FR2768328A1 - Femoral implant - Google Patents

Femoral implant Download PDF

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Publication number
FR2768328A1
FR2768328A1 FR9711663A FR9711663A FR2768328A1 FR 2768328 A1 FR2768328 A1 FR 2768328A1 FR 9711663 A FR9711663 A FR 9711663A FR 9711663 A FR9711663 A FR 9711663A FR 2768328 A1 FR2768328 A1 FR 2768328A1
Authority
FR
France
Prior art keywords
rod
centering
femoral implant
implant according
medial
Prior art date
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.)
Granted
Application number
FR9711663A
Other languages
French (fr)
Other versions
FR2768328B1 (en
Inventor
Christian Mazel
Thomasson Emmanuel De
Olivier Guigand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tornier SAS
Original Assignee
Tornier SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tornier SAS filed Critical Tornier SAS
Priority to FR9711663A priority Critical patent/FR2768328B1/en
Publication of FR2768328A1 publication Critical patent/FR2768328A1/en
Application granted granted Critical
Publication of FR2768328B1 publication Critical patent/FR2768328B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
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    • A61F2/367—Proximal or metaphyseal parts of shafts
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    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
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    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4619—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof for extraction
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    • A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
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    • 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
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    • 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
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    • A—HUMAN NECESSITIES
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0039—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in diameter
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00353—Bone cement, e.g. polymethylmethacrylate or PMMA

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 shank (2) of the implant has a series of centering studs (6) on its outer surface. The studs are of varying thickness, depending on the size of the shank, so that they provide a gap of constant width between the shank and the inner wall of the medullary canal (4) for a constant and homogenous thickness of cement (3). The studs are located on medial (25), posterior (27) and anterior (28) faces of the metaphysis section (20) of the implant, and on the medial (25) and lateral (26) faces of its diaphysis section (23). An additional stud (7) is located at the tip of the shank to give mediolateral or anterior-posterior centering. The studs can be made with stems fitted into blind holes drilled in the shank and made so they shear off when the shank is withdrawn from the canal.

Description

La présente invention est relative à un implant fémoral pour prothèse totale de la
hanche et plus particulièrement à un ensemble de tiges fémorales destinées
chacune à être cimentée dans le canal médullaire d'un fémur.The present invention relates to a femoral implant for total prosthesis of the
hip and more particularly to a set of femoral stems intended
each to be cemented in the medullary canal of a femur.

On sait que les chirurgiens doivent avoir à leur disposition trois types de tiges
fémorales, à savoir des tiges destinées à être scellées à l'os au moyen d'un ciment
polymérisable, des tiges destinées à être ancrées mécaniquement à l'os par des
moyens appropriés et des tiges de reprise présentant une plus grande longueur que
les deux autres types de tiges précitées.We know that surgeons must have at their disposal three types of rods
femoral, namely stems intended to be sealed to the bone by means of a cement
polymerizable, rods intended to be mechanically anchored to the bone by
suitable means and recovery rods having a greater length than
the two other types of rods mentioned above.

On constate que les tiges scellées à l'os par du ciment, proposées ne permettent
pas d'être centrées dans une épaisseur constante de ciment.It is noted that the stems sealed to the bone by cement, proposed do not allow
not to be centered in a constant thickness of cement.

En outre, lorsqu'il existe des plots centreurs, on remarque que ceux-ci ne varient pas
en épaisseur en fonction de la taille de l'implant conduisant à une épaisseur de
ciment proportionnellement importante sur les petites tailles et faible sur les grandes
tailles.In addition, when there are centering pads, it is noted that these do not vary
in thickness depending on the size of the implant leading to a thickness of
proportionally large cement on small sizes and small on large
sizes.

En effet, dans la plupart des cas l'homogéneité de l'épaisseur du ciment réparti
autour de la prothèse est difficile à contrôler.Indeed, in most cases the homogeneity of the thickness of the distributed cement
around the prosthesis is difficult to control.

C'est à ces inconvénients qu'entend plus particulièrement remédier la présente
invention.It is these drawbacks that the present invention intends to remedy more particularly.
invention.

Pour cela l'implant suivant la présente invention a pour but de garantir un espace
constant entre l'os et l'implant en fonction de sa taille pour permettre la mise en
place d'une épaisseur constante et homogène de ciment.For this, the implant according to the present invention aims to guarantee a space
constant between the bone and the implant depending on its size to allow the setting
place of a constant and homogeneous thickness of cement.

