FR2549718A1 - Self-immobilising femoral rod for hip prosthesis - Google Patents

Self-immobilising femoral rod for hip prosthesis Download PDF

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Publication number
FR2549718A1
FR2549718A1 FR8312835A FR8312835A FR2549718A1 FR 2549718 A1 FR2549718 A1 FR 2549718A1 FR 8312835 A FR8312835 A FR 8312835A FR 8312835 A FR8312835 A FR 8312835A FR 2549718 A1 FR2549718 A1 FR 2549718A1
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France
Prior art keywords
rod
grooves
femoral stem
longitudinal
self
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FR8312835A
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French (fr)
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Individual
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Individual
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Priority to FR8312835A priority Critical patent/FR2549718A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—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
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30136—Rounded shapes, e.g. with rounded corners undulated or wavy, e.g. serpentine-shaped or zigzag-shaped
    • 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
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30153—Convex polygonal shapes rectangular
    • 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
    • A61F2002/30878—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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • 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
    • 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
    • A61F2230/0017—Angular shapes
    • A61F2230/0019—Angular shapes rectangular
    • 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

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The subject of the invention belongs to the field of prostheses in general and in particular hip prostheses. The rod according to the invention is notable in that its longitudinal part 1c for engaging in the medullary canal of the femur has multiple grooves 1d or 1g-1h which have different directions in the longitudinal area of the face or faces or longitudinal shapes of the said rod, so as to engender, under the pressures which are applied to the rod, directional forces which act against each other while self-immobilising the rod. The invention applies to femoral rods of all types and sizes.

Description

L'invention a pour objet une tige fémorale autoimmobilisante, pour prothèse de hanche. The subject of the invention is a self-immobilizing femoral rod, for hip prosthesis.

L'objet de l'invention se rattache au secteur technique des prothèses en général, et plus particulièrement des prothèses de hanche. The object of the invention relates to the technical sector of prostheses in general, and more particularly hip prostheses.

On connaît bien les tiges fémorales pour prothèses de hanche. Ces tiges ou broches sont engagées dans le canal médullaire du fémur, où elles doivent être fixées. Cette fixation peut s'opérer en utilisant des ciments spéciaux, mais le procédé présente certains inconvénients. Pour la fixation non cimentées de tiges fémorales, un moyen consiste à former quelques cannelures longitudinales dans le sens de la tige. Ces cannulures sont destinées à favoriser la réhabilitation osseuse, c'est-à-dire la régénérescence des parties du fémur dans les cannelures, en donnant une liaison étroite et en quelque sorte naturelle, entre le fémur et la tige. We know well the femoral stems for hip prostheses. These rods or pins are engaged in the medullary canal of the femur, where they must be fixed. This fixing can be done using special cements, but the process has certain drawbacks. For the cementless attachment of femoral stems, one way is to form a few longitudinal grooves in the direction of the stem. These cannulations are intended to promote bone rehabilitation, that is to say the regeneration of the parts of the femur in the grooves, giving a close and somewhat natural connection between the femur and the stem.

Ces tiges à cannelures longitudinales présentent cependant un important inconvénient par le fait que les cannelures induisent un effet de piston de la tige dans la matière osseuse fémorale. Cet effet de piston est connu. Il oblige, lorsqu'on met en place la prothèse, à immobiliser le patient longuement jusqu'à ce que la régénérescence osseuse ait assuré l'immobi- lisation de la tige. Malgré cela, lors de mouvements au début du port de la prothèse, ou par la suite sous des efforts importants subis par la prothèse, ou bien par la répététivité d'efforts de poussée sur la tige, l'effet de piston désolidarise la tige de la matière osseuse. Il se produit un faible déplacement en va et vient, du type piston, qui présente des inconvénients et effets fâcheux comme on le voit bien, en obligeant à procéder à de nouvelles interventions. These rods with longitudinal grooves, however, have a significant drawback in that the grooves induce a piston effect of the rod in the femoral bone material. This piston effect is known. When the prosthesis is put in place, it requires the patient to be immobilized for a long time until bone regeneration has ensured immobilization of the stem. Despite this, during movements at the start of wearing the prosthesis, or thereafter under significant stresses undergone by the prosthesis, or else by the repetitive thrust forces on the rod, the piston effect separates the rod from bone material. There is a slight displacement back and forth, of the piston type, which has drawbacks and unfortunate effects as can be seen, by forcing to carry out new interventions.

