FR2678510A3 - Monobloc hip prosthesis - Google Patents

Monobloc hip prosthesis Download PDF

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Publication number
FR2678510A3
FR2678510A3 FR9108651A FR9108651A FR2678510A3 FR 2678510 A3 FR2678510 A3 FR 2678510A3 FR 9108651 A FR9108651 A FR 9108651A FR 9108651 A FR9108651 A FR 9108651A FR 2678510 A3 FR2678510 A3 FR 2678510A3
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FR
France
Prior art keywords
neck
rod
prosthesis
base
head
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.)
Withdrawn
Application number
FR9108651A
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French (fr)
Inventor
Jean-Pierre Gueguen
Yves Gueguen
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.)
GUEGUEN JEAN PIERRE
Original Assignee
GUEGUEN JEAN PIERRE
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Filing date
Publication date
Application filed by GUEGUEN JEAN PIERRE filed Critical GUEGUEN JEAN PIERRE
Priority to FR9108651A priority Critical patent/FR2678510A3/en
Publication of FR2678510A3 publication Critical patent/FR2678510A3/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • 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
    • 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
    • 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
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    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30153—Convex polygonal shapes rectangular
    • 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30158—Convex polygonal shapes trapezoidal
    • 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
    • A61F2002/30836—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves knurled
    • 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
    • A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
    • 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
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • 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
    • 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
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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
    • 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
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    • A61F2230/0019—Angular shapes rectangular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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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
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
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    • A61F2230/0026—Angular shapes trapezoidal
    • 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

This monobloc prosthesis comprises a shaft (4, 5) which is generally flat and which is connected to a hemispherical head (1) by way of a neck (3); according to the invention, the upper portion (4) of the shaft has lateral faces which widen towards the top, diverging in the direction of the neck (3), the length (L2) of this widened portion (4) being substantially equal to the distance (L1) which separates the centre (2) of the head from the base (6) of the neck.

Description

PROTHESE MONOBLOC DE LA HANCHE
La présente invention a pour objet une prothèse monobloc de la hanche. Elle a plus particulièrement pour objet une prothèse de hanche comprenant une tige généralement plate à bords arrondis qui est destinée à être implantée dans le canal centro-médullaire du fémur. La partie haute, c'est-à-dire située à l'extrémité proximale de la tige, est reliée par un col à une tête hémisphérique. Celle-ci est adaptée pour coopérer avec une coupelle (ou cotyle) de forme complémentaire concave fixée dans le bassin du patient afin de reconstituer l'articulation de la hanche.HIP MONOBLOCK PROSTHESIS
The present invention relates to a monobloc hip prosthesis. It relates more particularly to a hip prosthesis comprising a generally flat rod with rounded edges which is intended to be implanted in the central medullary canal of the femur. The upper part, that is to say located at the proximal end of the rod, is connected by a collar to a hemispherical head. This is adapted to cooperate with a cup (or cup) of concave complementary shape fixed in the patient's pelvis in order to reconstitute the hip joint.

Le scellement de la prothèse dans le canal est généralement, mais non nécessairement, assuré par l'intermédiaire d'un ciment. The sealing of the prosthesis in the canal is generally, but not necessarily, ensured by means of a cement.

Après implantation, il se developpe sur la prothèse de la hanche des efforts relativement élevés. Ceux-ci comprennent notamment des moments de flexion qui sont engendrés par l'appui du bassin sur la tete de prothèse. Ces efforts sont causes de microdéplacements de la tige de la prothèse par rapport à la paroi du canal centro-médullaire du fémur, ce qui peut provoquer un déscellement plus ou moins rapide de la prothèse. After implantation, it develops on the hip prosthesis relatively high efforts. These include in particular bending moments which are generated by the support of the pelvis on the prosthesis head. These efforts are the cause of microdisplacements of the stem of the prosthesis relative to the wall of the medullary canal of the femur, which can cause a more or less rapid loosening of the prosthesis.

L'invention vise à éviter ces inconvénients en améliorant très sensiblement, et avec des dispositions simples, la qualité de retenue de la prothèse dans le tissu osseux. The invention aims to avoid these drawbacks by very significantly improving, and with simple arrangements, the quality of retention of the prosthesis in the bone tissue.

Ce résultat est obtenu conformément à l'invention tout d'abord par le fait qu'on donne à la portion haute de la tige, c'est-à-dire la portion située vers l'extrémité proximale, juste à la base du col, une forme évasée, les deux faces latérales de ladite portion divergeant légèrement en direction du col (vers l'extrémité proximale). This result is obtained in accordance with the invention first of all by the fact that the upper portion of the rod is given, that is to say the portion situated towards the proximal end, just at the base of the neck , a flared shape, the two lateral faces of said portion diverging slightly towards the neck (towards the proximal end).

