FR2676359A1 - Femoral shaft for a hip prosthesis - Google Patents

Femoral shaft for a hip prosthesis Download PDF

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Publication number
FR2676359A1
FR2676359A1 FR9106611A FR9106611A FR2676359A1 FR 2676359 A1 FR2676359 A1 FR 2676359A1 FR 9106611 A FR9106611 A FR 9106611A FR 9106611 A FR9106611 A FR 9106611A FR 2676359 A1 FR2676359 A1 FR 2676359A1
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France
Prior art keywords
rod
ribs
face
median axis
shaft
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Granted
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FR9106611A
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French (fr)
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FR2676359B1 (en
Inventor
Gueguen Jean-Pierre
Gueguen Yves
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SYROCO
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SYROCO
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Priority to FR9106611A priority Critical patent/FR2676359A1/en
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Publication of FR2676359B1 publication Critical patent/FR2676359B1/fr
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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
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30182—Other shapes
    • 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
    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30322—The prosthesis having different structural features at different locations within the same prosthesis differing in surface structures
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/3082—Grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879—Ribs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30891—Plurality of protrusions
    • 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
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • 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
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • 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
    • 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
    • A61F2250/0026—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 surface structures

Abstract

This shaft is of the type having a curved shape and comprising ribs. According to the invention: - on the one hand, each of the main faces (2a) of the proximal part of the shaft (2) comprises two curved, longitudinal ribs (10, 11), the free edge (10a, 11a) of which is rounded, which substantially follow the curvature of the lateral faces (2b, 2c) of the shaft (2) and which extend from the base of the neck (4), supporting the spherical head (3), to approximately a third of the length of the shaft (2), that is to say as far as the start of the rectilinear part thereof, one (10) of the ribs (10, 11) extending substantially along the median axis of the shaft (2), while the other (11) is situated on the side of the outer lateral wall of the latter, - on the other hand, the said outer lateral wall is widened and its face (2b) has a curved profile in a plane perpendicular to the longitudinal median axis of the shaft (2).

Description

TIGE FEMORALE DE PROTHESE DE HANCHE
La présente invention concerne une tige fémorale de prothèse de hanche, destinée à être fixée à l'os au moyen d'un ciment durcissable.FEMALE HIP PROSTHESIS ROD
The present invention relates to a femoral stem of a hip prosthesis, intended to be fixed to the bone by means of a hardening cement.

La détérioration de la tête du fémur conduit couramment à l'implantation d'une prothèse totale de la hanche constituée, d'une part, par une tige métallique de forme courbée, qui est, après préparation de l'os, engagée dans le canal médullaire du fémur puis fixée à lui au moyen dudit ciment et qui comporte, à son extrémité dépassant de l'os, une tête sphérique raccordée à elle par un col et, d'autre part, par un élément cotyloïdien fixé à l'os illiaque, qui forme une cavité pour la réception et le pivotement de ladite tête sphérique. Deterioration of the head of the femur commonly leads to the implantation of a total hip prosthesis consisting, on the one hand, of a metal rod of curved shape, which is, after preparation of the bone, engaged in the canal medullary of the femur then fixed to it by means of said cement and which comprises, at its end projecting from the bone, a spherical head connected to it by a neck and, on the other hand, by an acetabular element fixed to the iliac bone , which forms a cavity for receiving and pivoting said spherical head.

Certaines des tiges fémorales existantes destinées à être implantées avec ciment comprennent sur leur face principale des dents, des cannelures ou des nervures longitudinales rectilignes visant à augmenter la résistance de leur liaison avec l'os aux contraintes s'exerçant sur elles verticalement ou en rotation
En pratique, il a pu être constaté que les tiges existantes ne donnent pas entière satisfaction quant à ladite résistance, les contraintes subies par les tiges opérant à la longue une fragilisation et une détérioration locales du ciment, ce qui, outre les douleurs que cela engendre pour le patient, peut conduire à un jeu voire à un descellement des tiges.Some of the existing femoral stems intended to be implanted with cement include on their main face teeth, grooves or longitudinal straight ribs intended to increase the resistance of their connection with the bone to the stresses exerted on them vertically or in rotation
In practice, it has been found that the existing rods are not entirely satisfactory with regard to said resistance, the stresses undergone by the rods operating in the long term local embrittlement and deterioration of the cement, which, in addition to the pains that this generates for the patient, may lead to play or even loosening of the rods.

