of requiring, on the part of the practitioner, a lot of skill at the end of screwing to avoid breaking the diaphyseal bone. For this main reason, many practitioners prefer the second family of femoral stems, that is to say those which are fixed by anchoring or fitting, in the medullary canal of the femur, with or without cement.

Cependant, non seulement en raison de son caractère agressif à l'égard des tissus osseux mais aussi des risques de descellement dus à sa présence, les praticiens utilisent de moins en moins de ciment. On conçoit aisément qu'une bonne fixation sans ciment résulte d'un bon ancrage et que, par conséquent, elle engendre inévitablement des contraintes radiales susceptibles de faire éclater l'os diaphysaire de la même manière qu'une tige vissée. However, not only because of its aggressive nature with regard to bone tissue but also the risks of loosening due to its presence, practitioners are using less and less cement. It is easy to see that a good cementless fixation results from good anchoring and that, consequently, it inevitably generates radial stresses liable to burst the diaphyseal bone in the same way as a screwed rod.

La présente invention vise à remédier à tous ces inconvénients, en assurant une excellente fixation d'une tige fémorale de ce second type, sans avoir recours au ciment et sans engendrer de contraintes radiales dangereuses pour l'os diaphysaire. The present invention aims to remedy all these drawbacks, by ensuring excellent fixation of a femoral stem of this second type, without using cement and without generating dangerous radial stresses for the diaphyseal bone.

A cet effet, au moins dans la partie proximale de la tige qu'elle concerne, est découpée au moins une lame liée, au corps de la tige, par son extrémité distale, des moyens étant prévus pour l'infléchir en direction de l'extérieur, après mise en place de la tige dans le canal médullaire du fémur. To this end, at least in the proximal part of the rod which it concerns, is cut at least one blade linked, to the body of the rod, by its distal end, means being provided for bending it in the direction of the outside, after placement of the stem in the medullary canal of the femur.

Ainsi, après inflexion vers l'extérieur, chaque lame joue le râle d'arc-boutant s'opposant au retrait de la tige hors du canal médullaire du fémur. En outre, comme chaque lame est découpée près de l'extrémité proximale de la tige, elle se trouve située à proximité de l'extrémité supérieure du fémur, c'est-à-dire, dans une partie de cet os offrant une excellente résistance mécanique. Thus, after inflection outwards, each blade plays the rail of an buttress opposing the withdrawal of the rod out of the medullary canal of the femur. In addition, as each blade is cut near the proximal end of the stem, it is located near the upper end of the femur, that is to say, in a part of this bone offering excellent resistance mechanical.

Suivant une forme d'exécution simple de l'invention, une lame est découpée dans l'éperon de la partie proximale de la tige correspondant à la zone du grand trochanter et les moyens prévus pour l'infléchir vers l'extérieur sont constitués par une vis engageable dans la tige, depuis son extrémité proximale en direction de son éperon et apte à repousser vers l'extérieur l'extrémité libre de la lame située en cet endroit. According to a simple embodiment of the invention, a blade is cut in the spur of the proximal part of the rod corresponding to the area of the greater trochanter and the means provided for bending it outward are constituted by a screw that can be engaged in the rod, from its proximal end in the direction of its spur and capable of pushing out the free end of the blade located at this point.

Suivant une variante d'exécution de l'invention, il est prévu, en plus ou en remplacement de la lame découpée dans l'éperon de la tige, deux lames découpées dans les faces planes et larges de la partie proximale de la tige, c'est-à-dire en vis-à-vis des faces antérieure et postérieure de l'extrémité épiphysaire supérieure du fémur, des moyens étant prévus pour infléchir vers l'extérieur, ces deux lames, après mise en place de la tige dans le canal médullaire d'un fémur réséqué. According to an alternative embodiment of the invention, there is provided, in addition to or instead of the blade cut from the spur of the stem, two blades cut from the flat and wide faces of the proximal part of the stem, c '' i.e. vis-à-vis the anterior and posterior faces of the upper epiphyseal end of the femur, means being provided for bending outwards, these two blades, after the rod has been placed in the medullary canal of a resected femur.