Pour remédier à ces inconvénients, la tige fémorale auto-immosibisante suivant l'invention est caractérisée en ce que sa partie longitudinale d'engagement dans le canal médullaire du fémur, présente des cannelures multiples qui ont des directions différentes dans l'étendue longitudinale de la ou des faces ou formes longitudinales de la dite tige, de façon à engendrer, sous les poussées qui s'appliquent à la tige, des effets directionnels qui se contrarient en auto-immobilisant la tige. To overcome these drawbacks, the self-absorbing femoral stem according to the invention is characterized in that its longitudinal part of engagement in the medullary canal of the femur, has multiple grooves which have different directions in the longitudinal extent of the or of the longitudinal faces or forms of said rod, so as to generate, under the thrusts which apply to the rod, directional effects which contradict each other by self-immobilizing the rod.

Ces caractéristiques et d'autres encore ressortiront de la description qui suit.  These characteristics and others will emerge from the description which follows.

Pour fixer l'objet de l'invention, sans toutefois le limiter, dans le dessin annexé
La figure 1 est une vue de face montrant un exemple de réalisation de la tige fémorale suivant l'invention.To fix the object of the invention, without however limiting it, in the attached drawing
Figure 1 is a front view showing an embodiment of the femoral stem according to the invention.

La figure 2 est une vue de face montrant un autre exemple de réalisation de la tige fémorale suivant l'invention. Figure 2 is a front view showing another embodiment of the femoral stem according to the invention.

La figure 3 est une vue illustrant la tige fémorale implantée dans un fémur. Figure 3 is a view illustrating the femoral stem implanted in a femur.

La figure 4 est une vue en coupe à plus grande échelle considérée suivant la ligne 4-4 de la figure 3. Figure 4 is an enlarged sectional view taken along line 4-4 of Figure 3.

Afin de rendre plus concret l'objet de l'invention, on le décrit maintenant sous des formes non limitatives de réalisation illustrées aux figures des dessins. In order to make the object of the invention more concrete, it is now described in nonlimiting embodiments illustrated in the figures of the drawings.

La tige fémorale (1) présente de manière connue une platine (la) avec une tête (lb) conformée pour s'adapter dans une pièce complémentaire du type cupule. The femoral stem (1) has in a known manner a plate (la) with a head (lb) shaped to fit in a complementary part of the cup type.

La tige proprement dite (lc) présente-sur toute sa surface ou sensiblement, et au moins suivant ses grandes faces dans le cas de tige méplate en section, des cannelures multiples (ld) qui ont des directions différentes dans l'étendue longitudinale de la ou des faces ou formes longitudinales de la tige. The rod proper (lc) has-over its entire surface or substantially, and at least along its large faces in the case of flattened rod in section, multiple grooves (ld) which have different directions in the longitudinal extent of the or longitudinal faces or shapes of the rod.

Dans l'exemple illustré à la figure 1, les cannelures multiples sont continues dans la longueur de la tige depuis la platine jusqu'à lsextrémité, avec au moins un changement de direction des cannelures dans la longueur. Par exemple, les cannelures partent du chant extérieur convexe (le) et forment des courbes parallèles pour s'étendre d'une manière sensiblement parallèle à l'axe longitudinal (x - x) de la tige. In the example illustrated in FIG. 1, the multiple grooves are continuous in the length of the rod from the plate to the end, with at least one change of direction of the grooves in the length. For example, the grooves start from the convex outer edge (le) and form parallel curves to extend in a manner substantially parallel to the longitudinal axis (x - x) of the rod.

Selon l'exemple illustré à la figure 2, les cannelures multiples sont discontinues dans la longueur de la tige depuis la platine jusqu'à l'extrémité, avec au moins un changement de direction. Par exemple, des cannelures (lg) sont formées d'une manière rectiligne et inclinée entre le chant extérieur (le) et le chant intérieur (lof) dans leur partie courbe située immédiatement après la platine. Puis des cannelures (lh) sont formées d'une manière rectiligne entre les cannelures inclinées (lg) et l'extrémité de la tige, et selon une direction sensiblement parallèle à l'axe longitudinal (x - x).  According to the example illustrated in Figure 2, the multiple grooves are discontinuous in the length of the rod from the plate to the end, with at least one change of direction. For example, grooves (lg) are formed in a rectilinear manner and inclined between the outer edge (le) and the inner edge (lof) in their curved part located immediately after the plate. Then grooves (lh) are formed in a rectilinear manner between the inclined grooves (lg) and the end of the rod, and in a direction substantially parallel to the longitudinal axis (x - x).

