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FR2693367A1 - Femoral rod penetrating whole length of bone - has series of recesses both perpendicular and parallel to longitudinal axis preventing movement within bone - Google Patents

Femoral rod penetrating whole length of bone - has series of recesses both perpendicular and parallel to longitudinal axis preventing movement within bone Download PDF

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Publication number
FR2693367A1
FR2693367A1 FR9208759A FR9208759A FR2693367A1 FR 2693367 A1 FR2693367 A1 FR 2693367A1 FR 9208759 A FR9208759 A FR 9208759A FR 9208759 A FR9208759 A FR 9208759A FR 2693367 A1 FR2693367 A1 FR 2693367A1
Authority
FR
France
Prior art keywords
rod
bone
series
recesses
femoral stem
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR9208759A
Other languages
French (fr)
Other versions
FR2693367B3 (en
Inventor
Rousseau Patrick
Pfaifer Patrick
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.)
Groupe Lepine SAS
Original Assignee
Groupe Lepine SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Groupe Lepine SAS filed Critical Groupe Lepine SAS
Priority to FR9208759A priority Critical patent/FR2693367B3/en
Publication of FR2693367A1 publication Critical patent/FR2693367A1/en
Application granted granted Critical
Publication of FR2693367B3 publication Critical patent/FR2693367B3/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
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    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • 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
    • A61F2002/30813—Stepped or enlarged blind bores, e.g. having discrete diameter changes
    • 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
    • A61F2002/30845—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes with cutting edges
    • 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
    • A61F2002/365—Connections of heads to 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
    • A61F2002/3652—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
    • 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
    • A61F2002/3678—Geometrical features
    • A61F2002/369—Stepped shaft, i.e. having discrete diameter changes
    • 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
    • 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
    • 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
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Landscapes

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

Abstract

Femoral rod for hip joint prosthesis comprises (a) end section (2b), without a collar, in contact with orifice in bone; (b) transversal section defining four longitudinal ridges, two of which (4) are either side of the principal faces (2c) of the rod (2) and parallel to the longitudinal axis; and (c) a series of recesses (5,6,7) in the end section of the rod (2b). The primary series (5) in the upper part are perpendicular to the longitudinal axis and comprise longitudinal terraces descending in the direction of the distal end (2a) of the rod. The secondary recesses (6) are situated along the ridges (4) in the direction of the narrow lateral face (2d) on the side of the spherical head (n/s). The third series (7) are within the terraces (6) and have descending terraces in the direction of the distal end (2a) of the rod. USE/ADVANTAGE - Artificial hip joints. Rod penetrates to distal end of bone. Movement of rod within bone prevented.

Description

TIGE PEXORALE POUR PROTHESE DE HANCHE
La présente invention concerne une tige fémorale pour prothèse de hanche.PEXORAL ROD FOR HIP PROSTHESIS
The present invention relates to a femoral stem for hip prosthesis.

Les tiges fémorales existantes possèdent une extrémité effilée destinée à être engagée dans le canal médullaire de l'os et une collerette, située à la base du col portant la tête sphérique, destinée à venir en appui sur la face d'extrémité réséquée de l'os. The existing femoral stems have a tapered end intended to be engaged in the medullary canal of the bone and a collar, located at the base of the neck carrying the spherical head, intended to come to bear on the resected end face of the bone.

La partie métaphysaire de la tige comprend soit des organes d'accrochage tels que des rainures, des nervures ou des picots saillants, soit un matériau plus ou moins poreux favorisant la repousse osseuse, selon que la tige est destinée à être implantée avec ou sans ciment. The metaphyseal part of the rod comprises either hooking members such as grooves, ribs or protruding pins, or a more or less porous material promoting bone regrowth, depending on whether the rod is intended to be implanted with or without cement .

Ces tiges sont introduites dans le canal médullaire de l'os, préalablement préparé à cet effet, jusqu'à venue de la collerette en appui contre l'extrémité réséquée de l'os. These rods are introduced into the medullary canal of the bone, previously prepared for this purpose, until the collar comes into abutment against the resected end of the bone.