L'implant fémoral suivant la présente invention comprend une tige destinée à être
scellée par l'intermédiaire d'un ciment dans le canal médullaire d'un fémur, ladite tige
comportant sur ses facettes des plots centreurs dont l'épaisseur varie en fonction de
la taille de ladite tige pour garantir un espace constant entre la paroi interne du canal
médullaire et la face exteme de l'implant afin d'introduire sur toute sa hauteur une
épaisseur constante et homogène de ciment.The femoral implant according to the present invention comprises a rod intended to be
sealed by means of a cement in the medullary canal of a femur, said rod
comprising on its facets centering studs whose thickness varies according to
the size of said rod to guarantee a constant space between the internal wall of the channel
medullary and the external face of the implant in order to introduce over its entire height
constant and homogeneous thickness of cement.

L'implant fémoral suivant la présente invention comporte des plots centreurs qui sont
disposés d'une part sur les faces médiale, postérieure et antérieure de la partie
métaphysaire et d'autre part sur les faces médiale et latérale de la partie diaphysaire
de la tige.The femoral implant according to the present invention comprises centering pads which are
arranged on the one hand on the medial, posterior and anterior sides of the part
metaphyseal and on the other hand on the medial and lateral faces of the diaphyseal part
of the stem.

L'implant fémoral conforme à l'invention présente une tige comportant dans sa partie
diaphysaire et plus particulièrement à l'extrémité libre de sa queue médullaire un plot
centreur qui permet un centrage approprié médio-latéral ou antéro-postérieure selon
la taille de l'implant dans le canal médullaire du fémur.The femoral implant according to the invention has a rod comprising in its part
diaphyseal and more particularly at the free end of its medullary tail a stud
centering device which allows appropriate centro-lateral or antero-posterior centering according to
the size of the implant in the medullary canal of the femur.

Un autre avantage suivant l'invention consiste en ce que l'implant fémoral comprend
des plots qui sont réalisé en polyméthyl métacrylate. Another advantage according to the invention consists in that the femoral implant comprises
studs which are made of polymethyl methacrylate.

La description qui va suivre en regard des dessins annexés, donnés à titre d'exemples non limitatifs, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer:
Figure 1 est une vue de face représentant l'implant fémoral suivant la présente invention, vue dans le plan frontal anatomique.The description which follows with reference to the appended drawings, given by way of nonlimiting examples, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
Figure 1 is a front view showing the femoral implant according to the present invention, seen in the anatomical frontal plane.

Figure 2 est une vue de côté montrant l'implant fémoral suivant la présente invention, vu dans le plan sagittal anatomique.Figure 2 is a side view showing the femoral implant according to the present invention, seen in the sagittal anatomical plane.

Figure 3 est un coupe suivant 111.111 de figure 2 illustrant le plot centreur disposé sur la face médiale de la partie métaphysaire de l'implant fémoral.Figure 3 is a section along 111.111 of Figure 2 illustrating the centering pad disposed on the medial face of the metaphyseal part of the femoral implant.

Figure 4 est une coupe suivant IV-IV de figure 2 représentant les plots centreurs solidaires des face postérieure et antérieure de la partie métaphysaire de l'implant fémoral.Figure 4 is a section along IV-IV of Figure 2 showing the centralizing studs integral with the posterior and anterior face of the metaphyseal part of the femoral implant.

Figure 5 est une coupe suivant V-V de figure 1 montrant le plot centreur disposé sur la face latérale de la partie diaphysaire de l'implant fémoral.Figure 5 is a section along V-V of Figure 1 showing the centering pad disposed on the lateral face of the diaphyseal part of the femoral implant.

Figure 6 est une coupe suivant VI-VI de figure 1 illustrant le plot centreur solidaire de la face médiale de la partie diaphysaire de l'implant fémoral.Figure 6 is a section along VI-VI of Figure 1 illustrating the centralizing stud secured to the medial face of the diaphyseal part of the femoral implant.

Figure 7 est une coupe partielle montrant la fixation des plots centreurs dans l'implant fémoral.Figure 7 is a partial section showing the fixing of the centering pads in the femoral implant.

Figure 8 est une coupe partielle semblable à celle de figure 7, mais représentant une variante pour la fixation des plots centreurs dans l'implant fémoral.Figure 8 is a partial section similar to that of Figure 7, but showing a variant for fixing the centering pads in the femoral implant.