Les cannelures continues ou discontinues sont établies à un pas (p) réduit ou fin, de l'ordre de 1 à 2 mm mais non limitativement, et les sommets et les fonds de cannelures sont de préférence largement arrondis afin d'être non agressifs lors de l'implantation dans le canal médullaire, comme le montrent les figures 3 et 4. Continuous or discontinuous grooves are established at a reduced or fine pitch (p), of the order of 1 to 2 mm but not limited to, and the tops and bottoms of grooves are preferably largely rounded in order to be non-aggressive during implantation in the spinal canal, as shown in Figures 3 and 4.

Le changement de direction des cannelures continues ou discontinues intervient de préférence au tiers de la longueur en partant de la platine. Cependant, il n'est pas exclu qu'il soit prévu plus haut ou plus bas selon les cas particuliers d'implantation. The change in direction of continuous or discontinuous grooves occurs preferably at one third of the length from the plate. However, it is not excluded that it is provided higher or lower depending on the specific cases of implementation.

D'autre part, on peut prévoir plusieurs changements de direction des cannelures en continu ou de manière discontinue. On the other hand, several changes of direction of the grooves can be provided continuously or discontinuously.

D'une manière préférée quoique non limitative, les cannelures sont réalisées avantageusement par électro-érosion, sans exclure d'autres moyens tels que fraisage par reproduction, moulage si le matériau utilisé le permet. In a preferred although not limiting manner, the grooves are advantageously made by electro-erosion, without excluding other means such as milling by reproduction, molding if the material used allows it.

D'une façon importante, il faut noter que la géométrie de la tige est pas modifiée et que l'on peut exécuter les cannelures sur toutes formes de tiges. Importantly, it should be noted that the geometry of the rod is not changed and that the grooves can be made on all forms of rods.

A noter encore que les cannelures peuvent être exécutées seulement sur les deux grandes faces de la tige, ou encore sur deux faces opposées. Note also that the grooves can be executed only on the two large faces of the rod, or on two opposite faces.

Les avantages ressortent bien de la description, on souligne encore
La suppression de l'effet de piston ou de va et vient de la tige dans le canal médullaire par les effets directionnels qui se contrarient en auto-immobilisant la tige, tout en conservant la possibilité d'extraction éventuelle.The advantages are clear from the description, it is further emphasized
The suppression of the piston or back and forth effect of the rod in the medullary canal by the directional effects which counteract by self-immobilizing the rod, while preserving the possibility of possible extraction.

L'invention ne se limite aucunement à celui de ses modes d'application non plus qu'à ceux des modes de réalisation de ses diverses parties ayant plus spécialement été indiquées elle en embrasse au contraire toutes les variantes.  The invention is in no way limited to that of its modes of application any more than to those of the embodiments of its various parts having been more especially indicated, on the contrary it embraces all variants.

Claims (2)