La présente invention vise à fournir une tige fémorale remédiant à cet inconvénient tout en restant simple à fabriquer et à poser. The present invention aims to provide a femoral stem remedying this drawback while remaining simple to manufacture and install.

A cette fin, dans la tige selon l'invention, du type ayant une forme courbée et comportant des nervures
- d'une part, chacune des faces principales de la partie proximale de la tige comporte deux nervures longitudinales courbes, dont le bord libre est arrondi, qui suivent sensiblement la courbure des faces latérales de la tige et qui s'étendent depuis la base du col portant la tête sphérique jusqu'à approximativement le tiers de la longueur de la tige, c'est-à-dire jusqu'à la naissance de la partie rectiligne de celle-ci, l'une des nervures s'étendant sensiblement le long de l'axe médian de la tige tandis que l'autre est située du côté de la paroi latérale extérieure de celle-ci,
- d'autre part, ladite paroi latérale extérieure est élargie et sa face présente un profil courbe dans un plan perpendiculaire à l'axe médian longitudinal de la tige.To this end, in the rod according to the invention, of the type having a curved shape and comprising ribs
- On the one hand, each of the main faces of the proximal part of the rod has two curved longitudinal ribs, the free edge of which is rounded, which substantially follow the curvature of the lateral faces of the rod and which extend from the base of the neck carrying the spherical head up to approximately one third of the length of the rod, that is to say until the birth of the straight part thereof, one of the ribs extending substantially along the median axis of the rod while the other is located on the side of the external lateral wall of the latter,
- On the other hand, said outer side wall is widened and its face has a curved profile in a plane perpendicular to the longitudinal median axis of the rod.

La tige ainsi conformée permet une large répartition sur le ciment des contraintes s'exerçant sur elle verticalement et en rotation autour de son axe, ce qui évite toute fragilisation ou détérioration à la longue du ciment. The rod thus shaped allows a wide distribution on the cement of the stresses exerted on it vertically and in rotation about its axis, which avoids any embrittlement or deterioration in the long run of the cement.

En effet, les contraintes verticales exercées sur la tête sphérique sont transmises au ciment par la paroi latérale extérieure large et à profil courbe de la tige : l'augmentation de la surface d'appui de la tige contre le ciment à cet endroit et l'élimination des angles vifs répartissent largement l'effort exercé. Les nervures participent également à la répartition sur le ciment des contraintes verticales mais leur forme courbée est plutôt destinée à permettre une résistance accrue du ciment aux contraintes s'exerçant en rotation, dont les directions sont plus ou moins perpendiculaires à l'axe de la tige dans la partie proximale de celle-ci, et ce, tout en facilitant la mise en place de la tige dans l'os. De plus, la position sur l'axe médian de la tige de deux des nervures leur permet d'agir avec un maximum d'efficacité dans la répartition des contraintes.En outre, grâce au bord libre arrondi des nervures, l'effort exercé est réparti sur le ciment sans risque de détérioration locale de celui-ci, comme cela est le cas en présence d'arêtes vives. In fact, the vertical stresses exerted on the spherical head are transmitted to the cement by the wide external side wall with a curved profile of the rod: the increase in the bearing surface of the rod against the cement at this point and the elimination of sharp angles widely distribute the force exerted. The ribs also participate in the distribution of the vertical stresses on the cement, but their curved shape is rather intended to allow increased resistance of the cement to the stresses exerted in rotation, the directions of which are more or less perpendicular to the axis of the rod. in the proximal part thereof, and this, while facilitating the introduction of the rod into the bone. In addition, the position on the median axis of the rod of two of the ribs allows them to act with maximum efficiency in the distribution of stresses. In addition, thanks to the free rounded edge of the ribs, the force exerted distributed over the cement without risk of local deterioration thereof, as is the case in the presence of sharp edges.