En second lieu, et complémentairement, il est apparu à la suite d'essais réalisés par les demandeurs, qu'il était important de prévoir que cette portion évasée s'étende sur une longueur limitée, longueur qui est sensiblement égale à la distance séparant le centre de la tête de la base du col. Un tel arrangement réalise en effet un compromis entre d'une part une bonne occupation, par la tige, du canal centro-médullaire du fémur et d'autre part une limitation du risque d'éclatement de l'os par effet de coin. Les moments de flexion qui se développent sur la prothèse se trouvent parfaitement répartis et régulièrement absorbés par la paroi du tissu osseux qui entoure la tige, notamment au niveau de la portion évasée. Secondly, and in addition, it appeared after tests carried out by the applicants, that it was important to provide that this flared portion extends over a limited length, length which is substantially equal to the distance separating the center of the head at the base of the neck. Such an arrangement in fact achieves a compromise between on the one hand a good occupation, by the rod, of the medullary canal of the femur and on the other hand a limitation of the risk of bursting of the bone by wedge effect. The bending moments which develop on the prosthesis are perfectly distributed and regularly absorbed by the wall of the bone tissue which surrounds the stem, in particular at the level of the flared portion.

Dans un mode de réalisation préférentiel, les faces latérales de la portion haute divergent non seulement vers le haut, mais également vers le côté, du bord interne vers le bord externe de la tige. Une telle disposition assure encore une meilleure occupation par la tige de prothèse de l'extrémité haute du canal centro-médullaire. In a preferred embodiment, the lateral faces of the upper portion diverge not only upwards, but also to the side, from the internal edge towards the external edge of the rod. Such an arrangement further ensures better occupancy by the prosthesis stem of the upper end of the central medullary canal.

Avantageusement, les faces latérales de la portion évasée possèdent des stries ou autres reliefs qui améliorent encore la retenue de la tige dans le tissu osseux. Advantageously, the lateral faces of the flared portion have ridges or other reliefs which further improve the retention of the rod in the bone tissue.

D'autres caractéristiques et avantages de l'invention apparaîtront de la description et des dessins annexés qui en présentent un mode de réalisation préférentiel. Other characteristics and advantages of the invention will appear from the description and the attached drawings which show a preferred embodiment.

Sur ces dessins
- la figure 1 est une vue de face d'une prothèse conforme à l'invention ;
- la figure 2 est une vue de côté (vue de gauche) de la prothèse de la figure 1
- les figures 1A et 1B sont des sections transversales de la tige de prothèse coupée respectivement par les plans AA et BB
- la figure 3 est une vue de coté partielle d'une variante de la prothèse des figures 1 et 2, dont la portion évasée est munie de stries. On these drawings
- Figure 1 is a front view of a prosthesis according to the invention;
- Figure 2 is a side view (left view) of the prosthesis of Figure 1
- Figures 1A and 1B are cross sections of the prosthesis rod cut respectively by the planes AA and BB
- Figure 3 is a partial side view of a variant of the prosthesis of Figures 1 and 2, the flared portion is provided with ridges.

La prothèse représentée sur les figures 1 et 2 est une prothèse de la hanche monobloc, par exemple en acier inoxydable. The prosthesis shown in FIGS. 1 and 2 is a one-piece hip prosthesis, for example made of stainless steel.

Elle comprend une tête hémisphérique 1, de centre 2, reliée par un col 3 à une tige 4, 5 généralement plate. On a désigné par la référence 6 la base du col, laquelle a une forme approximativement circulaire. La partie basse (partie distale) 5 de la tige a une épaisseur sensiblement constante ou légèrement effilée, convergeant vers l'extrémité distale. En vue de face, elle est effilée pour converger également vers l'extrémité distale, comme cela est bien connu et est visible à la figure 1. Les faces latérales de la portion 5, c'est-à-dire les faces parallèles au plan frontal, désignées 50 et 50', sont planes. Elles se raccordent aux deux bords interne 52 et externe 51 par des zones arrondies (voir figure 1B) comme cela est également bien connu.It comprises a hemispherical head 1, of center 2, connected by a neck 3 to a rod 4, 5 generally flat. The base of the neck, which has an approximately circular shape, has been designated by reference 6. The lower part (distal part) 5 of the rod has a substantially constant or slightly tapered thickness, converging towards the distal end. In front view, it is tapered to also converge towards the distal end, as is well known and is visible in Figure 1. The side faces of the portion 5, that is to say the faces parallel to the plane frontal, designated 50 and 50 ', are flat. They are connected to the two inner 52 and outer 51 edges by rounded zones (see FIG. 1B) as is also well known.