Figure 9 est une coupe partielle semblable à celle de la figure 7, mais représentant une seconde variante pour la fixation des plots centreurs.Figure 9 is a partial section similar to that of Figure 7, but showing a second variant for fixing the centering pads.

On a montré en figures 1 à 6 un implant fémoral 1 comportant une tige 2 destinée à être scellée au moyen d'un ciment polymérisable 3 à l'intérieur du canal médullaire 4 d'un fémur 5 d'un patient.FIGS. 1 to 6 show a femoral implant 1 comprising a rod 2 intended to be sealed by means of a polymerizable cement 3 inside the medullary canal 4 of a femur 5 of a patient.

La tige 2 comporte une partie métaphysaire 20 évasée tant dans le plan sagittal que dans le plan frontal. La partie métaphysaire 20 présente une section transversale oblongue qui est raccordée au niveau proximal à un col 21 également évasée se terminant par une extrémité tronconique 22 à faible pente destinée à recevoir une tête sphérique non représentée.The rod 2 has a metaphyseal part 20 flared both in the sagittal plane and in the frontal plane. The metaphyseal part 20 has an oblong cross section which is connected proximally to a neck 21 also flared ending in a frustoconical end 22 with a slight slope intended to receive a spherical head not shown.

La partie métaphysaire 20 se prolonge au niveau distal, c'est à dire à l'opposé du col 21, par une partie diaphysaire 23 constituée d'une queue médullaire 24 dont au moins une partie présente une forme conique à faible pente.The metaphyseal part 20 extends at the distal level, that is to say opposite the neck 21, by a diaphyseal part 23 consisting of a medullary tail 24 at least one part of which has a conical shape with a slight slope.

La partie métaphysaire 20 présente une face médiale ou interne 25 à profil légèrement courbe qui se prolonge dans la partie diaphysaire 23 de la tige 2. The metaphyseal part 20 has a medial or internal face 25 with a slightly curved profile which extends into the diaphyseal part 23 of the rod 2.

La face médiale 25 présente un rayon de courbure qui est constant sur toute la hauteur de la partie métaphysaire 20.The medial face 25 has a radius of curvature which is constant over the entire height of the metaphyseal part 20.

La tige 2 comporte sur toute sa hauteur et à l'opposé de la face médiale 25 une face latérale ou exteme 26 dont le profil extérieur varie en fonction de sa pente par rapport à l'axe diaphysaire. En effet la face latérale 26 présente un profil dans la partie métaphysaire 20 qui est différent de celui prévu dans la partie diaphysaire 23.The rod 2 comprises over its entire height and opposite the medial face 25 a lateral or external face 26 whose external profile varies as a function of its slope relative to the diaphyseal axis. Indeed, the lateral face 26 has a profile in the metaphyseal part 20 which is different from that provided in the diaphyseal part 23.

Les faces médiale 25 et latérale 26 sont raccordées l'une à l'autre par l'intermédiaire de deux faces opposées 27 et 28 présentant une double pente.The medial 25 and lateral 26 faces are connected to each other by means of two opposite faces 27 and 28 having a double slope.

Les faces postérieure 27 et antérieure 28 comportent une première pente par rapport à l'axe XX' de manière que la tige 2 présente, sur toute sa hauteur, une partie moins épaisse du coté de la face médiale 25 que celui prévu du coté de la face latérale 26 (Figures 3 à 6).The rear 27 and anterior 28 faces have a first slope with respect to the axis XX 'so that the rod 2 has, over its entire height, a part which is thinner on the side of the medial face 25 than that provided on the side of the lateral face 26 (Figures 3 to 6).

En outre les faces postérieure 27 et antérieure 28 présentent une seconde conicité indépendante de la première qui est prévue suivant l'axe vertical de la tige 2.Furthermore, the rear 27 and front 28 faces have a second conicity independent of the first which is provided along the vertical axis of the rod 2.

Le profil de la tige 2, et plus particulièrement les parties métaphysaire 20 et diaphysaire 23, sont prévues pour s'adapter à celui du canal médullaire 4 qui est obtenu au moyen d'une râpe non représenté.The profile of the rod 2, and more particularly the metaphyseal 20 and diaphyseal 23 parts, are provided to adapt to that of the medullary canal 4 which is obtained by means of a rasp not shown.

