FR2580171A1 - Femoral part for hip joint prosthesis - Google Patents

Femoral part for hip joint prosthesis Download PDF

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Publication number
FR2580171A1
FR2580171A1 FR8505651A FR8505651A FR2580171A1 FR 2580171 A1 FR2580171 A1 FR 2580171A1 FR 8505651 A FR8505651 A FR 8505651A FR 8505651 A FR8505651 A FR 8505651A FR 2580171 A1 FR2580171 A1 FR 2580171A1
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Prior art keywords
femoral
cephalic
well
engaged
intended
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FR8505651A
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French (fr)
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FR2580171B1 (en
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Individual
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Priority to FR8505651A priority Critical patent/FR2580171B1/en
Priority to CA000506173A priority patent/CA1283251C/en
Priority to BR8601592A priority patent/BR8601592A/en
Publication of FR2580171A1 publication Critical patent/FR2580171A1/en
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Publication of FR2580171B1 publication Critical patent/FR2580171B1/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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/30538—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation
    • A61F2002/3054—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
    • 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
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/30797—Blind bores, e.g. of circular cross-section internally-threaded
    • 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
    • A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
    • 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
    • A61F2002/3652—Connections of necks to 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws

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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 femoral part is of the type comprising two elements 2, 3, a femoral element 2 essentially formed by a threaded rod 4 intended to be engaged in the medullary canal 5 of the femur 6, and a cephalic element 3 supporting a sphere 12, 13, which can be fitted to the end of the femoral part 2 and is intended to bear in the acetabulum or in a cup fixed to the cotyle. The bearing face 7a of the femoral part 2 carries, at its centre, that is to say coaxially with its flange 7, a boss 8 for centring and guiding the cephalic element 3, at the centre of which a tapped hole 8a is made and, at the centre of the bearing face 14 of the cephalic element 3, there is made a well 16 of profile complementary to that of the boss 8 and onto which it is intended to be engaged, the bottom of this well 16 being extended by a coaxial bore 19 provided for the threaded rod of the assembly 21 to pass and for housing and retaining the head 21a of this screw 21.

Description

"Partie fémorale de prothèse pour articulation de la hanche"
La présente invention concerne une partie fémorale de prothèse pour articulation de la hanche."Femoral part of prosthesis for hip joint"
The present invention relates to a femoral part of a hip joint prosthesis.

On connaît par le brevet français 2 481 596 une partie fémorale de prothèse pour articulation de la hanche du type comportant deux éléments aptes à être fixés l'un à l'autre, à savoir, un élément fémoral formé essentiellement d'une tige filetée destinée à être engagée dans le canal médullaire du fémur considéré et un élément céphalique supportant une sphère, adaptable à l'extrémité de la partie fémorale non engagée dans le fémur, cette sphère étant destinée à être engagée et à prendre appui soit directement dans la cavité cotyloldienne de la hanche correspondante, soit dans une cupule préalablement fixée au cotyle. French patent 2,481,596 discloses a femoral part of a hip joint prosthesis of the type comprising two elements capable of being fixed to one another, namely, a femoral element formed essentially of a threaded rod intended to be engaged in the medullary canal of the femur considered and a cephalic element supporting a sphere, adaptable to the end of the femoral part not engaged in the femur, this sphere being intended to be engaged and to bear either directly in the acetabular cavity of the corresponding hip, either in a cup previously attached to the acetabulum.

Dans cette partie fémorale, l'extrémité de l'élément fémoral non engagée dans le canal médullaire du fémur porte une collerette coaxiale à la tige, dont la face inférieure est destinée à prendre appui contre l'extrémité réséquée du fémur, dont la face supérieure est destinée à servir de face d'appui à l'élément céphalique et qui est munie de moyens pour permettre son entraînement en rotation lors de son vissage, et il est prévu au moins un ergot porté par la face d'appui de l'élément céphalique et une rangée circulaire de trous de profil complémentaire de celui de l'ergot, ménagés le long du bord de la collerette de l'élément fémoral et dans l'un choisi desquels peut être engagé l'ergot précité avant l1assem- blage de l'élément céphalique à l'élément fémoral. In this femoral part, the end of the femoral element not engaged in the medullary canal of the femur carries a collar coaxial with the rod, the lower face of which is intended to bear against the resected end of the femur, the upper face of which is intended to serve as a bearing face for the cephalic element and which is provided with means to allow its drive in rotation when it is screwed, and at least one lug is provided carried by the bearing face of the element cephalic and a circular row of holes with a profile complementary to that of the lug, arranged along the edge of the flange of the femoral element and in one chosen from which the aforementioned lug can be engaged before the assembly of the cephalic element to the femoral element.