Les nervures et la paroi élargie et courbe de la tige coopèrent donc pour l'obtention d'une prothèse fixée avec ciment présentant une parfaite tenue dans le temps. The ribs and the widened and curved wall of the rod therefore cooperate in obtaining a prosthesis fixed with cement having perfect hold over time.

Avantageusement, la face extérieure de la nervure située du côté de la paroi latérale extérieure de la tige se trouve dans le prolongement de la face de ladite paroi. La surface de cette dernière est ainsi augmentée. Advantageously, the outer face of the rib located on the side of the outer lateral wall of the rod is in line with the face of said wall. The surface of the latter is thus increased.

Selon une forme de réalisation préférée de l'invention, la face de la paroi latérale extérieure de la tige ainsi que les bords libres des nervures situées le long de l'axe médian de la tige s'inscrivent dans un cercle centré sur ledit axe médian. According to a preferred embodiment of the invention, the face of the external lateral wall of the rod as well as the free edges of the ribs located along the median axis of the rod are inscribed in a circle centered on said median axis. .

Avantageusement, la base du col s'évase pour former une collerette de laquelle naissent les nervures, ces dernières décroissant ensuite progressivement en hauteur pour venir mourir approximativement au tiers de la longueur de la tige. Les nervures ne sont donc situées que sur la partie proximale de la tige subissant les contraintes précitées et inexistantes en dehors, ce qui évite que la tige exerce inutilement au niveau de sa partie distale une pression sur les corticales pouvant être douloureuse pour le patient. Ceci est, bien entendu, également le résultat de la parfaite résistance du ciment aux contraintes qu'il subit, résistance rendue possible grâce aux nervures et à la paroi élargie précitées. Advantageously, the base of the neck flares to form a collar from which the ribs are born, the latter then progressively decreasing in height to come to die approximately one third of the length of the stem. The ribs are therefore located only on the proximal part of the rod undergoing the abovementioned stresses and nonexistent outside, which prevents the rod unnecessarily exerting pressure on its cortices on the cortices which can be painful for the patient. This is, of course, also the result of the perfect resistance of the cement to the stresses which it undergoes, resistance made possible by the ribs and the aforementioned enlarged wall.

La partie distale de la tige est lisse, pour la même raison.  The distal part of the stem is smooth, for the same reason.

Par ailleurs, toujours pour éviter l'exercice d'efforts trop localisés, les angles de racccordement des nervures avec la tige sont arrondis et la paroi latérale intérieure présente un profil courbe, de préférence en arc de cercle. Furthermore, always to avoid the exercise of excessively localized forces, the angles of connection of the ribs with the rod are rounded and the inner side wall has a curved profile, preferably in an arc.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence au dessin schématique annexe représentant, à titre d'exemple non limitatif, une forme de réalisation préférée de la tige fémorale qu'elle concerne. In any case, the invention will be clearly understood with the aid of the description which follows, with reference to the accompanying diagrammatic drawing representing, by way of nonlimiting example, a preferred embodiment of the femoral stem which it concerns.

Figure 1 en est une vue de côté
Figure 2 en est une vue de dessus, selon la flèche de la figure 1 ; et
Figure 3 en est une vue à échelle agrandie et en coupe, selon III-III de figure 1.Figure 1 is a side view
Figure 2 is a top view, according to the arrow of Figure 1; and
Figure 3 is an enlarged view in section on III-III of Figure 1.

Les figures 1 et 2 représentent sous différents angles une tige fémorale 2 de prothèse de hanche. Figures 1 and 2 show from different angles a femoral stem 2 of hip prosthesis.

L'une des extrémités de la tige 2, dite "proximale", comporte une tête sphérique 3 raccordée à elle par un cou 4, destinée à être engagée et à pivoter dans une cavité correspondante ménagée dans un élément cotyloldien fixé à l'os illiaque, et son autre extrémité, dite "distale", est rectiligne et effilée pour son engagement dans le canal médullaire du fémur jusqu'à venue d'une collerette 5, située entre le cou 4 et la partie proximale de la tige 2, au contact de l'os. One of the ends of the rod 2, called "proximal", comprises a spherical head 3 connected to it by a neck 4, intended to be engaged and to pivot in a corresponding cavity formed in an acetabular element fixed to the iliac bone , and its other end, called "distal", is straight and tapered for its engagement in the medullary canal of the femur until coming from a collar 5, located between the neck 4 and the proximal part of the rod 2, in contact bone.