La partie métaphysaire 20 comporte sur sa face médiale 25 et en dessous du col 21 un plot centreur 6, tandis que deux autres plots centreurs 6 sont solidaires respectivement des faces postérieure 27 et antérieure 28.The metaphyseal part 20 has on its medial face 25 and below the neck 21 a centering stud 6, while two other centering studs 6 are secured respectively to the rear 27 and front 28 faces.

On note que les plots centreurs 6 solidaires des faces postérieure 27 et antérieure 28 sont disposés en dessous de celui fixé sur la face médiale 25.It will be noted that the centering pads 6 integral with the rear 27 and anterior 28 faces are arranged below that fixed on the medial face 25.

Également la partie diaphysaire 23 est solidaire sur chacune de ses faces médiale 25 et latérale 26 d'un plot centreur 6. Ces demiers sont décalés l'un par rapport à l'autre de manière que le plot centreur 6 solidaire de la face médiale 25 soit disposé en dessous de celui fixé sur la face latérale 26.Also the diaphyseal part 23 is integral on each of its medial 25 and lateral 26 faces with a centering pad 6. These latter are offset with respect to each other so that the centering pad 6 secured to the medial face 25 is arranged below that fixed on the lateral face 26.

En outre, la partie diaphysaire 23 comprend à l'extrémité libre de la queue médullaire 24 un plot centreur 7.In addition, the diaphyseal part 23 comprises at the free end of the medullary tail 24 a centering pad 7.

En figures 7 et 8 on a montré la fixation des plots centreurs 6 sur la tige 2 de l'implant 1. La tige 2 est percée de trous borgnes 29 destinés à recevoir en force les plots6et7 . In FIGS. 7 and 8, the fixing of the centralizing studs 6 has been shown on the rod 2 of the implant 1. The rod 2 is pierced with blind holes 29 intended to receive the studs 6 and 7 by force.

Chaque plot 6 est constituée d'une tête bombée 60 solidaire d'un doigt 61 qui coopère avec le trou borgne 29 correspondant. En fonction du diamètre du doigt 61 le trou borgne 29 correspondant est prévu d'un diamètre suffisant pour recevoir en force ledit doigt du plot 6. Each pad 6 consists of a domed head 60 secured to a finger 61 which cooperates with the corresponding blind hole 29. Depending on the diameter of the finger 61, the corresponding blind hole 29 is provided with a diameter sufficient to receive said finger of the stud 6 by force.

Lorsque le doigt 61 est d'un diamètre important, il est prévu un rétrécissement 62 au niveau de la tête 60 pour constituer une zone de rupture. When the finger 61 is of a large diameter, a narrowing 62 is provided at the level of the head 60 to constitute a rupture zone.

Le diamètre des doigts 61 ou du rétrécissement 62 est calculé pour ne pas résister à un effort de traction lors du retrait de l'implant 1. En effet les têtes 60 de chaque plot 6 étant emprisonnés dans du ciment 3, il est donc nécessaire que chaque plot puisse se rompre sous un effort de traction de l'implant afin de permettre son retrait du canal médullaire 4.The diameter of the fingers 61 or of the constriction 62 is calculated so as not to withstand a tensile force during the removal of the implant 1. In fact the heads 60 of each stud 6 being trapped in cement 3, it is therefore necessary that each stud can rupture under a tensile force of the implant in order to allow its withdrawal from the medullary canal 4.

Également le plot centreur 7 comporte une tête 70 solidaire d'un doigt 70 qui est emmanché en force dans le trou borgne 29 prévu à l'extrémité de la queue médullaire 24. La tête 70 présente un profil oblong pour permettre un centrage de la tige 2 dans le sens médio latéral. En outre, le plot 7 permet de garantir la même épaisseur de ciment 3 dans partie basse de la tige 2 de l'implant 1 (figure 2).Also the centering pad 7 comprises a head 70 secured to a finger 70 which is force fitted into the blind hole 29 provided at the end of the medullar tail 24. The head 70 has an oblong profile to allow centering of the rod 2 in the medio lateral direction. In addition, the stud 7 ensures the same thickness of cement 3 in the lower part of the rod 2 of the implant 1 (Figure 2).

Les plots centreurs 6 et 7 sont réalisés dans un matériau de polyméthyl métacrylate (PMMA) semblable à celui utilisé pour le ciment 3 permettant la fixation de l'implant 1.The centering pads 6 and 7 are made of a polymethyl methacrylate (PMMA) material similar to that used for the cement 3 allowing the implant 1 to be fixed.