La base 6 du col 3 est reliée à la partie de tige 5 par une portion 4 qui a été représentée hachurée à la figure 1. Cette portion présente en vue de face une forme générale courbe puisqu'elle relie deux parties de la prothèse qui sont angulairement décalées. The base 6 of the neck 3 is connected to the stem part 5 by a portion 4 which has been shown hatched in FIG. 1. This portion has a generally curved shape in front view since it connects two parts of the prosthesis which are angularly offset.

La portion 4 possède des faces latérales 40, 40' qui divergent légèrement, de manière symétrique par rapport au plan frontal, vers le haut c'est-à-dire en direction de la base 6. The portion 4 has lateral faces 40, 40 ′ which diverge slightly, symmetrically with respect to the frontal plane, upwards, that is to say towards the base 6.

L'angle au sommet que forment entre elles les faces 40 et 40' est de quelques degrés, par exemple de 5 degrés.The angle at the top which the faces 40 and 40 'form between them is a few degrees, for example 5 degrees.

Comme on le voit à la figure lA, les faces latérales planes 40 et 40' divergent également légèrement, par exemple d'un angle de 2 à 30, du bord interne 42 vers le bord externe 41. De manière similaire à la partie 5, les faces 40 et 40' se raccordent par des zones arrondies aux bords interne 42 et externe 41. As can be seen in FIG. 1A, the flat lateral faces 40 and 40 ′ also diverge slightly, for example by an angle of 2 to 30, from the internal edge 42 towards the external edge 41. Similarly to part 5, the faces 40 and 40 ′ are connected by zones rounded to the internal 42 and external 41 edges.

A la figure 1 on a désigné par la référence L1 la distance qui sépare le centre 2 de la tête 1 de la base 6 du col 3. A titre indicatif, cette distance peut varier de 24 mm environ à 50 mm environ, selon les dimensions de la prothèse à laquelle on a affaire. In Figure 1 we have designated by the reference L1 the distance between the center 2 of the head 1 of the base 6 of the neck 3. As an indication, this distance can vary from approximately 24 mm to approximately 50 mm, depending on the dimensions of the prosthesis we are dealing with.

Selon une caractéristique essentielle de l'invention, la longueur moyenne de la portion évasée 4 (longueur prise le long de l'axe courbe de la prothèse), référencée L2 à la figure 1, est sensiblement égale à L1. According to an essential characteristic of the invention, the average length of the flared portion 4 (length taken along the curved axis of the prosthesis), referenced L2 in FIG. 1, is substantially equal to L1.

Dans la variante de prothèse représentée partiellement à la figure 3, la portion évasée 4 présente sur chacune de ses faces latérales une série de stries 7. Ceci améliore la retenue de la prothèse dans le canal centro-médullaire, comme cela est bien connu en soi. Il va de soi que les stries pourraient être remplacées par divers autres reliefs tels que des picots par exemple. In the variant of prosthesis partially shown in Figure 3, the flared portion 4 has on each of its lateral faces a series of ridges 7. This improves the retention of the prosthesis in the medullary canal, as is well known in itself . It goes without saying that the ridges could be replaced by various other reliefs such as spikes for example.

Bien entendu, comme dans le premier mode de réalisation, la longueur L1 est sensiblement égale à la longueur L2.  Of course, as in the first embodiment, the length L1 is substantially equal to the length L2.

Claims (3)