La tige 2 est destinée à être fixée à l'os à l'aide de ciment synthétique durcissable. The rod 2 is intended to be fixed to the bone using curable synthetic cement.

Dans la tige 2, et selon l'invention
- d'une part, chacune des faces principales 2a de la partie proximale de la tige 2 comporte deux nervures longitudinales courbes 10,11, qui suivent sensiblement la courbure des faces latérales 2b,2c de la tige 2 et qui s'étendent depuis la base du col 4 jusqu'à approximativement le tiers de la longueur de la tige 2, c'est-à-dire jusqu'à la naissance de la partie rectiligne de celle-ci, elle-même lisse,
- d'autre part, la paroi latérale extérieure est élargie et sa face 2b présente un profil courbe dans un plan perpendiculaire à l'axe de la tige 2.In rod 2, and according to the invention
- On the one hand, each of the main faces 2a of the proximal part of the rod 2 comprises two curved longitudinal ribs 10, 11, which substantially follow the curvature of the lateral faces 2b, 2c of the rod 2 and which extend from the base of the neck 4 up to approximately one third of the length of the stem 2, that is to say until the birth of the straight part of the latter, itself smooth,
- on the other hand, the outer side wall is widened and its face 2b has a curved profile in a plane perpendicular to the axis of the rod 2.

La figure 1 montre plus particulièrement que l'une, 10, des nervures 10,11 s'étend sensiblement le long de l'axe médian de la tige tandis que l'autre, 11, est située du côté de la paroi latérale extérieure de la tige 2. Figure 1 shows more particularly that one, 10, of the ribs 10,11 extends substantially along the median axis of the rod while the other, 11, is located on the side of the outer side wall of the rod 2.

La figure 2 montre que les nervures 10,11 naissent au niveau de la collerette 5 et décroissent ensuite progressivement en hauteur pour venir mourir, ainsi que précédemment indiqué, approximativement au tiers de la longueur de la tige 2. Les nervures 10 sont plus hautes que les nervures 11 du côté de la collerette 5 mais les nervures Il décroissent progressivement tandis que les nervures 10 décroissent de manière non uniforme, leur bord libre 10a présentant un profil concave en arc de cercle. Figure 2 shows that the ribs 10,11 arise at the flange 5 and then gradually decrease in height to come to die, as previously indicated, approximately one third of the length of the rod 2. The ribs 10 are higher than the ribs 11 on the side of the collar 5 but the ribs It decrease progressively while the ribs 10 decrease in a non-uniform manner, their free edge 10a having a concave profile in an arc of a circle.

La figure 3, quant à elle, montre que la face 2b et les bords libres 10a des nervures 10 s'inscrivent dans un cercle centré sur l'axe médian de la tige 2, que la face extérieure de la nervure 11 se trouve dans le prolongement de la face 2b et que les bords libres 1 Oa, 1 la ainsi que les angles de raccordement des nervures 10,11 avec la tige 2 sont arrondis. La paroi latérale intérieure 2c présente également un profil en arc de cercle. Figure 3, for its part, shows that the face 2b and the free edges 10a of the ribs 10 are inscribed in a circle centered on the median axis of the rod 2, that the outer face of the rib 11 is located in the extension of the face 2b and that the free edges 1a, 1a and the angles of connection of the ribs 10, 11 with the rod 2 are rounded. The inner side wall 2c also has a circular arc profile.

La tige 2 ainsi conformée permet une large répartition sur le ciment des contraintes s'exerçant sur elle verticalement et en rotation autour de son axe, ce qui évite toute fragilisation ou détérioration à la longue du ciment. The rod 2 thus shaped allows a wide distribution on the cement of the stresses exerted on it vertically and in rotation about its axis, which avoids any embrittlement or deterioration in the long run of the cement.