Elles présentent l'inconvénient de n'être solidarisées à l'os qu'au niveau de leur partie métaphysaire et de n'être qu'imparfaitement maintenues dans l'os sur leur longueur et au niveau de leur extrémité distale, la paroi de l'os délimitant le canal médullaire ayant dû être fraisée à un diamètre supérieur à celui de ladite extrémité effilée pour permettre son engagement jusqu'à la venue de la collerette au contact de la paroi de l'os délimitant l'ouverture du canal. Ce fraisage est d'autant plus important que la partie diaphysaire de l'os est bien souvent plus ou moins courbe, ce qui conduit, en outre, à entamer la paroi de l'os et à la fragiliser à cet endroit. They have the disadvantage of being joined to the bone only at their metaphyseal part and of being only imperfectly maintained in the bone over their length and at their distal end, the wall of the 'bone defining the medullary canal having to be milled to a diameter greater than that of said tapered end to allow its engagement until the flange comes into contact with the wall of the bone defining the opening of the canal. This milling is all the more important as the diaphyseal part of the bone is very often more or less curved, which leads, moreover, to enter the wall of the bone and to weaken it there.

Il en résulte une possibilité de micro-mouvements de la tige par rapport à l'os sous l'effet des contraintes verticales et en rotation qu'elle subit lors de la marche, ces micro-mouvements étant douloureux pour le patient et surtout préjudiciables à une bonne tenue dans le temps du ciment ainsi qu'à la repousse osseuse.  This results in a possibility of micro-movements of the rod relative to the bone under the effect of the vertical and rotational stresses which it undergoes during walking, these micro-movements being painful for the patient and above all harmful to good resistance over time of the cement as well as bone regrowth.

La présente invention vise à remédier à ces inconvénients. The present invention aims to remedy these drawbacks.

A cette fin, la tige fémorale qu'elle concerne comprend, en combinaison
- une partie mêtaphysaire, qui est dépourvue de collerette destinée à venir en appui contre l'extrémité réséquée de l'os
- une section transversale de forme polygonale, délimitant au moins deux arêtes vives longitudinales, dont deux sont situées sur chacune des deux faces principales de la tige parallèlement à l'axe longitudinal de celle-ci, et
- trois séries de décrochements successifs ménagés dans la partie métaphysaire de la tige, les décrochements d'une première série, situés en partie supérieure, étant disposés perpendiculairement à l'axe longitudinal de la tige et constituant des gradins descendant en direction de la partie distale de la tige, les décrochements d'une deuxième série étant situés le long des deux arêtes précitées et constituant des gradins descendant en direction de la face étroite latérale de la tige située du côté de la tête sphérique et les décrochements de la troisième série étant ménagés dans les gradins successifs délimités par les décrochements de la deuxième série et constituant des gradins descendant en direction de l'extrémité distale de la tige.To this end, the femoral stem which it concerns comprises, in combination
- a metaphyseal part, which is devoid of a collar intended to bear against the resected end of the bone
a cross section of polygonal shape delimiting at least two longitudinal sharp edges, two of which are located on each of the two main faces of the rod parallel to the longitudinal axis thereof, and
- three series of successive recesses formed in the metaphyseal part of the rod, the recesses of a first series, located in the upper part, being arranged perpendicular to the longitudinal axis of the rod and constituting steps descending towards the distal part of the rod, the recesses of a second series being located along the two aforementioned edges and constituting steps descending in the direction of the narrow lateral face of the rod situated on the side of the spherical head and the recesses of the third series being provided in the successive steps delimited by the recesses of the second series and constituting steps descending towards the distal end of the rod.

L'absence de collerette permet l'enfoncement de la tige jusqu'au coincement de son extrémité distale dans le canal diaphysaire, ce qui assure l'immobilisation de la tige en partie distale et interdit tout micro-mouvement de celle-ci préjudiciables à son ancrage. The absence of a flange allows the rod to be pushed in until its distal end is wedged in the diaphyseal canal, which immobilizes the rod in the distal part and prevents any micro-movement of the latter which is detrimental to its anchoring.