REVENDICATIONS 1. Prothèse monobloc de la hanche, qui comprend une tige (4, 5) généralement plate à bords arrondis destinée à être implantée dans le canal centro-médullaire du fémur, ainsi qu'une tête hémisphérique (1) reliée à la tige par l'intermédiaire d'un col (3), caractérisée par le fait que la portion haute (4) de la tige possède des faces latérales (40, 40') qui s'évasent vers le haut en divergeant en direction dudit col (3), cette portion évasée (4) s'étendant depuis la base du col (6) sur une longueur (L2) qui est sensiblement égale à la distance (L1) séparant le centre (2) de la tête (1) de la base (6) du col (3). 1. One-piece hip prosthesis, which comprises a generally flat rod (4, 5) with rounded edges intended to be implanted in the medullary canal of the femur, as well as a hemispherical head (1) connected to the rod by the 'intermediate a neck (3), characterized in that the upper portion (4) of the rod has side faces (40, 40') which widen upwards diverging in the direction of said neck (3) , this flared portion (4) extending from the base of the neck (6) over a length (L2) which is substantially equal to the distance (L1) separating the center (2) of the head (1) from the base ( 6) of the neck (3). 2. Prothèse selon la revendication 1, caractérisée par le fait que lesdites faces latérales (40, 40') divergent également du bord interne (42) vers le bord externe (41) de la tige. 2. Prosthesis according to claim 1, characterized in that said lateral faces (40, 40 ') also diverge from the internal edge (42) towards the external edge (41) of the rod. 3. Prothèse selon l'une des revendications 1 ou 2, caractérisée par le fait que lesdites faces latérales (40, 41) possèdent des stries (7) ou autres reliefs améliorant la retenue de la tige dans le tissu osseux.  3. Prosthesis according to one of claims 1 or 2, characterized in that said side faces (40, 41) have ridges (7) or other reliefs improving the retention of the rod in the bone tissue.
FR9108651A 1991-07-04 1991-07-04 Monobloc hip prosthesis Withdrawn FR2678510A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9108651A FR2678510A3 (en) 1991-07-04 1991-07-04 Monobloc hip prosthesis

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Application Number Priority Date Filing Date Title
FR9108651A FR2678510A3 (en) 1991-07-04 1991-07-04 Monobloc hip prosthesis

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Publication Number Publication Date
FR2678510A3 true FR2678510A3 (en) 1993-01-08

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FR9108651A Withdrawn FR2678510A3 (en) 1991-07-04 1991-07-04 Monobloc hip prosthesis

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FR (1) FR2678510A3 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0666069A1 (en) * 1994-02-04 1995-08-09 ITALPRO S.p.A. A prosthesis for implantation in the femur
WO1997042913A1 (en) * 1996-05-14 1997-11-20 Bruno Balay Cotyloidal implant fixed without cement
FR2767471A1 (en) * 1997-08-25 1999-02-26 Serf Sa Femoral shank of hip prosthesis
WO2007033727A1 (en) * 2005-09-20 2007-03-29 Plus Orthopedics Ag Blade-like shaft of a hip-joint prosthesis
GB2473184A (en) * 2009-08-27 2011-03-09 Biomet Uk Ltd A femoral neck prosthesis with trapezoidal cross-section
EP3016615A4 (en) * 2013-05-20 2017-04-12 Chitranjan S. Ranawat Femoral component for a hip prosthesis
GB2585397A (en) * 2019-11-28 2021-01-13 Matortho Ltd Ceramic monobloc femoral component, kit and system comprising the same, and method of manufacture and use thereof

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0666069A1 (en) * 1994-02-04 1995-08-09 ITALPRO S.p.A. A prosthesis for implantation in the femur
WO1997042913A1 (en) * 1996-05-14 1997-11-20 Bruno Balay Cotyloidal implant fixed without cement
US6231612B1 (en) 1996-05-14 2001-05-15 Bruno Balay Acetabular implant fixed without cement
FR2767471A1 (en) * 1997-08-25 1999-02-26 Serf Sa Femoral shank of hip prosthesis
US9498340B2 (en) 2005-09-20 2016-11-22 Smith & Nephew Orthopaedics Ag Blade-like stem of a hip-joint prosthesis
JP2009508545A (en) * 2005-09-20 2009-03-05 プラスオーソペディックス アーゲー Artificial hip joint blade stem
CN101267782B (en) * 2005-09-20 2012-08-22 Plus整形有限公司 Blade-like shaft of a hip-joint prosthesis
WO2007033727A1 (en) * 2005-09-20 2007-03-29 Plus Orthopedics Ag Blade-like shaft of a hip-joint prosthesis
US10064731B2 (en) 2005-09-20 2018-09-04 Smith & Nephew Orthopaedics Ag Blade-like shaft of a hip joint prosthesis
GB2473184A (en) * 2009-08-27 2011-03-09 Biomet Uk Ltd A femoral neck prosthesis with trapezoidal cross-section
GB2473184B (en) * 2009-08-27 2014-09-03 Biomet Uk Ltd A femoral neck prosthesis
EP3016615A4 (en) * 2013-05-20 2017-04-12 Chitranjan S. Ranawat Femoral component for a hip prosthesis
GB2585397A (en) * 2019-11-28 2021-01-13 Matortho Ltd Ceramic monobloc femoral component, kit and system comprising the same, and method of manufacture and use thereof
GB2585397B (en) * 2019-11-28 2021-09-01 Matortho Ltd Ceramic monobloc femoral component, kit and system comprising the same, and method of manufacture and use thereof

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