Suivant une caractéristique de ce brevet, les moyens pour l'assemblage de l'élément céphalique à l'élément fémoral comprennent, dans l'élément fémoral, un alésage conique à faible pente, coaxial à la tige et débouchant dans l'extrémité de celle-ci non engagée dans le canal médullaire du fémur et, dans l'élément céphalique, en saillie sur sa face d'appui contre l'extrémité précitée de l'élément fémoral, une tige conique de profil complémentaire de l'alésage conique de l'élément fémoral, et permettant la solidarisation des deux éléments par simple coincement mutuel résultant de la faible pente des cônes. According to a characteristic of this patent, the means for assembling the cephalic element to the femoral element comprise, in the femoral element, a conical bore with a slight slope, coaxial with the rod and opening into the end of that -this not engaged in the medullary canal of the femur and, in the cephalic element, projecting on its bearing face against the abovementioned end of the femoral element, a conical rod of profile complementary to the conical bore of the 'femoral element, and allowing the joining of the two elements by simple mutual wedging resulting from the low slope of the cones.

Cette dispositon présente l'inconvénient de ne pas permettre d'améliorer facilement les conditions d'assemblage de ces deux éléments à l'aide d'une vis car, celle-ci doit être décentrée par rapport à l'axe de la tige conique de l'élément céphalique et, par conséquent, par rapport à la tige d'ancrage de l'élément fémoral. Il en résulte que la prévision d'une vis d'assemblage exige une augmentation des diamètres des deux éléments dans leur zone d'assemblage, c'est-à-dire à proximité de leurs faces d'appui, ce qui entraîne, évidemment, une résection plus importante du grand trochanter. This arrangement has the drawback of not making it possible to easily improve the conditions of assembly of these two elements using a screw because, this must be offset relative to the axis of the conical rod of the cephalic element and, therefore, relative to the anchor rod of the femoral element. As a result, the provision of an assembly screw requires an increase in the diameters of the two elements in their assembly area, that is to say near their bearing faces, which obviously results in greater resection of the greater trochanter.

La présente invention vise à remédier à cet inconvénient. A cet effet, dans la partie fémorale de prothèse de la hanche qu'elle concerne, et qui est du type précité, la face d'appui de l'élément fémoral porte, en son centre, c'est-à-dire coaxialement à sa collerette, un bossage de centrage et de guidage de l'élément céphalique, au centre duquel est aménagé un trou taraudé et, au centre de la face d'appui de l'élément céphalique, est ménagé un puits de profil complémentaire de celui du bossage de l'élément fémoral et sur lequel il est destiné à être engagé, le fond de ce puits étant prolongé par un alésage coaxial prévu pour le passage de la tige filetée d'une vis d'assemblage et le logement et la retenue de la tête de cette vis. The present invention aims to remedy this drawback. To this end, in the femoral part of the hip prosthesis which it concerns, and which is of the aforementioned type, the bearing face of the femoral element carries, in its center, that is to say coaxially with its collar, a boss for centering and guiding the cephalic element, at the center of which is a tapped hole and, at the center of the bearing face of the cephalic element, a well of profile complementary to that of the boss of the femoral element and on which it is intended to be engaged, the bottom of this well being extended by a coaxial bore provided for the passage of the threaded rod of a connecting screw and the housing and the retention of the head of this screw.