Au cours de cet enfoncement, lesdits gradins viennent progressivement soit mouler le ciment préalablement engagé dans la cavité, lorsque la tige est destinée à être ancrée à l'aide d'un tel ciment, soit s'enfoncer étroitement dans l'os spongieux en y formant leur empreinte, dans le cas où la tige est destinée à être ancrée par repousse osseuse. During this depression, said steps gradually come either to mold the cement previously engaged in the cavity, when the rod is intended to be anchored using such a cement, or to sink tightly into the cancellous bone therein. forming their imprint, in the case where the rod is intended to be anchored by bone regrowth.

Une fois le durcissement du ciment ou la repousse osseuse opéré, les gradins et les arêtes vives précitées s'opposent parfaitement aux contraintes verticales et en rotation que peut subir la tige, ce qui interdit tout micro-mouvement de celle-ci. Once the cement or bone regrowth has hardened, the steps and the sharp edges mentioned above are perfectly opposed to the vertical and rotational stresses that the rod can undergo, which prevents any micro-movement of the latter.

Une totale immobilisation de la tige par rapport à l'os est ainsi obtenue. A total immobilization of the rod relative to the bone is thus obtained.

Avantageusement, la partie distale de la tige est fendue sur sensiblement un tiers de la hauteur de la tige, dans le plan antéro-postérieur, la fente délimitant deux branches aptes à être élastiquement rapprochées l'une de l'autre. Advantageously, the distal part of the rod is split over substantially a third of the height of the rod, in the anteroposterior plane, the slot delimiting two branches capable of being elastically brought closer to one another.

Après être venues en appui contre la paroi de l'os, les deux branches sont déplacées l'une en direction de l'autre lorsque le mouvement d'enfoncement de la tige se poursuit. La souplesse ainsi obtenue permet l'enfoncement de la tige jusqu'au parfait ancrage de sa partie métaphysaire et assure l'adaptabilité de sa partie distale à la forme de l'os. After coming to bear against the wall of the bone, the two branches are moved one towards the other when the pushing movement of the rod continues. The flexibility thus obtained allows the rod to be pushed down to the perfect anchoring of its metaphyseal part and ensures the adaptability of its distal part to the shape of the bone.

En outre, la tige selon l'invention comprend un col interchangeable et assemblable à elle par un emmanchement conique de faible pente, une série de cols différents pouvant être montés sur la tige selon les besoins, à savoir des cols droits ou non, de longueurs différentes. In addition, the rod according to the invention comprises an interchangeable neck which can be assembled to it by a conical fitting with a slight slope, a series of different necks which can be mounted on the rod as required, namely straight or non-necks, of lengths different.

Dans le cas où le col n'est pas droit, c'est-à-dire lorsque l'axe de sa partie sur laquelle la tête sphérique de la prothèse peut être mise en place forme un angle avec l'axe de sa partie pouvant être engagée dans un trou correspondant ménagé dans la tige elle-même, avantageusement, le col comporte une collerette, située à la base de sa partie destinée à être engagée dans ce trou, qui comprend une pluralité de saillies radiales disposées longitudinalement et régulièrement réparties sur sa périphérie, aptes à coopérer avec un alésage ménagé dans la tige dont la paroi a un profil complémentaire. Il est ainsi possible d'orienter angulairement le col et de le fixer dans la position désirée, ce qui permet, selon la position retenue par rapport à l'axe de la tige, d'obtenir soit un col latéralisé, soit un col antéversé, soit un col latéralisé antéversé.Selon une forme de réalisation avantageuse au plan de la fabrication, cette collerette a une section transversale en forme générale d'hexagone, dont les angles, formant les saillies précitées, ont un profil arrondi inscrit dans un cercle de même centre que l'hexagone. In the case where the neck is not straight, that is to say when the axis of its part on which the spherical head of the prosthesis can be placed forms an angle with the axis of its part which can be engaged in a corresponding hole formed in the rod itself, advantageously, the neck comprises a collar, located at the base of its part intended to be engaged in this hole, which comprises a plurality of radial projections arranged longitudinally and regularly distributed over its periphery, able to cooperate with a bore formed in the rod whose wall has a complementary profile. It is thus possible to orient the neck angularly and fix it in the desired position, which makes it possible, depending on the position chosen with respect to the axis of the rod, to obtain either a lateralized neck or an anversed neck, or an anversed lateralized neck. According to an advantageous embodiment from the manufacturing point of view, this flange has a cross section in the general shape of a hexagon, the angles of which, forming the aforementioned projections, have a rounded profile inscribed in a circle of the same center than the hexagon.