Dans ce cas, les moyens pour infléchir ces deux lames vers l'extérieur sont avantageusement constitués par un segment tronconique prévu dans la partie médiane d'une vis engageable, depuis l'extrémité libre et accessible de la partie proximale de la tige, en direction de son éperon, ce segment tronconique étant prévu dans la partie de cette vis située entre les deux lames symétriques, en fin de vissage et de manière à les écarter l'une de l'autre. In this case, the means for bending these two blades towards the outside are advantageously constituted by a frustoconical segment provided in the middle part of an engaging screw, from the free and accessible end of the proximal part of the rod, in the direction of its spur, this frustoconical segment being provided in the part of this screw located between the two symmetrical blades, at the end of screwing and so as to separate them from one another.

Naturellement, dans le cas où cette tige comporte trois lames, la même vis est utilisée pour commander l'inflexion vers l'extérieur des trois lames. Naturally, in the case where this rod has three blades, the same screw is used to control the outward bending of the three blades.

Avantageusement, la lame située dans l'éperon ainsi que les deux lames situées dans les faces planes et larges de l'extrémité proximale de la tige sont découpées par électro-érosion, les deux dernières lames précitées étant d'ailleurs découpées simultanément suivant deux plans de coupes se croisant. Advantageously, the blade located in the spur as well as the two blades located in the flat and wide faces of the proximal end of the rod are cut by electro-erosion, the last two aforementioned blades being also cut simultaneously in two planes of intersecting cuts.

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 cette tige fémorale
figure 1 en est une vue de face en élévation
figure 2 en est une vue en coupe suivant Il-Il de figure 1
figure 3 en est une vue en coupe transversale suivant III-III de figure 2.Anyway, 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 stem
Figure 1 is a front view in elevation
Figure 2 is a sectional view along Il-Il of Figure 1
Figure 3 is a cross-sectional view along III-III of Figure 2.

Comme le montre le dessin, cette tige fémorale est du type destiné à être ancré ou emmanché, et non vissé, dans le canal médullaire d'un fémur réséqué, c'est-à-dire que son extrémité proximale 2 présente, comme cela est visible sur la figure 3, une section transversale rectangulaire aplatie avec deux grands côtés 3 sensiblement rectilignes et deux petits côtés 4 en arc de cercle.  As the drawing shows, this femoral rod is of the type intended to be anchored or fitted, and not screwed, into the medullary canal of a resected femur, that is to say that its proximal end 2 is present, as is visible in Figure 3, a flattened rectangular cross section with two long sides 3 substantially straight and two short sides 4 in an arc.

Pour assurer à cette tige une excellente fixation dans le canal médullaire d'un fémur, sans avoir recours ni à un ciment, ni à un engagement en force, selon l'invention, il est prévu au voisinage de la partie proximale 2 de cette tige, au moins une lame 5 et, de préférence, trois lames 5 et 6 liées au corps de la tige par leur extrémité distale, de manière à pouvoir être infléchies vers l'extérieur, dont une, 5, est découpée dans l'éperon 2a de la partie proximale de cette tige et dont leurs deux autres 6 sont découpées, de préférence en regard l'une de l'autre, dans les grandes faces latérales 3a de la tige correspondant aux deux grands côtés rectilignes 3 de la section transversale de son extrémité proximale 2. Les deux lames 6 sont symétriques l'une de l'autre par rapport au plan médian 2b de la tige. To provide this rod with excellent fixation in the medullary canal of a femur, without having to use either cement or force engagement, according to the invention, it is provided in the vicinity of the proximal part 2 of this rod. , at least one blade 5 and, preferably, three blades 5 and 6 linked to the body of the rod by their distal end, so that they can be bent outward, one of which, 5, is cut from the spur 2a of the proximal part of this rod and of which their other two 6 are cut, preferably facing one another, in the large lateral faces 3a of the rod corresponding to the two large rectilinear sides 3 of the cross section of its proximal end 2. The two blades 6 are symmetrical to each other with respect to the median plane 2b of the rod.

Ces trois lames 5 et 6 sont découpées au voisinage de la partie proximale 2 de la tige de sorte qu'après mise en place de cette dernière dans le canal médullaire du fémur réséqué auquel elle est destinée, ces trois lames sont situées à proximité de l'extrémité supérieure du fémur, c'est-à-dire dans une partie de cet os offrant une excellente résistance mécanique. These three blades 5 and 6 are cut in the vicinity of the proximal part 2 of the rod so that after placement of the latter in the medullary canal of the resected femur for which it is intended, these three blades are located near the 'upper extremity of the femur, that is to say in a part of this bone offering excellent mechanical strength.