Cette disposition facilite donc considérablement la pose de la prothèse puisqu'au cours du vissage de l'élément fémoral la position de la vis d'assemblage ne varie pas et son vissage dans le bossage de l'élé- ment fémoral n'exige aucun surdimensionnement de cet élément. This arrangement therefore considerably facilitates the fitting of the prosthesis since during the screwing of the femoral element the position of the assembly screw does not vary and its screwing in the boss of the femoral element does not require any oversizing. of this element.

Le bossage prévu sur l'élément fémoral pour le centrage et le guidage de l'élément céphalique, ainsi que le puits ménagé dans ce dernier pour le recevoir, peuvent être cylindriques. Cependant, ils sont avantageusement tronconiques à faible pente pour participer à l'assemblage de ces deux éléments par coincement réciproque en fin d'engagement de l'un dans l'autre. The boss provided on the femoral element for centering and guiding the cephalic element, as well as the well formed in the latter to receive it, can be cylindrical. However, they are advantageously frustoconical with a slight slope to participate in the assembly of these two elements by mutual wedging at the end of engagement of one in the other.

Pour améliorer encore la tenue de cet assemblage, suivant une disposition avantageuse de l'invention, la partie de l'alésage ménagé coaxialement au puits de l'élément céphalique pour loger et retenir la tête de la vis, ainsi que la tête de cette dernière, sont tronconiques à faible pente pour permettre leur liaison par coincement réciproque en fin de vissage. To further improve the behavior of this assembly, according to an advantageous arrangement of the invention, the part of the bore formed coaxially with the well of the cephalic element to accommodate and retain the head of the screw, as well as the head of the latter , are tapered with a slight slope to allow their connection by mutual wedging at the end of screwing.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence à l'unique figure du dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme d'exécution de cette partie fémorale de prothèse pour articulation de la hanche, vue en coupe axiale. Anyway, the invention will be well understood with the aid of the description which follows, with reference to the single figure of the appended schematic drawing representing, by way of nonlimiting example, an embodiment of this femoral part prosthesis for hip joint, viewed in axial section.

Comme indiqué précédemment, cette partie de prothèse est du type comprenant essentiellement deux éléments, à savoir un élément fémoral (2) et un élément céphalique (3). As indicated above, this prosthesis part is of the type essentially comprising two elements, namely a femoral element (2) and a cephalic element (3).

L'élément fémoral (2) comprend essentiellement une tige (4) destinée à être engagée et vissée dans le canal médullaire (5) du fémur (6\ considéré. Cette tige (4) porte extérieurement un filetage conique (4a) et son extrémité de grand diamètre, c'est-à-dire celle opposée à celle qui est destinée à être engagée dans le canal médullaire (5) du fémur (6), présente une collerette (7) coaxiale à l'axe (4b) de la tige (4). Au centre de la collerette (7), l'élément fémoral (2) porte un bossage tronconique (8) dont l'axe comcide avec celui de la tige d'ancrage (4). The femoral element (2) essentially comprises a rod (4) intended to be engaged and screwed into the medullary canal (5) of the femur (6 \ considered. This rod (4) externally carries a conical thread (4a) and its end of large diameter, that is to say that opposite to that which is intended to be engaged in the medullary canal (5) of the femur (6), has a flange (7) coaxial with the axis (4b) of the rod (4) At the center of the collar (7), the femoral element (2) carries a frustoconical boss (8), the axis of which coincides with that of the anchor rod (4).

Cet élément fémoral (2) est donc apte à être fixé dans le canal médullaire (5) du fémur (6) par vissage et, par conséquent, sans apport de ciment. This femoral element (2) is therefore able to be fixed in the medullary canal (5) of the femur (6) by screwing and, consequently, without adding cement.

Le second élément de cette partie fémorale de prothèse, à savoir l'élément céphalique (3), qui est destiné à remplacer le col (9) et la tête (11) préalablement réséqués du fémur (6), est destiné à être assemblé à l'élément fémoral (2).  The second element of this femoral part of the prosthesis, namely the cephalic element (3), which is intended to replace the neck (9) and the head (11) previously resected from the femur (6), is intended to be assembled to the femoral component (2).