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

La figure 1 en est une vue éclatée, de côté
la figure 2 en est une vue en coupe selon Il-Il de figure 1
la figure 3 en est une vue à échelle agrandie, selon III-III de figure 1 et
les figures 4 et 5 en sont des vues selon une variante.Figure 1 is an exploded side view
Figure 2 is a sectional view along Il-Il of Figure 1
FIG. 3 is a view on an enlarged scale, along III-III of FIG. 1 and
Figures 4 and 5 are views according to a variant.

La figure 1 représente une tige fémorale 2 pour prothèse de hanche comprenant une extrémité 2a, dite "distale", destinée à être engagée dans le canal médullaire de l'os et un collet 3, destiné à porter, grâce à une extrémité 3a en forme de cône à faible pente, une tête sphérique (non représentée), venant s'engager et pivoter dans une cavité ménagée dans la cupule d'une prothèse cotyloïdienne, prévue pour la recevoir. FIG. 1 represents a femoral stem 2 for hip prosthesis comprising an end 2a, called "distal", intended to be engaged in the medullary canal of the bone and a collar 3, intended to carry, thanks to a shaped end 3a cone with a slight slope, a spherical head (not shown), coming to engage and pivot in a cavity formed in the cup of an acetabular prosthesis, intended to receive it.

La tige fémorale 2 comprend
- une partie métaphysaire 2b, qui est dépourvue de collerette destinée à venir en appui contre l'extrémité réséquée de l'os
- une section transversale de forme polygonale, ainsi que le montre la figure 2, délimitant quatre arêtes vives longitudinales, dont deux, désignées par la référence 4, sont situées chacune sur les deux faces principales 2c de la tige 2 parallèlement à l'axe longitudinal de celle-ci, et
- trois séries 5,6,7 de décrochements successifs ménagés dans la partie métaphysaire 2b des faces principales 2c de la tige 2.The femoral stem 2 includes
- a metaphyseal part 2b, which is devoid of a collar intended to bear against the resected end of the bone
- A cross section of polygonal shape, as shown in Figure 2, delimiting four longitudinal sharp edges, two of which, designated by the reference 4, are each located on the two main faces 2c of the rod 2 parallel to the longitudinal axis of it, and
- three series 5,6,7 of successive setbacks formed in the metaphyseal part 2b of the main faces 2c of the rod 2.

Ainsi que le montre plus particulièrement la figure 3, les décrochements de la série 5, situés en partie supérieure de la tige 2, sont disposés perpendiculairement à l'axe longitudinal de la tige 2 et constituent des gradins Sa descendant en direction de la partie distale 2a. As shown more particularly in FIG. 3, the recesses of the series 5, located in the upper part of the rod 2, are arranged perpendicular to the longitudinal axis of the rod 2 and constitute steps Sa descending towards the distal part 2a.

Les décrochements de la série 6 sont situés le long des deux arêtes 4 et constituent des gradins 6a descendant en direction de la face étroite latérale 2d de la tige 2 située du côté où se trouve la tête sphérique. The recesses of the series 6 are located along the two edges 4 and constitute steps 6a descending in the direction of the narrow lateral face 2d of the rod 2 situated on the side where the spherical head is located.