Les moyens pour infléchir, vers l'extérieur, l'extrémité supérieure libre de la lame 5 sont constitués par une vis 7 engageable dans la tige, depuis son extrémité proximale 2, toujours accessible, même après mise en place de la tige, dans un trou 8 au moins partiellement taraudé au pas de la vis 7 et dont l'axe 8a, contenu dans le plan médian 2b de la tige, est orienté en direction de la lame 5 découpée dans l'éperon 2a. Les moyens pour infléchir, vers l'extérieur, les lames symétriques 6 sont constitués par un segment tronconique 7a de la vis 7 situé de manière à être au moins partiellement engagées entre elles et provoquer simultanément leur écartement mutuel et l'inflexion de la lame 5, en fin d'introduction de la vis 8. The means for bending outwardly the free upper end of the blade 5 are constituted by a screw 7 which can be engaged in the rod, from its proximal end 2, which is always accessible, even after the rod has been put in place, in a hole 8 at least partially tapped with the pitch of the screw 7 and the axis 8a, contained in the median plane 2b of the rod, is oriented towards the blade 5 cut in the spur 2a. The means for deflecting outwards the symmetrical blades 6 are constituted by a frustoconical segment 7a of the screw 7 located so as to be at least partially engaged with one another and simultaneously cause their mutual separation and the inflection of the blade 5 , at the end of the introduction of the screw 8.

On conçoit aisément qu'après mise en place de cette tige dans le canal médullaire d'un fémur réséqué et inflexion, vers l'extérieur, de la lame 5 et des deux lames 6 par introduction et vissage de la vis 7 dans son trou taraudé 8, les trois lames 5 et 6 dont les extrémités proximales sont en saillie vers l'extérieur s'opposent au retrait intempestif de la tige en lui servant d'arc-boutant et, de plus, dans une zone de grande résistance mécanique de l'os diaphysaire. It is easy to see that after this rod has been placed in the medullary canal of a resected femur and inflection outward of the blade 5 and of the two blades 6 by introducing and screwing the screw 7 into its tapped hole 8, the three blades 5 and 6, the proximal ends of which project outwards, are against the untimely withdrawal of the rod by serving as a flying buttress and, moreover, in an area of high mechanical strength of the 'diaphyseal bone.

Il faut, cependant, noter que l'élasticité naturel du matériau généralement utilisé pour la fabrication de ces tiges fémorales, tel que le zirconium ou encore l'acier inoxydable, autorise un retrait facile de cette tige si nécessaire. Il suffit, pour cela, de dévisser la vis 7 et les lames 5 et 6, libérées de toute contrainte, reprennent aussitôt leur place, effacées dans le corps de la tige. It should, however, be noted that the natural elasticity of the material generally used for the manufacture of these femoral rods, such as zirconium or even stainless steel, allows easy removal of this rod if necessary. For this, it suffices to unscrew the screw 7 and the blades 5 and 6, released from any constraint, immediately resume their place, erased in the body of the rod.

Comme cela ressort plus particulièrement de l'examen de la figure 3,
le découpage de la lame 5 et des deux lames symétriques 6 est
avantageusement réalisé par électro-érosion. En outre, le découpage des deux
lames symétriques 6 est réalisé en une seule opération suivant deux plans de
coupe 6a et 6b se croisant symétriquement, ce qui réalise, à la fois, la
découpe de leurs pourtours et leur détachement du corps de la tige. As is more apparent from the examination of FIG. 3,
the cutting of the blade 5 and of the two symmetrical blades 6 is
advantageously produced by electro-erosion. In addition, the cutting of the two
symmetrical blades 6 is produced in a single operation along two planes of
section 6a and 6b crossing each other symmetrically, which achieves, at the same time, the
cutting of their edges and their detachment from the body of the rod.