Cet élément céphalique (3) présente, à l'une de ses extrémités, une tête sphérique (12) tronquée, éventuellement coiffée d'une cupule sphérique (13) destinée à prendre appui dans la cavité cotyloidienne du patient ou dans une cupule fixée au cotyle de ce patient. This cephalic element (3) has, at one of its ends, a truncated spherical head (12), possibly capped with a spherical cup (13) intended to rest in the acetabulum of the patient or in a cup fixed to the acetabulum of this patient.

A son autre extrémité, il présente une surface plane (14) destinée à prendre appui contre la face supérieure (7a) de la collerette (7) de l'élément fémoral (2). L'axe de révolution (12a) de la tête sphérique tronquée (12) fait, avec l'axe (4b) de la tige d'ancrage (4), un angle (15) correspondant à l'angle formé normalement entre l'axe du fémur (6) et l'axe de son col (9). At its other end, it has a flat surface (14) intended to bear against the upper face (7a) of the flange (7) of the femoral element (2). The axis of revolution (12a) of the truncated spherical head (12) makes, with the axis (4b) of the anchor rod (4), an angle (15) corresponding to the angle normally formed between the axis of the femur (6) and the axis of its neck (9).

Au centre de la surface d'appui (14) de l'élément céphalique (3), est ménagé un puits tronconique (16) de profil complémentaire de celui du bossage (8) de l'élément fémoral (2), puits (16) et bossage (8) qui sont destinés à être engagés l'un dans l'autre jusqu'à leur coincement réciproque lors de l'assemblage de l'élément céphalique (3) à l'élément fémoral (2). In the center of the bearing surface (14) of the cephalic element (3), is formed a frustoconical well (16) of profile complementary to that of the boss (8) of the femoral element (2), well (16 ) and boss (8) which are intended to be engaged one in the other until their mutual jamming during the assembly of the cephalic element (3) to the femoral element (2).

Pour améliorer la liaison en rotation entre l'élément fémoral (2) et l'élément céphalique (3) et éliminer ainsi tout risque de pivotement du second par rapport au premier, il est prévu, d'une part, sur la face supérieure (7a) de la collerette (7) de l'élément fémoral (2), une rangée circulaire de trous cylindriques (17) et, d'autre part, en saillie sur la face d'appui (14) de l'élément céphalique (3), au moins un ergot (18) ayant sensiblement la même dimension que le trou (17) et destiné à être engagé dans llun choisi de ces trous lors de l'assemblage de l'élément céphalique (3) à l'élément fémoral (2). To improve the rotational connection between the femoral element (2) and the cephalic element (3) and thus eliminate any risk of pivoting of the second relative to the first, it is provided, on the one hand, on the upper face ( 7a) of the collar (7) of the femoral element (2), a circular row of cylindrical holes (17) and, on the other hand, projecting from the bearing face (14) of the cephalic element ( 3), at least one lug (18) having substantially the same dimension as the hole (17) and intended to be engaged in a chosen one of these holes during the assembly of the cephalic element (3) to the femoral element (2).

Cette partie fémorale de prothèse se distingue donc essentiellement de celle décrite dans le brevet français précité 2 481 596 par le fait que, par rapport à cette dernière, le bossage tronconique (8) et le puits (16) destiné à le recevoir sont disposés de façon inverse, c'est-à-dire que le bossage (8) appartient à l'élément fémoral (2) et non à ltélément céphalique (3), tandis que le puits (16) appartient à l'élément céphalique (3) et non à l'élément fémoral (2). This femoral part of the prosthesis is therefore essentially distinguished from that described in the aforementioned French patent 2,481,596 by the fact that, relative to the latter, the frustoconical boss (8) and the well (16) intended to receive it are arranged conversely, that is to say that the boss (8) belongs to the femoral element (2) and not to the cephalic element (3), while the well (16) belongs to the cephalic element (3) and not to the femoral component (2).