Les contraintes verticales sont transmises au ciment par la face 2b, donc au moyen d'une surface d'appui importante et sans angles vifs, et, partiellement, par les nervures 10 et 11. Les contraintes s'exerçant en rotation sont réparties sur le ciment par les nervures 10 et 11. L'arrondi de leurs bords libres et de leurs angles de raccordement à la tige 2, ainsi que le profil en arc de cercle de la paroi latérale intérieure 2c évitent tout effort localisé sur le ciment et donc élimine les risques de détérioration de celui-ci, notamment par fendillement. The vertical stresses are transmitted to the cement by the face 2b, therefore by means of a large bearing surface and without sharp angles, and, partially, by the ribs 10 and 11. The stresses exerted in rotation are distributed over the cement by the ribs 10 and 11. The rounding of their free edges and of their angles of connection to the rod 2, as well as the arcuate profile of the inner side wall 2c avoid any localized force on the cement and therefore eliminates the risks of deterioration thereof, in particular by cracking.

Claims (7)

REVENDICATIONS 1 - Tige fémorale de prothèse de hanche, du type ayant une forme courbée et comportant des nervures, caractérisée en ce que  1 - Femoral hip prosthesis stem, of the type having a curved shape and having ribs, characterized in that - d'une part, chacune des faces principales (2a) de la partie proximale de la tige (2) comporte deux nervures longitudinales courbes (10,11), dont le bord libre (lOa,lla) est arrondi, qui suivent sensiblement la courbure des faces latérales (2b,2c) de la tige (2) et qui s'étendent depuis la base du col (4) portant la tête sphérique (3) jusqu'à approximativement le tiers de la longueur de la tige (2), c'est-à-dire jusqu'à la naissance de la partie rectiligne de celle-ci, l'une (10) des nervures (10,11) s'étendant sensiblement le long de l'axe médian de la tige (2) tandis que l'autre (11) est située du côté de la paroi latérale extérieure de celle-ci, - On the one hand, each of the main faces (2a) of the proximal part of the rod (2) comprises two curved longitudinal ribs (10,11), whose free edge (lOa, lla) is rounded, which substantially follow the curvature of the lateral faces (2b, 2c) of the rod (2) and which extend from the base of the neck (4) carrying the spherical head (3) to approximately one third of the length of the rod (2) , that is to say until the birth of the straight part thereof, one (10) of the ribs (10,11) extending substantially along the median axis of the rod ( 2) while the other (11) is located on the side of the outer side wall thereof, - d'autre part, ladite paroi latérale extérieure est élargie et sa face (2b) présente un profil courbe dans un plan perpendiculaire à l'axe médian longitudinal de la tige (2). - On the other hand, said outer side wall is widened and its face (2b) has a curved profile in a plane perpendicular to the longitudinal median axis of the rod (2). 2 - Tige selon la revendication 1, caractérisée en ce que la face extérieure de la nervure (11) située du côté de la paroi latérale extérieure de la tige (2) se trouve dans le prolongement de la face (2b) de ladite paroi. 2 - Rod according to claim 1, characterized in that the outer face of the rib (11) located on the side of the outer lateral wall of the rod (2) is in the extension of the face (2b) of said wall. 3 - Tige selon la revendication 1 ou la revendication 2, caractérisée en ce que la face (2b) de la paroi latérale extérieure de la tige (2) ainsi que les bords libres (10a) des nervures (10) situées le long de l'axe médian de la tige (2) s'inscrivent dans un cercle centré sur ledit axe médian. 3 - Rod according to claim 1 or claim 2, characterized in that the face (2b) of the outer side wall of the rod (2) and the free edges (10a) of the ribs (10) located along the 'median axis of the rod (2) are part of a circle centered on said median axis. 4 - Tige selon l'une des revendications 1 à 3, caractérisée en ce que la base du col (4) s'évase pour former une collerette (5) de laquelle naissent les nervures (10,11), ces dernières décroissant ensuite progressivement en hauteur pour venir mourir approximativement au tiers de la longueur de la tige (2). 4 - Rod according to one of claims 1 to 3, characterized in that the base of the neck (4) flares to form a collar (5) from which the ribs (10,11) arise, the latter then decreasing gradually in height to die approximately one third of the length of the rod (2). 5 - Tige selon l'une des revendications 1 à 4, caractérisée en ce que la partie distale de la tige (2) est lisse. 5 - Rod according to one of claims 1 to 4, characterized in that the distal part of the rod (2) is smooth. 6 - Tige selon l'une des revendications 1 à 5, caractérisée en ce que les angles de raccordement des nervures (10,11) avec elle sont arrondis. 6 - Rod according to one of claims 1 to 5, characterized in that the angles of connection of the ribs (10,11) with it are rounded. 7 - Tige selon l'une des revendications 1 à 6, caractérisée en ce que sa paroi latérale intérieure (2c) présente un profil courbe, de préférence en arc de cercle.  7 - Rod according to one of claims 1 to 6, characterized in that its inner side wall (2c) has a curved profile, preferably in an arc.
FR9106611A 1991-05-16 1991-05-16 Femoral shaft for a hip prosthesis Granted FR2676359A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9106611A FR2676359A1 (en) 1991-05-16 1991-05-16 Femoral shaft for a hip prosthesis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9106611A FR2676359A1 (en) 1991-05-16 1991-05-16 Femoral shaft for a hip prosthesis