Claims (8)

REVENDICATIONS 1. Tige fémorale pour prothèse de hanche, du type ancré ou emmanché et non vissé, c'est-à-dire dont au moins la partie proximale (2) présente une section transversale sensiblement aplatie avec deux grands côtés (3) à peu près rectilignes et deux petits côtés (4) arrondis dont l'un correspond à l'éperon (2a) de la tige, caractérisée en ce que, dans la partie proximale (2) de la tige est découpée au moins une lame (5) liée, au corps de la tige, par son extrémité distale, des moyens étant prévus pour l'infléchir, vers l'extérieur, après mise en place de la tige dans le canal médullaire d'un fémur réséqué et s'opposer à son retrait intempestif. 1. Femoral stem for hip prosthesis, of the anchored or fitted and non-screwed type, that is to say of which at least the proximal part (2) has a substantially flat cross section with approximately two large sides (3). rectilinear and two short rounded sides (4), one of which corresponds to the spur (2a) of the rod, characterized in that at least one blade (5) linked in the proximal part (2) of the rod is cut , to the body of the stem, by its distal end, means being provided for deflecting it, towards the outside, after placing the stem in the medullary canal of a resected femur and opposing its untimely withdrawal . 2. Tige fémorale selon la revendication 1, caractérisée en ce qu'une lame (5) est découpée dans l'éperon (2a) de la partie proximale (2) de la tige correspondant à la zone du grand trochanter du fémur. 2. Femoral stem according to claim 1, characterized in that a blade (5) is cut in the spur (2a) of the proximal part (2) of the stem corresponding to the area of the greater trochanter of the femur. 3. Tige fémorale selon la revendication 2, caractérisée en ce que les moyens prévus pour infléchir, vers l'extérieur, la lame (5) découpée dans l'éperon (2a) de la partie proximale (2) de la tige sont constitués par une vis (7) engageable depuis l'extrémité, toujours accessible, de la partie proximale (2) dans un trou au moins partiellement taraudé (8) et dont l'axe (8a), contenu dans le plan médian (2b) de la tige est orienté en direction de la lame (5) découpée dans l'éperon (2a) de la partie proximale (2) de la tige. 3. Femoral stem according to claim 2, characterized in that the means provided for deflecting, towards the outside, the blade (5) cut in the spur (2a) of the proximal part (2) of the stem are constituted by a screw (7) which can be engaged from the end, always accessible, of the proximal part (2) in an at least partially tapped hole (8) and whose axis (8a), contained in the median plane (2b) of the rod is oriented towards the blade (5) cut in the spur (2a) of the proximal part (2) of the rod. 4. Tige fémorale selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu, en plus ou en remplacement de la lame (5) découpée dans l'éperon (2a) de la tige, deux lames (6) découpées dans les faces planes et larges (3) de la partie proximale (2) de la tige, c'est-à-dire en vis-à-vis des faces antérieure et postérieure de l'extrémité épiphysaire supérieure du fémur, des moyens étant prévus pour infléchir, vers l'extérieur, ces deux lames (6), après mise en place de la tige dans le canal médullaire d'un fémur réséqué. 4. Femoral stem according to one of the preceding claims, characterized in that it is provided, in addition to or in replacement of the blade (5) cut in the spur (2a) of the stem, two blades (6) cut out in the flat and wide faces (3) of the proximal part (2) of the stem, that is to say facing the anterior and posterior faces of the upper epiphyseal end of the femur, means being provided to bend, outwardly, these two blades (6), after placement of the rod in the medullary canal of a resected femur. 5. Tige fémorale selon la revendication 4, caractérisée en ce que les moyens pour infléchir, vers l'extérieur, les deux lames symétriques (6) sont constitués par un segment tronconique (7a) prévu dans la partie médiane d'une vis engageable, depuis l'extrémité libre et accessible de la partie proximale (2) de la tige, en direction de son éperon (2a), ce segment tronconique (7a) étant prévu dans la partie de cette vis située entre les deux lames symétriques, en fin de vissage et de manière à les écarter l'une de l'autre. 5. Femoral stem according to claim 4, characterized in that the means for bending outwards, the two symmetrical blades (6) consist of a frustoconical segment (7a) provided in the middle part of an engaging screw, from the free and accessible end of the proximal part (2) of the rod, in the direction of its spur (2a), this frustoconical segment (7a) being provided in the part of this screw located between the two symmetrical blades, at the end screwing and so as to separate them from each other. 6. Tige fémorale selon l'ensemble des revendications 2 à 5, caractérisée en ce que le segment tronconique (7a) destiné à écarter l'une de l'autre les lames symétriques (6) est prévu sur un segment de la vis (7) destinée à infléchir, vers l'extérieur, la lame (5) découpée dans l'éperon (2a). 6. Femoral stem according to all of claims 2 to 5, characterized in that the frustoconical segment (7a) intended to separate the symmetrical blades (6) from one another is provided on a segment of the screw (7 ) intended to bend, outwards, the blade (5) cut in the spur (2a). 7. Procédé de fabrication de la tige fémorale selon l'une quelconque des revendications 1 à 6, caractérisé en ce que chaque lame (5 ou 6) est découpée par électro-érosion. 7. A method of manufacturing the femoral stem according to any one of claims 1 to 6, characterized in that each blade (5 or 6) is cut by electro-erosion. 8. Procédé selon la revendication 7, caractérisé en ce que, lorsque la tige comporte deux lames symétriques (6), leur découpage est réalisé en une seule opération d'électro-érosion suivant deux plans de coupe (6a,6b) se croisant symétriquement.  8. Method according to claim 7, characterized in that, when the rod comprises two symmetrical blades (6), their cutting is carried out in a single electro-erosion operation along two cutting planes (6a, 6b) crossing symmetrically .
FR9103149A 1991-03-11 1991-03-11 Femoral shaft for a hip prosthesis, and its method of manufacture Withdrawn FR2673831A1 (en)