Il résulte de cette inversion de disposition la possibilité très avantageuse de pouvoir parfaire l'assemblage de ces deux éléments (2) et (3) par vissage. A cet effet, le bossage (8) présente, coaxialement à son axe commun à l'axe (4b) de la tige (4), un trou taraudé (8a) et l'élément céphalique (3) présente, dans le fond de son puits (16) et coaxialement à ce dernier, un alésage traversant (19) servant, d'une part, au passage d'une vis d'assemblage (21) et, d'autre part, dans sa partie d'extrémité (19a), au logement et à la retenue de la tête (21a) de la vis (21). It results from this inversion of arrangement the very advantageous possibility of being able to perfect the assembly of these two elements (2) and (3) by screwing. To this end, the boss (8) has, coaxially with its axis common to the axis (4b) of the rod (4), a tapped hole (8a) and the cephalic element (3) present, in the bottom of its well (16) and coaxially with the latter, a through bore (19) serving, on the one hand, for the passage of an assembly screw (21) and, on the other hand, in its end part ( 19a), housing and retaining the head (21a) of the screw (21).

La vis (21) étant disposée coaxialement à la tige d'ancrage (4) de l'élément fémoral, sa position de la vis d'assemblage (21) n'est pas modifiée par le vissage de l'élément fémoral (2) dans le fémur (6) et, par conséquent, le caractère aléatoire de la position angulaire de cet élément fémoral (2) en fin de vissage n'est d'aucune conséquence à l'égard de la position de la vis (21). En outre, la position centrale de la vis (21) par rapport au bossage (8) de l'élément fémoral (2) permet d'affiner au maximum l'élément céphalique (3), notamment dans sa partie située au voisinage du grand trochanter (22), ce qui permet de conserver un volume maximum à ce dernier. The screw (21) being arranged coaxially with the anchor rod (4) of the femoral element, its position of the connecting screw (21) is not modified by the screwing of the femoral element (2) in the femur (6) and, consequently, the random nature of the angular position of this femoral element (2) at the end of screwing is of no consequence with regard to the position of the screw (21). In addition, the central position of the screw (21) relative to the boss (8) of the femoral element (2) makes it possible to refine the cephalic element (3) as much as possible, in particular in its part located in the vicinity of the large trochanter (22), which allows the latter to be kept at maximum volume.

On comprend aisément qu'avec la disposition inverse, il n'est pas possible de prévoir une vis d'assemblage coaxialement à la tige d'ancrage (4) de l'élément fémoral (2) et que, de cette impossibilité, découlent de grandes difficultés sinon une impossibilité, pour prévoir une liaison complémentaire par vissage. It is easily understood that with the reverse arrangement, it is not possible to provide a connecting screw coaxially to the anchor rod (4) of the femoral element (2) and that, from this impossibility, arise from great difficulties if not impossible, to provide a complementary connection by screwing.

Il faut noter que, comme cela était le cas dans la partie fémorale de prothèse décrite dans le brevet français précité, les trous (17) ménagés dans la face supérieure de la collerette (7) de l'élément fémoral sont utilisables pour son entraînement en rotation lors de son vissage dans le fémur (6). It should be noted that, as was the case in the femoral part of the prosthesis described in the aforementioned French patent, the holes (17) formed in the upper face of the collar (7) of the femoral element can be used for its training in rotation when screwed into the femur (6).

Il a été indiqué précédemment que le bossage (8) et le puits (16) étaient de forme tronconique ; il est évident que la présence de la vis d'assemblage (21) rend non nécessaire cette forme tronconique, de sorte que le bossage (8) et le puits (16) peuvent être aussi de forme cylindrique. It was previously indicated that the boss (8) and the well (16) were of frustoconical shape; it is obvious that the presence of the assembly screw (21) makes this frustoconical shape unnecessary, so that the boss (8) and the well (16) can also be of cylindrical shape.

Dans l'exemple illustré sur le dessin, il a été donné à la tête (21a) de la vis d'assemblage (21) et à la partie (19a) de l'alésage (19) lui servant de logement, une forme tronconique à faible pente de manière à assurer leur liaison, en fin de vissage, par coincement réciproque. Cette disposition présente l'avantage d'améliorer considérablement la tenue de l'assemblage.  In the example illustrated in the drawing, the head (21a) of the assembly screw (21) and the part (19a) of the bore (19) serving as its housing have been given a frustoconical shape. at a slight slope so as to ensure their connection, at the end of screwing, by reciprocal wedging. This arrangement has the advantage of considerably improving the behavior of the assembly.