On constate que pour un même implant 1 les plots centreurs 6 sont semblables c'est à dire, que l'épaisseur de la tête 60, dépassant à l'extérieure de la tige 2, est identique pour constituer un espace constant entre la paroi interne du canal 4 et la face externe de ladite tige.It can be seen that for the same implant 1 the centering pads 6 are similar, that is to say that the thickness of the head 60, protruding outside the rod 2, is identical to constitute a constant space between the internal wall of channel 4 and the external face of said rod.

Par contre l'épaisseur des plots 6 varie en fonction de la taille de l'implant 1 pour que le fourreaux de ciment 3 soit suffisant et constant sur toute la hauteur dudit implant pour garantir une parfaite stabilisation dans le canal médullaire 4.On the other hand, the thickness of the studs 6 varies as a function of the size of the implant 1 so that the cement sheath 3 is sufficient and constant over the entire height of said implant to guarantee perfect stabilization in the medullary canal 4.

En figure 9,on a montré un plot centreur 6, comportant uniquement une tête 60, afin que cette demière puisse être collée ou fixée par tout autre moyen d'adhésion sur la face exteme de l'implant 1. In FIG. 9, a centering stud 6 has been shown, comprising only a head 60, so that the latter can be glued or fixed by any other means of adhesion to the external face of the implant 1.

Claims (10)

REVENDICATIONS 1. Implant fémoral comprenant une tige (2) destinée à être scellée par l'intermédiaire d'un ciment (3) dans le canal médullaire (4) d'un fémur (5), caractérisée en ce que la tige (2) comporte sur sa face exteme des plots centreurs (6) dont l'épaisseur vane en fonction de la taille de ladite tige pour garantir un espace constant entre la paroi inteme du canal médullaire (4) et la face exteme de l'implant (1) afin d'introduire sur toute sa hauteur une épaisseur constante et homogène de ciment (3). CLAIMS 1. Femoral implant comprising a rod (2) intended to be sealed by means of a cement (3) in the medullary canal (4) of a femur (5), characterized in that the rod (2) has on its outer face centering pads (6) whose thickness varies as a function of the size of said rod to guarantee a constant space between the inner wall of the medullary canal (4) and the outer face of the implant (1) in order to introduce a constant and homogeneous thickness of cement over its entire height (3). 2. Implant fémoral suivant la revendication 1, caractérisé en ce que les plots centreurs (6) sont disposés d'une part sur les faces médiale (25), postérieure (27) et antérieure (28) de la partie métaphysaire (20) et d'autre part sur les faces médiale (25) et latérale (26) de la partie diaphysaire (23) de la tige (2).2. femoral implant according to claim 1, characterized in that the centering pads (6) are arranged on the one hand on the medial (25), posterior (27) and anterior (28) faces of the metaphyseal part (20) and on the other hand on the medial (25) and lateral (26) faces of the diaphyseal part (23) of the rod (2). 3. Implant fémoral suivant la revendication 1, caractérisée en ce que la tige (2) comporte dans sa partie diaphysaire (23) et plus particulièrement à l'extrémité libre de sa queue médullaire (24) un plot centreur (7) qui permet un centrage approprié médio latéral, ou antéro-postérieur selon la taille de l'implant (1) dans le canal médullaire (4) du fémur (5).3. femoral implant according to claim 1, characterized in that the rod (2) comprises in its diaphyseal part (23) and more particularly at the free end of its medullary tail (24) a centering stud (7) which allows a appropriate medial lateral or anteroposterior centering depending on the size of the implant (1) in the medullary canal (4) of the femur (5). 4. Implant fémoral suivant les revendications I et 3, caractérisée en ce que la tige (2) est percée de trous borgnes (29) destinés à recevoir en force les plots centreurs (6, 7).4. Femoral implant according to claims I and 3, characterized in that the rod (2) is pierced with blind holes (29) intended to receive in force the centering pads (6, 7). 5. Implant fémoral suivant la revendication 1, caractérisé en ce que les plots (6) comporte des moyens pour se rompre sous un effort de traction lors du retrait de la tige (2) du canal médullaire (4).5. Femoral implant according to claim 1, characterized in that the studs (6) comprises means for breaking under a tensile force during the withdrawal of the rod (2) from the medullary canal (4). 6. Implant fémoral suivant la revendication 5, caractérisé en ce que chaque plot centreur (6) comprend une tête (60) solidaire d'un doigt (61) qui vient coopérer en force avec le trou borgne (29) correspondant.6. femoral implant according to claim 5, characterized in that each centering stud (6) comprises a head (60) secured to a finger (61) which comes to cooperate in force with the corresponding blind hole (29). 7. Implant fémoral suivant la revendication 6, caractérisé en ce que le doigt (61) présente un rétrécissement (62) constituant une zone de rupture du plot (6) lors d'un effort de traction sur la tige (2).7. femoral implant according to claim 6, characterized in that the finger (61) has a narrowing (62) constituting a zone of rupture of the stud (6) during a tensile force on the rod (2). 8. Implant fémoral suivant la revendication 3, caractérisé en ce que le plot centreur (7) comporte une tête oblongue (70) solidaire d'un doigt (71) qui coopère en force dans le trou borgne (29) ménagé à l'extrémité libre de la queue médullaire (24).8. Femoral implant according to claim 3, characterized in that the centering stud (7) comprises an oblong head (70) secured to a finger (71) which cooperates in force in the blind hole (29) formed at the end free of the spinal cord (24). 9. Implant fémoral suivant les revendications I et 3, caractérisé en que les plots centreurs (6, 7) sont réalisés en polyméthyl de métacrylate.9. Femoral implant according to claims I and 3, characterized in that the centering pads (6, 7) are made of polymethyl methacrylate. 10. Implant fémoral suivant la revendication 1, caractérisé en ce que les plots centreurs (6) sont retenus sur la face externe de la tige (2) par collage ou tout autre moyen d'adhésion. 10. Femoral implant according to claim 1, characterized in that the centering pads (6) are retained on the external face of the rod (2) by bonding or any other means of adhesion.
FR9711663A 1997-09-15 1997-09-15 SOLIDARITY FEMALE IMPLANT OF CENTER PLOTS Expired - Fee Related FR2768328B1 (en)