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FR9103149A FR2673831A1 (en) 1991-03-11 1991-03-11 Femoral shaft for a hip prosthesis, and its method of manufacture

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Application Number Priority Date Filing Date Title
FR9103149A FR2673831A1 (en) 1991-03-11 1991-03-11 Femoral shaft for a hip prosthesis, and its method of manufacture

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997048352A1 (en) * 1996-06-18 1997-12-24 Mehran Kasra Bone prosthesis fixation device and methods of using same
ES2152823A1 (en) * 1998-06-15 2001-02-01 Polo Perez Antonio Javier Retractable endomedullary fitting for bone implants and prostheses.
EP3191028A4 (en) * 2014-09-08 2018-04-11 Wendelburg, Kirk L. Femoral stem and post system for hip prosthesis

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2416281B1 (en) * 1974-04-03 1975-07-24 Fischer, Arthur, 7241 Tumlingen Connector for use in bone fractures
FR2549717A1 (en) * 1983-07-29 1985-02-01 Cuilleron J Femoral rod with flexible contacts for hip prosthesis
FR2610823A1 (en) * 1987-02-12 1988-08-19 Cuilleron J Improved femoral rod for hip prostheses
EP0385930A1 (en) * 1989-03-02 1990-09-05 GebràœDer Sulzer Aktiengesellschaft Shaft for a femoral head prosthesis
EP0308297B1 (en) * 1987-09-08 1991-08-14 Pierre Teinturier Total articular prosthesis, especially for the hip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2416281B1 (en) * 1974-04-03 1975-07-24 Fischer, Arthur, 7241 Tumlingen Connector for use in bone fractures
FR2549717A1 (en) * 1983-07-29 1985-02-01 Cuilleron J Femoral rod with flexible contacts for hip prosthesis
FR2610823A1 (en) * 1987-02-12 1988-08-19 Cuilleron J Improved femoral rod for hip prostheses
EP0308297B1 (en) * 1987-09-08 1991-08-14 Pierre Teinturier Total articular prosthesis, especially for the hip
EP0385930A1 (en) * 1989-03-02 1990-09-05 GebràœDer Sulzer Aktiengesellschaft Shaft for a femoral head prosthesis

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997048352A1 (en) * 1996-06-18 1997-12-24 Mehran Kasra Bone prosthesis fixation device and methods of using same
US6126691A (en) * 1996-06-18 2000-10-03 Mount Sinai Hospital Corporation Bone prosthesis fixation device and methods of using same
ES2152823A1 (en) * 1998-06-15 2001-02-01 Polo Perez Antonio Javier Retractable endomedullary fitting for bone implants and prostheses.
EP3191028A4 (en) * 2014-09-08 2018-04-11 Wendelburg, Kirk L. Femoral stem and post system for hip prosthesis

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