Claims (4)

- REVENDICATX)NS -- REVENDICATX) NS - 1.- Partie fémorale de prothèse pour articulation de la hanche, du type comportant deux éléments (2,3) aptes à être fixés l'un à l'autre, à savoir, un élément fémoral (2) formé essentiellement d'une tige filetée (4) destinée à être engagée dans le canal médullaire (5) du fémur (6) considéré, et un élément céphalique (3) supportant une sphère (12,13), adaptable à l'extrémité de la partie fémorale (2) non engagée dans le fémur (6), cette sphère (12,13) étant destinée à être engagée et à prendre appui soit directement dans la cavité cotyloldienne de la hanche correspondante, soit dans une cupule préalablement fixée au cotyle, et dans lequel l'extrémité de l'élément fémoral (2) non engagée dans le canal médullaire (5) du fémur (6) porte une collerette (7) coaxiale à la tige (4), dont la face inférieure est destinée à prendre appui contre l'extrémité réséquée du fémur (6), dont la face supérieure (7a) est destinée à servir de face d'appui à l'élément céphalique (3) et qui est munie de moyens pour permettre son entraînement en rotation lors de son vissage, et dans lequel il est, en outre, prévu au moins un ergot (17) porté par la face d'appui (14) de l'élément céphalique (3) et une rangée circulaire de trous (18) de profil complémentaire de celui de l'ergot (17), ménagés le long du bord de la collerette (7) de l'élément fémoral (2) et dans l'un choisi desquels peut être engagé l'ergot (17) avant l'assemblage de l'élément céphalique (3) à l'élément fémoral (2), caractérisée en ce que la face d'appui (7a) de l'élément fémoral (2) porte, en son centre, c'est-à-dire coaxialement à sa collerette (7), un bossage (8) de centrage et de guidage de l'élément céphalique (3), au centre duquel est aménagé un trou taraudé (8a) et, au centre de la face d'appui (14) de l'élément céphalique (3), est ménagé un puits (16) de profil complémentaire de celui du bossage (8) de l'élément fémoral (2) et sur lequel il est destiné à être engagé, le fond de ce puits (16) étant prolongé par un alésage coaxial (19) prévu pour le passage de la tige filetée d'une vis d'assemblage (21) et le logement et la retenue de la tête (21a) de cette vis (21). 1.- Femoral part of prosthesis for hip joint, of the type comprising two elements (2,3) capable of being fixed to one another, namely, a femoral element (2) essentially formed by a rod threaded (4) intended to be engaged in the medullary canal (5) of the femur (6) considered, and a cephalic element (3) supporting a sphere (12,13), adaptable to the end of the femoral part (2) not engaged in the femur (6), this sphere (12,13) being intended to be engaged and to rest either directly in the acetabulum of the corresponding hip, or in a cup previously fixed to the acetabulum, and in which the end of the femoral element (2) not engaged in the medullary canal (5) of the femur (6) carries a flange (7) coaxial with the rod (4), the underside of which is intended to bear against the end resected of the femur (6), the upper face (7a) of which is intended to serve as a bearing face for the cephalic element (3) and which is provided with means s to allow it to rotate during its screwing, and in which there is, in addition, at least one lug (17) carried by the bearing face (14) of the cephalic element (3) and a row circular holes (18) of profile complementary to that of the lug (17), formed along the edge of the flange (7) of the femoral element (2) and in one chosen from which can be engaged the lug (17) before assembly of the cephalic element (3) to the femoral element (2), characterized in that the bearing face (7a) of the femoral element (2) carries, in its center , that is to say coaxially with its collar (7), a boss (8) for centering and guiding the cephalic element (3), in the center of which is provided a tapped hole (8a) and, in the center from the bearing face (14) of the cephalic element (3), is provided a well (16) of profile complementary to that of the boss (8) of the femoral element (2) and on which it is intended to be engaged, the bottom of this well (16) being extended by a bore e coaxial (19) provided for the passage of the threaded rod of a connecting screw (21) and the housing and the retention of the head (21a) of this screw (21). 2.- Partie fémorale de prothèse selon la revendication 1, caractérisée en ce que le bossage (8) prévu pour le centrage et le guidage de l'élément céphalique (3) ainsi que le puits (16) ménagé dans ce dernier pour le recevoir, sont cylindriques. 2.- femoral prosthesis part according to claim 1, characterized in that the boss (8) provided for centering and guiding the cephalic element (3) as well as the well (16) formed in the latter to receive it , are cylindrical. 3.- Partie fémorale de prothèse selon la revendication 1, caractérisée en ce que le bossage (8) prévu sur l'élément fémoral (2) pour le  3.- femoral part of prosthesis according to claim 1, characterized in that the boss (8) provided on the femoral element (2) for the centrage et le guidage de l'élément céphalique (3), ainsi que le puits centering and guiding of the cephalic element (3), as well as the well (16) ménagé dans ce dernier pour le recevoir, sont tronconiques. (16) formed in the latter to receive it, are tapered. 4.- Partie fémorale de prothèse selon l'une quelconque des 4.- Femoral part of prosthesis according to any one of revendications précédentes, caractérisée en ce que la partie (19a) de l'alé previous claims, characterized in that the part (19a) of the bore sage (19) ménagé coaxialement au puits (16) de l'élément céphalique (3) pour loger et retenir la tête (21a) de la vis (21), ainsi que la tête (21a) de cette dernière, sont tronconiques à faible pente pour permettre leur liaison par coincement réciproque en fin de vissage.  sage (19) formed coaxially with the well (16) of the cephalic element (3) to accommodate and retain the head (21a) of the screw (21), as well as the head (21a) of the latter, are frustoconical at low slope to allow their connection by reciprocal wedging at the end of screwing.
FR8505651A 1985-04-10 1985-04-10 FEMALE PROSTHESIS FOR HIP JOINT Expired FR2580171B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR8505651A FR2580171B1 (en) 1985-04-10 1985-04-10 FEMALE PROSTHESIS FOR HIP JOINT
CA000506173A CA1283251C (en) 1985-04-10 1986-04-09 Femoral section for hip joint prosthesis
BR8601592A BR8601592A (en) 1985-04-10 1986-04-09 FEMURAL PART OF PROSTHESIS FOR HIP ARTICULATION