Les décrochements de la série 7 sont ménagés dans les gradins successifs 6a délimités par les décrochements de la série 6 et constituent des gradins 7a descendant en direction de l'extrémité distale 2a. Les gradins 7a sont au nombre de quatre sur le gradin 6a qui est le plus proche de l'arête 4, puis, successivement, au nombre de trois, deux et un sur les autres gradins 6a s'étendant en direction de la face 2d, et sont décalés les uns par rapport aux autres. The recesses of the series 7 are formed in the successive steps 6a delimited by the recesses of the series 6 and constitute steps 7a descending in the direction of the distal end 2a. The steps 7a are four in number on the step 6a which is closest to the edge 4, then, successively, three, two and one on the other steps 6a extending in the direction of the face 2d, and are offset from each other.

L'absence de collerette permet l'enfoncement de la tige 2 jusqu'au coincement de son extrémité distale 2a dans le canal médullaire de l'os, ce qui assure l'immobilisation de la tige 2 en partie distale et interdit tout micro-mouvement de celle-ci préjudiciable à son ancrage. The absence of a flange allows the rod 2 to be pushed in until its distal end 2a is jammed in the medullary canal of the bone, which immobilizes the rod 2 in the distal part and prevents any micro-movement. of this prejudicial to its anchoring.

Au cours de cet enfoncement, les gradins 7a,6a et
Sa viennent progressivement soit mouler le ciment préalablement engagé dans la cavité, lorsque la tige 2 est destinée à être ancrée à l'aide d'un tel ciment, soit s'enfoncer étroitement dans l'os spongieux en y formant leur empreinte, dans le cas où la tige 2 est destinée à être ancree par repousse osseuse.During this depression, the steps 7a, 6a and
Its gradually come either to mold the cement previously engaged in the cavity, when the rod 2 is intended to be anchored using such a cement, or to sink tightly into the cancellous bone by forming their imprint there, in the case where the rod 2 is intended to be anchored by bone regrowth.

Une fois le durcissement du ciment ou la repousse osseuse opéré, les gradins 5a,6a,7a et les arêtes vives 4 s'opposent parfaitement aux contraintes verticales et en rotation que peut subir la tige 2, ce qui interdit tout micro-mouvement de celle-ci. Une totale immobilisation de la tige 2 par rapport à l'os est ainsi obtenue. Once the cement or bone regrowth has hardened, the steps 5a, 6a, 7a and the sharp edges 4 are perfectly opposed to the vertical and rotational stresses that the rod 2 can undergo, which prohibits any micro-movement of that -this. A total immobilization of the rod 2 relative to the bone is thus obtained.

La tige 2, lorsqu'elle est destinée à être ancrée par repousse osseuse, est recouverte en partie métaphysaire 2b, d'un matériau biocompatible poreux favorisant la repousse osseuse, tel que de l'hydroxyapatite de calcium. The rod 2, when it is intended to be anchored by bone regrowth, is partially covered metaphyseal 2b, with a porous biocompatible material promoting bone regrowth, such as calcium hydroxyapatite.

En outre, la partie distale 2a de la tige 2 peut être fendue sensiblement sur un tiers de la hauteur de la tige 2, dans le plan antéro-postérieur, la fente 8, représentée en traits mixtes sur la figure 1, délimitant deux branches 9 aptes à être élastiquement rapprochées l'une de l'autre. In addition, the distal part 2a of the rod 2 can be split substantially over a third of the height of the rod 2, in the anteroposterior plane, the slot 8, shown in phantom in Figure 1, delimiting two branches 9 able to be resiliently close to each other.

Après être venues en appui contre la paroi de l'os, les deux branches 9 sont déplacées l'une en direction de l'autre lorsque le mouvement d'enfoncement de la tige 2 se produit. La souplesse ainsi obtenue permet l'enfoncement de la tige 2 jusqu'au parfait ancrage de sa partie métaphysaire 2b et assure l'adaptabilité de sa partie distale 2a à la forme de l'os. After coming to bear against the wall of the bone, the two branches 9 are moved one towards the other when the sinking movement of the rod 2 occurs. The flexibility thus obtained allows the rod 2 to be pushed in until perfect anchoring of its metaphyseal part 2b and ensures the adaptability of its distal part 2a to the shape of the bone.