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EP1044664A2 (en) * 1999-04-13 2000-10-18 Plus Endoprothetik Ag Profile stem for anchoring a hip joint prosthesis in the femur
EP0962200A3 (en) * 1998-06-04 2001-07-18 Benoist Girard Et Cie Prosthesis construction
EP1522280A2 (en) * 2003-09-12 2005-04-13 Toshinobu Katsuya Medial/distal tip for artificial joint

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EP0554987A1 (en) * 1992-01-28 1993-08-11 Howmedica International Inc. Femoral component for use in a replacement hip joint
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Publication number Priority date Publication date Assignee Title
EP0366945A1 (en) * 1988-10-04 1990-05-09 Intraplant AG Femoral prosthesis with a set of fins
EP0483057A1 (en) * 1990-10-25 1992-04-29 SULZER Medizinaltechnik AG Centraliser for the end of a joint prosthesis stem
EP0496089A1 (en) * 1991-01-21 1992-07-29 Friedrich Baumann Stem for a hip joint prosthesis
US5116380A (en) * 1991-02-28 1992-05-26 Zimmer, Inc. Prosthetic implant with spacers having tapered trailing edges
EP0539036A1 (en) * 1991-09-30 1993-04-28 JOHNSON & JOHNSON ORTHOPAEDICS, INC. Hip prosthesis
EP0554987A1 (en) * 1992-01-28 1993-08-11 Howmedica International Inc. Femoral component for use in a replacement hip joint
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0962200A3 (en) * 1998-06-04 2001-07-18 Benoist Girard Et Cie Prosthesis construction
EP1044664A2 (en) * 1999-04-13 2000-10-18 Plus Endoprothetik Ag Profile stem for anchoring a hip joint prosthesis in the femur
EP1044664A3 (en) * 1999-04-13 2000-11-15 Plus Endoprothetik Ag Profile stem for anchoring a hip joint prosthesis in the femur
US7004973B2 (en) 1999-04-13 2006-02-28 Plus Orthopedics Ag Shaft for anchoring a hip joint prosthesis in the femur
EP1522280A2 (en) * 2003-09-12 2005-04-13 Toshinobu Katsuya Medial/distal tip for artificial joint
EP1522280A3 (en) * 2003-09-12 2005-10-26 Ltd. Senko Medical Instrument Mfg. Co. Medial/distal tip for artificial joint

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