Applications Claiming Priority (1)

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FR8505651A FR2580171B1 (en) 1985-04-10 1985-04-10 FEMALE PROSTHESIS FOR HIP JOINT

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FR2580171A1 true FR2580171A1 (en) 1986-10-17
FR2580171B1 FR2580171B1 (en) 1989-12-01

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606273A1 (en) * 1986-11-10 1988-05-13 Collomb Jean Improved joint prosthesis
FR2616060A1 (en) * 1987-06-03 1988-12-09 Tornier Sa Hip prosthesis with variable epiphyseal part
FR2619305A1 (en) * 1987-08-13 1989-02-17 Collomb Jean Total hip prosthesis with primary fixation
US4871369A (en) * 1987-11-23 1989-10-03 Pfizer Hospital Products Group, Inc. Long stem hip implant
FR2640497A1 (en) * 1988-12-19 1990-06-22 Mesguich Alain Femoral implant for a hip prosthesis
US4950300A (en) * 1987-08-03 1990-08-21 Omci Sa Hip prosthesis with interchangeable epiphysus
DE4320086A1 (en) * 1993-06-17 1994-12-22 Peter Brehm Modular shaft for a revision hip prosthesis system
US5645600A (en) * 1994-09-12 1997-07-08 Bimman; Lev A. High performance stem for arthroplasty
US5653765A (en) * 1994-07-01 1997-08-05 Ortho Development Corporation Modular prosthesis
US5702480A (en) * 1992-10-13 1997-12-30 Kropf; Philipp Rolf Modular hip joint prosthesis
US5931871A (en) * 1993-10-21 1999-08-03 Allo Pro Ag Kit of parts for a modular femur head prosthesis, in particular, a reoperation prosthesis, and a femur head prosthesis from such a kit of parts
EP1013245A3 (en) * 1998-12-18 2001-11-21 Benoist Girard Sas Femoral component