Par ailleurs, ainsi que le montre la figure 1, le col 3 est interchangeable et assemblable à la tige 2 par un emmanchement conique 3b de faible pente, une série de cols différents pouvant être montés sur la tige 2 selon les besoins, à savoir des cols droits tels que représentés sur la figure 1, ou des cols non droits (figure 4), de longueurs différentes. Un doigt de centrage 10 prolonge axialement la partie 3b et facilite la mise en place du col 3 dans l'évidement ménagé à cet effet dans la partie métaphysaire 2b de la tige 2. Furthermore, as shown in FIG. 1, the neck 3 is interchangeable and can be assembled with the stem 2 by a conical fitting 3b of slight slope, a series of different necks being able to be mounted on the stem 2 as required, namely straight collars as shown in Figure 1, or non-straight collars (Figure 4), of different lengths. A centering finger 10 axially extends part 3b and facilitates the positioning of the neck 3 in the recess provided for this purpose in the metaphyseal part 2b of the rod 2.

Dans le cas où le col n'est pas droit (figure 4), c'est-à-dire lorsque l'axe de sa partie 3a forme un angle avec celui de sa partie 3b, le col 3 comporte une collerette 15, située à la base de sa partie 3b, qui comprend une pluralité de saillies radiales 16, disposées longitudinalement et régulièrement réparties sur sa périphérie. La collerette 15 a une section transversale en forme générale d'hexagone, dont les angles ont un profil arrondi inscrit dans un cercle de même centre que l'hexagone. In the case where the neck is not straight (FIG. 4), that is to say when the axis of its part 3a forms an angle with that of its part 3b, the neck 3 has a flange 15, located at the base of its part 3b, which comprises a plurality of radial projections 16, arranged longitudinally and regularly distributed over its periphery. The flange 15 has a cross section in the general shape of a hexagon, the angles of which have a rounded profile inscribed in a circle with the same center as the hexagon.

La collerette 15 et les saillies 16 sont aptes à coopérer avec un alésage 17 ménagé dans la tige 2, comprenant des évidements radiaux 18 de profil complémentaire à elles. Il est ainsi possible d'orienter angulairement le col 3 et de le fixer dans une position déterminée par rapport à l'axe de la tige 2, afin d'obtenir, selon la position retenue, soit un col latéralisé, soit un col antéversé, soit un col latéralisé antéversé.  The flange 15 and the projections 16 are able to cooperate with a bore 17 formed in the rod 2, comprising radial recesses 18 of profile complementary to them. It is thus possible to orient the neck 3 angularly and fix it in a determined position relative to the axis of the rod 2, in order to obtain, depending on the position chosen, either a lateralized neck or an anversed neck, either an anversed lateral collar.

Claims (6)