REVENDICATIONS -1- Tige fémorale auto-immobilisante, pour prothèse de hanche, caractérisée en ce que sa partie longitudinale (lc) d'engagement dans le canal médullaire du fémur, présente des cannelures multiples (ld) ou (lg - 1h) qui ont des directions différentes dans l'étendue longitudinale de la ou des faces ou formes longitudinales de ladite tige, de façon à engendrer, sous les poussées qui s'appliquent à la tige, des effets directionnels qui se contrarient en auto-immobilisant la tige.-1- Self-immobilizing femoral stem, for hip prosthesis, characterized in that its longitudinal part (lc) of engagement in the medullary canal of the femur, has multiple grooves (ld) or (lg - 1h) which have different directions in the longitudinal extent of the longitudinal face (s) or forms of said rod, so as to generate, under the thrusts which apply to the rod, directional effects which contradict each other by self-immobilizing the rod. -2- Tige fémorale suivant la revendication 1, caractérisée en ce que les cannelures multiples (ld - lg - 1h) sont formées sur toute la longueur de la tige, depuis la platine jusqu'à l'extrémité, et tout autour de la tige -3- Tige fémorale suivant la revendication 1, caractérisé en ce que les cannelures multiples (ld - lg - 1h) sont formées seulement sur tout ou partie des faces longitudinales -4- Tige fémorale suivant la revendiration l, caractérisée en ce que les cannelures multiples (ld) sont continues dans la longueur de la tige depuis la platine jusqu'à l'extrémité, avec au moins un changement de direction des cannelures dans la longueur.-2- Femoral stem according to claim 1, characterized in that the multiple splines (ld - lg - 1h) are formed over the entire length of the stem, from the plate to the end, and all around the stem -3- Femoral stem according to claim 1, characterized in that the multiple splines (ld - lg - 1h) are formed only on all or part of the longitudinal faces -4- Femoral stem according to the claim l, characterized in that the splines multiples (ld) are continuous in the length of the rod from the plate to the end, with at least one change of direction of the grooves in the length. -5- Tige fémorale suivant la revendication 1, caractérisée en ce que les cannelur,es multiples (lg - 1h) sont discontinues, et sont formées d'au moins deux séries ; une première série étant exécutée pour s'étendre selon une direction, et une deuxième série étant exécutée pour s'étendre selon une direction différente, en formant un angle avec les cannelures de la première série et à la suite de ces dernières.-5- Femoral stem according to claim 1, characterized in that the grooves, are multiple (lg - 1h) are discontinuous, and are formed of at least two series; a first series being executed to extend in a direction, and a second series being executed to extend in a different direction, at an angle with the grooves of the first series and following these. -6- Tige fémorale suivant la revendication 1, caractérisée en ce que le changement de direction des cannelures continues ou discontinues (ld - lg - 1h) intervient sensiblement au tiers de la longueur de la tige en partant de la platine. -6- Femoral stem according to claim 1, characterized in that the change of direction of the continuous or discontinuous grooves (ld - lg - 1h) occurs substantially at one third of the length of the stem starting from the plate. -7- Tige fémorale suivant la revendication 1, caractérisé en ce en ce que le fond et le sommet des cannelures multiples continues ou discontinues sont largement arronds pour éviter tout accrochage lors de l'implantation, et pour permettre une extraction éventuelle.-7- Femoral stem according to claim 1, characterized in that the bottom and the top of the continuous or discontinuous multiple grooves are largely rounded to avoid any snagging during implantation, and to allow possible extraction. -8- Tige fémorale suivant la revendication 1, caractérisée en ce que les cannelures multiples continues ou discontinues sont établies à un pas fin de l'ordre de 1 à 2 mm. -8- Femoral stem according to claim 1, characterized in that the multiple continuous or discontinuous splines are established at a fine pitch of the order of 1 to 2 mm.
FR8312835A 1983-07-29 1983-07-29 Self-immobilising femoral rod for hip prosthesis Pending FR2549718A1 (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4865608A (en) * 1987-11-20 1989-09-12 Brooker Jr Andrew F Grooved endoprosthesis
FR2637494A1 (en) * 1988-10-06 1990-04-13 Legre Gerard Femoral element for a hip endoprosthesis
EP0368796A1 (en) * 1988-10-19 1990-05-16 Mecron Medizinische Produkte Gmbh Process for manufacturing a shaft prosthesis
EP0378044A1 (en) * 1989-01-10 1990-07-18 GebràœDer Sulzer Aktiengesellschaft Flat stem for a femoral head prosthesis
US5002580A (en) * 1988-10-07 1991-03-26 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation
US5062854A (en) * 1988-10-07 1991-11-05 Pfizer Hospital Products Group Prosthetic device and method of implantation
US5147408A (en) * 1988-10-07 1992-09-15 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation
FR2680315A1 (en) * 1991-08-12 1993-02-19 Implants Instr Ch Fab Femoral stem for hip joint
EP0532439A2 (en) * 1991-09-13 1993-03-17 Impact Acetabular cup for hip prosthesis
FR2781363A1 (en) * 1998-07-24 2000-01-28 Michel Henry Fessy Cup for surgical hip prosthesis has shell with outer channelled surface to anchor in bone
FR2794639A1 (en) * 1999-06-08 2000-12-15 I S C Hip prosthesis femoral implant shank has at least one proximal section groove with discontinuous lengthwise surface
WO2004064688A1 (en) * 2003-01-17 2004-08-05 Waldemar Link Gmbh & Co. Kg Hip prosthesis comprising a shaft to be fixed in the medullary canal of 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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2290882A1 (en) * 1974-11-14 1976-06-11 Howmedica INTRA-FEMORAL PROSTHESIS FOR COXO-FEMORAL JOINT
FR2295730A1 (en) * 1974-12-24 1976-07-23 Friedrichsfeld Gmbh FEMORAL PART OF TOTAL HIP JOINT ENDOPROTHESIS
GB2028137A (en) * 1978-08-04 1980-03-05 Friedrichsfeld Gmbh Femur component of an endocoxal prosthesis
DE3003050A1 (en) * 1980-01-25 1981-07-30 Mecron Medizinische Produkte Gmbh, 1000 Berlin Collar-less hip joint, prosthesis - has teeth on shank portion fitting inside bone, particularly on top half