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FR2676359A1 true FR2676359A1 (en) 1992-11-20
FR2676359B1 FR2676359B1 (en) 1995-05-12

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761183A2 (en) * 1995-08-25 1997-03-12 Bristol-Myers Squibb Company Prosthetic implant with fins
WO1997046179A1 (en) * 1996-06-03 1997-12-11 Mathys Medizinaltechnik Ag Femur component for a hip endoprosthesis
WO1999021516A1 (en) * 1997-10-24 1999-05-06 Peter Brehm Shaft for a hip prosthesis
EP1070490A1 (en) * 1999-07-23 2001-01-24 Aesculap AG & Co. KG Stem for a hip prosthesis
EP1438932A1 (en) * 2003-01-17 2004-07-21 WALDEMAR LINK GmbH & Co. KG Hip prosthesis with stem for implantation into the femur
WO2004105654A1 (en) * 2003-05-29 2004-12-09 Curradini Giorgio E Femoral stem for hip prosthesis with macrostructures improvement

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027160A2 (en) * 1979-10-11 1981-04-22 GebràœDer Sulzer Aktiengesellschaft Hip joint prosthesis

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027160A2 (en) * 1979-10-11 1981-04-22 GebràœDer Sulzer Aktiengesellschaft Hip joint prosthesis

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761183A2 (en) * 1995-08-25 1997-03-12 Bristol-Myers Squibb Company Prosthetic implant with fins
EP0761183A3 (en) * 1995-08-25 1998-01-07 Bristol-Myers Squibb Company Prosthetic implant with fins
WO1997046179A1 (en) * 1996-06-03 1997-12-11 Mathys Medizinaltechnik Ag Femur component for a hip endoprosthesis
WO1999021516A1 (en) * 1997-10-24 1999-05-06 Peter Brehm Shaft for a hip prosthesis
EP1070490A1 (en) * 1999-07-23 2001-01-24 Aesculap AG & Co. KG Stem for a hip prosthesis
EP1438932A1 (en) * 2003-01-17 2004-07-21 WALDEMAR LINK GmbH & Co. KG Hip prosthesis with stem for implantation into the femur
WO2004064689A1 (en) * 2003-01-17 2004-08-05 Waldemar Link Gmbh & Co. Kg Hip prosthesis comprising a shaft to be inserted into the femur
AU2004206728B2 (en) * 2003-01-17 2009-03-26 Waldemar Link Gmbh & Co. Kg Hip prosthesis comprising a shaft to be inserted into the femur
US7914585B2 (en) 2003-01-17 2011-03-29 Waldemar Link Gmbh & Co. Kg Hip prosthesis including a shaft to be inserted into the femur
WO2004105654A1 (en) * 2003-05-29 2004-12-09 Curradini Giorgio E Femoral stem for hip prosthesis with macrostructures improvement

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