REVENDICATIONS 1 - Tige fémorale pour prothèse de hanche, caractérisée en ce qu'elle comprend, en combinaison 1 - Femoral stem for hip prosthesis, characterized in that it comprises, in combination - une partie métaphysaire (2b), qui est dépourvue de collerette destinée à venir en appui contre l'extrémité réséquée de l'os ; - a metaphyseal part (2b), which is devoid of a collar intended to bear against the resected end of the bone; - une section transversale de forme polygonale, délimitant au moins deux arêtes vives longitudinales, dont deux (4) sont situées sur chacune des deux faces principales (2c) de la tige (2) parallèlement à l'axe longitudinal de celle-ci, et - a cross section of polygonal shape, delimiting at least two longitudinal sharp edges, two of which (4) are located on each of the two main faces (2c) of the rod (2) parallel to the longitudinal axis thereof, and - trois séries (5,6,7) de décrochements successifs ménagés dans la partie métaphysaire de la tige (2), les décrochements d'une première série (5), situés en partie supérieure, étant disposés perpendiculairement à l'axe longitudinal de la tige (2) et constituant des gradins (5a) descendant en direction de la partie distale de la tige (2), les décrochements d'une deuxième série (6) étant situés le long des deux arêtes (4) précitées et constituant des gradins (6a) descendant en direction de la face étroite latérale (2d) de la tige (2) située du côté de la tête sphérique et les décrochements de la troisième série (7) étant aménagés dans les gradins (6a) successifs délimités par les décrochements de la deuxième série (6) et constituant des gradins (7a) descendant en direction de l'extrémité distale (2a) de la tige (2). - Three series (5,6,7) of successive recesses formed in the metaphyseal part of the rod (2), the recesses of a first series (5), located in the upper part, being arranged perpendicular to the longitudinal axis of the rod (2) and constituting steps (5a) descending towards the distal part of the rod (2), the recesses of a second series (6) being located along the two edges (4) above and constituting steps (6a) descending towards the narrow lateral face (2d) of the rod (2) located on the side of the spherical head and the recesses of the third series (7) being arranged in the successive steps (6a) delimited by the notches of the second series (6) and constituting steps (7a) descending towards the distal end (2a) of the rod (2). 2 - Tige fémorale selon la revendication 1, caractérisée en ce que sa partie distale (2a) est fendue sur sensiblement le tiers de la hauteur de la tige (2), dans le plan antéro-postérieur, la fente (8) délimitant deux branches (9) aptes à être élastiquement rapprochées l'une de l'autre. 2 - Femoral stem according to claim 1, characterized in that its distal part (2a) is split over substantially one third of the height of the stem (2), in the anteroposterior plane, the slot (8) delimiting two branches (9) able to be resiliently brought together. 3 - Tige fémorale selon l'une des revendications 1 ou 2, caractérisée en ce qu'elle comprend un col (3) interchangeable et assemblable par un emmanchement conique (3b) de faible pente, une série de cols différents pouvant être montés sur elle selon les besoins, à savoir des cols droits ou non, de différentes longueurs. 3 - Femoral stem according to one of claims 1 or 2, characterized in that it comprises a neck (3) interchangeable and assembled by a conical fitting (3b) of slight slope, a series of different necks can be mounted on it according to the needs, namely straight or not collars, of different lengths. 4 - Tige fémorale selon la revendication 3, caractérisée en ce que, dans le cas où le col (3) n'est pas droit, c'est-à-dire lorsque l'axe de sa partie (3a) sur laquelle la tête sphérique de la prothèse peut être mise en place forme un angle avec l'axe de sa partie (3b) pouvant être engagée dans le trou correspondant ménagé dans la tige (2) elle-même, le col (3) comporte une collerette (15), située à la base de sa partie (3b) destinée à être engagee dans ce trou, qui comprend une pluralité de saillies radiales (16) disposées longitudinalement et régulièrement réparties sur sa périphérie, aptes à coopérer avec un alésage (17) ménagé dans la tige (2) dont la paroi a un profil complémentaire. 4 - Femoral stem according to claim 3, characterized in that, in the case where the neck (3) is not straight, that is to say when the axis of its part (3a) on which the head spherical of the prosthesis can be put in place at an angle with the axis of its part (3b) which can be engaged in the corresponding hole made in the rod (2) itself, the neck (3) has a flange (15 ), located at the base of its part (3b) intended to be engaged in this hole, which comprises a plurality of radial projections (16) arranged longitudinally and regularly distributed over its periphery, capable of cooperating with a bore (17) formed in the rod (2) whose wall has a complementary profile. 5 - Tige fémorale selon la revendication 4, caractérisée en ce que la collerette (15) a une section transversale en forme générale d'hexagone, dont les angles, formant les saillies (16) précitées, ont un profil arrondi inscrit dans un cercle de même centre que l'hexagone. 5 - Femoral stem according to claim 4, characterized in that the flange (15) has a cross section in the general shape of a hexagon, the angles of which, forming the projections (16) above, have a rounded profile inscribed in a circle of same center as the hexagon. 6 - Tige fémorale selon l'une des revendications 1 à 5, caractérisée en ce que sa partie métaphysaire est recouverte d'un matériau biocompatible poreux favorisant la repousse osseuse, tel que de l'hydroxyapatite de calcium.  6 - Femoral stem according to one of claims 1 to 5, characterized in that its metaphyseal part is covered with a porous biocompatible material promoting bone regrowth, such as calcium hydroxyapatite.
FR9208759A 1992-07-09 1992-07-09 Femoral stem for hip prosthesis. Expired - Lifetime FR2693367B3 (en)