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2290882A1 (en) * 1974-11-14 1976-06-11 Howmedica INTRA-FEMORAL PROSTHESIS FOR COXO-FEMORAL JOINT
FR2295730A1 (en) * 1974-12-24 1976-07-23 Friedrichsfeld Gmbh FEMORAL PART OF TOTAL HIP JOINT ENDOPROTHESIS
GB2028137A (en) * 1978-08-04 1980-03-05 Friedrichsfeld Gmbh Femur component of an endocoxal prosthesis
DE3003050A1 (en) * 1980-01-25 1981-07-30 Mecron Medizinische Produkte Gmbh, 1000 Berlin Collar-less hip joint, prosthesis - has teeth on shank portion fitting inside bone, particularly on top half

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4865608A (en) * 1987-11-20 1989-09-12 Brooker Jr Andrew F Grooved endoprosthesis
FR2637494A1 (en) * 1988-10-06 1990-04-13 Legre Gerard Femoral element for a hip endoprosthesis
US5002580A (en) * 1988-10-07 1991-03-26 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation
US5147408A (en) * 1988-10-07 1992-09-15 Pfizer Hospital Products Group, Inc. Prosthetic device and method of implantation
US5062854A (en) * 1988-10-07 1991-11-05 Pfizer Hospital Products Group Prosthetic device and method of implantation
EP0368796A1 (en) * 1988-10-19 1990-05-16 Mecron Medizinische Produkte Gmbh Process for manufacturing a shaft prosthesis
US4944761A (en) * 1989-01-10 1990-07-31 Sulzer Brothers Limited Blade-like stem for a femoral head prosthesis
CH676664A5 (en) * 1989-01-10 1991-02-28 Sulzer Ag
EP0378044A1 (en) * 1989-01-10 1990-07-18 GebràœDer Sulzer Aktiengesellschaft Flat stem for a femoral head prosthesis
FR2680315A1 (en) * 1991-08-12 1993-02-19 Implants Instr Ch Fab Femoral stem for hip joint
EP0532439A2 (en) * 1991-09-13 1993-03-17 Impact Acetabular cup for hip prosthesis
FR2681238A1 (en) * 1991-09-13 1993-03-19 Impact COTYL FOR PROTHESIS OF HIP.
EP0532439A3 (en) * 1991-09-13 1993-04-28 Impact Acetabular cup for hip prosthesis
FR2781363A1 (en) * 1998-07-24 2000-01-28 Michel Henry Fessy Cup for surgical hip prosthesis has shell with outer channelled surface to anchor in bone
FR2794639A1 (en) * 1999-06-08 2000-12-15 I S C Hip prosthesis femoral implant shank has at least one proximal section groove with discontinuous lengthwise surface
WO2004064688A1 (en) * 2003-01-17 2004-08-05 Waldemar Link Gmbh & Co. Kg Hip prosthesis comprising a shaft to be fixed in the medullary canal of the femur
US7559950B2 (en) 2003-01-17 2009-07-14 Waldemar Link Gmbh & Co. Kg Hip prosthesis including a shaft to be fixed in the medullary canal of 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

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