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH541963A (en) * 1971-09-07 1973-09-30 Sulzer Ag Endo-elbow joint prosthesis
FR2239979A1 (en) * 1973-08-10 1975-03-07 Pfaudler Werke Ag
DE2621666A1 (en) * 1976-05-15 1977-11-24 Hans Dr Reimer Endoprosthesis for hip, knee or angled joint - consists of joint part with shaft anchored in natural or bored bone channel to spread weight over large area
DE2839093A1 (en) * 1978-09-08 1980-03-20 Hans Dr Reimer Hip or knee endoprosthesis - with serrated oblique face on ball joint anchored by threaded shank
FR2481596A1 (en) * 1980-04-30 1981-11-06 Rambert Andre INSTRAMEDULAR PROSTHESIS NOT SEALED FOR HIP JOINTS
DE3138848A1 (en) * 1981-09-30 1983-04-21 GMT GESELLSCHAFT FüR MEDIZINISCHE TECHNIK MBH ENDOPROTHESIS TO REPLACE ROD-SHAPED BONES

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH541963A (en) * 1971-09-07 1973-09-30 Sulzer Ag Endo-elbow joint prosthesis
FR2239979A1 (en) * 1973-08-10 1975-03-07 Pfaudler Werke Ag
DE2621666A1 (en) * 1976-05-15 1977-11-24 Hans Dr Reimer Endoprosthesis for hip, knee or angled joint - consists of joint part with shaft anchored in natural or bored bone channel to spread weight over large area
DE2839093A1 (en) * 1978-09-08 1980-03-20 Hans Dr Reimer Hip or knee endoprosthesis - with serrated oblique face on ball joint anchored by threaded shank
FR2481596A1 (en) * 1980-04-30 1981-11-06 Rambert Andre INSTRAMEDULAR PROSTHESIS NOT SEALED FOR HIP JOINTS
DE3138848A1 (en) * 1981-09-30 1983-04-21 GMT GESELLSCHAFT FüR MEDIZINISCHE TECHNIK MBH ENDOPROTHESIS TO REPLACE ROD-SHAPED BONES

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606273A1 (en) * 1986-11-10 1988-05-13 Collomb Jean Improved joint prosthesis
FR2616060A1 (en) * 1987-06-03 1988-12-09 Tornier Sa Hip prosthesis with variable epiphyseal part
US4950300A (en) * 1987-08-03 1990-08-21 Omci Sa Hip prosthesis with interchangeable epiphysus
FR2619305A1 (en) * 1987-08-13 1989-02-17 Collomb Jean Total hip prosthesis with primary fixation
US4871369A (en) * 1987-11-23 1989-10-03 Pfizer Hospital Products Group, Inc. Long stem hip implant
FR2640497A1 (en) * 1988-12-19 1990-06-22 Mesguich Alain Femoral implant for a hip prosthesis
US5702480A (en) * 1992-10-13 1997-12-30 Kropf; Philipp Rolf Modular hip joint prosthesis
DE4320086A1 (en) * 1993-06-17 1994-12-22 Peter Brehm Modular shaft for a revision hip prosthesis system
DE4320086C3 (en) * 1993-06-17 2002-05-16 Peter Brehm Modular shaft for a revision hip prosthesis system
US5931871A (en) * 1993-10-21 1999-08-03 Allo Pro Ag Kit of parts for a modular femur head prosthesis, in particular, a reoperation prosthesis, and a femur head prosthesis from such a kit of parts
US5653765A (en) * 1994-07-01 1997-08-05 Ortho Development Corporation Modular prosthesis
US5645600A (en) * 1994-09-12 1997-07-08 Bimman; Lev A. High performance stem for arthroplasty
EP1013245A3 (en) * 1998-12-18 2001-11-21 Benoist Girard Sas Femoral component

Also Published As

Publication number Publication date
FR2580171B1 (en) 1989-12-01
BR8601592A (en) 1986-12-09
CA1283251C (en) 1991-04-23

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