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FR9208759A FR2693367B3 (en) 1992-07-09 1992-07-09 Femoral stem for hip prosthesis.

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FR2693367B3 FR2693367B3 (en) 1994-12-23

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997033538A1 (en) * 1996-03-12 1997-09-18 Societe Civile Groupe Grion Orthopaedic surgery assembly for a hip prosthesis with a removable neck
EP0797964A1 (en) * 1996-03-26 1997-10-01 Groupe Lepine Assembly of elements for the formation of a total hip prosthesis
EP0780106A3 (en) * 1995-12-20 1998-05-13 Bristol-Myers Squibb Company Femoral component of a hip joint endoprosthesis
FR2763501A1 (en) * 1997-05-26 1998-11-27 Groupe Lepine Shoulder prosthesis assembly
WO2000064384A1 (en) * 1999-04-27 2000-11-02 Steinicke Maschinen- Und Werkzeugbau Ag Endoprosthesis, especially for an artificial hip joint
EP1205164A1 (en) 2000-11-07 2002-05-15 Biomet Merck France Hip prosthesis
EP1350486A1 (en) * 2002-04-04 2003-10-08 Aesculap AG & Co. KG Endoprosthesis
US6974483B2 (en) 1998-04-14 2005-12-13 Encore Medical Corporation Modular neck for femur replacement surgery

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7323013B2 (en) 1998-04-14 2008-01-29 Encore Medical Asset Corporation Differential porosity prosthetic hip system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0780106A3 (en) * 1995-12-20 1998-05-13 Bristol-Myers Squibb Company Femoral component of a hip joint endoprosthesis
WO1997033538A1 (en) * 1996-03-12 1997-09-18 Societe Civile Groupe Grion Orthopaedic surgery assembly for a hip prosthesis with a removable neck
FR2746001A1 (en) * 1996-03-12 1997-09-19 Groupe Grion Soc Civ ORTHOPEDIC SURGERY ASSEMBLY FOR HIP PROSTHESIS WITH REMOVABLE NECK
US6190416B1 (en) 1996-03-12 2001-02-20 Groupe Grion Orthopedic surgery assembly for a hip prosthesis with a removable neck
EP0797964A1 (en) * 1996-03-26 1997-10-01 Groupe Lepine Assembly of elements for the formation of a total hip prosthesis
FR2746631A1 (en) * 1996-03-26 1997-10-03 Groupe Lepine SET OF ELEMENTS FOR THE CONSTITUTION OF A TOTAL PROSTHESIS OF THE HIP
FR2763501A1 (en) * 1997-05-26 1998-11-27 Groupe Lepine Shoulder prosthesis assembly
US6974483B2 (en) 1998-04-14 2005-12-13 Encore Medical Corporation Modular neck for femur replacement surgery
WO2000064384A1 (en) * 1999-04-27 2000-11-02 Steinicke Maschinen- Und Werkzeugbau Ag Endoprosthesis, especially for an artificial hip joint
EP1205164A1 (en) 2000-11-07 2002-05-15 Biomet Merck France Hip prosthesis
FR2816827A1 (en) 2000-11-07 2002-05-24 Biomet Merck France HIP PROSTHESIS
EP1350486A1 (en) * 2002-04-04 2003-10-08 Aesculap AG & Co. KG Endoprosthesis

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