FR2925857A1 - Femoral implant for osteopathy patient, has spindle provided with coating having metallic layer and bio-active layer whose thickness decreases from proximal upper part to distal part of spindle - Google Patents

Femoral implant for osteopathy patient, has spindle provided with coating having metallic layer and bio-active layer whose thickness decreases from proximal upper part to distal part of spindle Download PDF

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Publication number
FR2925857A1
FR2925857A1 FR0800014A FR0800014A FR2925857A1 FR 2925857 A1 FR2925857 A1 FR 2925857A1 FR 0800014 A FR0800014 A FR 0800014A FR 0800014 A FR0800014 A FR 0800014A FR 2925857 A1 FR2925857 A1 FR 2925857A1
Authority
FR
France
Prior art keywords
spindle
femoral implant
implant according
bio
layer
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
FR0800014A
Other languages
French (fr)
Other versions
FR2925857B1 (en
Inventor
Philippe Massin
Yves Galline
Sabri Fariborg
Jean Yves Lazennec
Stephane Mauger
Henri Robin
Xavier Artieres
Philippe Soubrane
Claudio Ciampi
Philippe Deroche
Frederic Farizon
Patrick Chapuis
Marc Laine
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.)
CERAM CONCEPT FRANCE SARL SARL
Original Assignee
CERAM CONCEPT FRANCE SARL SARL
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 CERAM CONCEPT FRANCE SARL SARL filed Critical CERAM CONCEPT FRANCE SARL SARL
Priority to FR0800014A priority Critical patent/FR2925857B1/en
Publication of FR2925857A1 publication Critical patent/FR2925857A1/en
Application granted granted Critical
Publication of FR2925857B1 publication Critical patent/FR2925857B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/28—Materials for coating prostheses
    • A61L27/30—Inorganic materials
    • A61L27/32—Phosphorus-containing materials, e.g. apatite
    • 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
    • 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
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • 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
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    • 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
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    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4607—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of hip femoral endoprostheses
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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
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    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30011—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in porosity
    • 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
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    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30032—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in absorbability or resorbability, i.e. in absorption or resorption time
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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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
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    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30062—(bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
    • A61F2002/30064—Coating or prosthesis-covering structure made of biodegradable material
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0008—Rounded shapes, e.g. with rounded corners elliptical or oval
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0023—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in porosity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0026—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in surface structures
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/003—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in adsorbability or resorbability, i.e. in adsorption or resorption time
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness
    • 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
    • A61F2310/00395—Coating or prosthesis-covering structure made of metals or of alloys
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2430/00—Materials or treatment for tissue regeneration
    • A61L2430/02—Materials or treatment for tissue regeneration for reconstruction of bones; weight-bearing implants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2430/00—Materials or treatment for tissue regeneration
    • A61L2430/24—Materials or treatment for tissue regeneration for joint reconstruction

Abstract

The implant has a spindle anchored by impaction in a bone area of a femur, and for fixing a connection head with a hip. The spindle is provided with a coating comprising a rough metallic layer (10) and a bio-active layer (11) based on hydroxyapatite, where thickness of the bio-active layer decreases from a proximal upper part (1b) to a distal part of the spindle. The bio-active layer is realized by depositing the hydroxyapatite through a plasma torch. An independent claim is also included for a method for fabricating a femoral implant.

Description

Implant fémoral La présente invention se rapporte à un implant fémoral. La présente invention se rapporte plus particulièrement à un implant destiné à une prothèse de hanche. The present invention relates to a femoral implant. The present invention relates more particularly to an implant for a hip prosthesis.

10 L'art antérieur connaît déjà des prothèses fémorales et/ou des prothèses de hanche comprenant, notamment, des implants. Ces implants comprennent généralement un fuseau destiné, d'une part, à l'ancrage par impaction dans une zone 15 osseuse du fémur et, d'autre part, à la fixation d'une tête de liaison avec la hanche. The prior art already knows femoral prostheses and / or hip prostheses including, in particular, implants. These implants generally include a spindle for impingement anchoring in a bone region of the femur and for attaching a hip connection head.

Toutefois, avec ces implants, la tenue du fuseau dans la zone d'implantation n'est pas suffisamment forte, en 20 particulier, chez des patients souffrant d'ostéopathie. However, with these implants, spindle holding in the implantation area is not strong enough, particularly in patients with osteopathy.

En outre, la reconstruction osseuse autour du fuseau n'est pas assez rapide ni assez dense du fait que les liaisons à l'interface entre la matière constitutive du 25 fuseau et le tissu osseux ne sont pas favorisées. In addition, bone reconstruction around the spindle is not fast enough or dense enough because the links at the interface between the spindle constitutive material and the bone tissue are not favored.

La présente invention entend remédier à ces problèmes techniques. The present invention intends to remedy these technical problems.

30 Dans ce but, la présente invention propose un implant fémoral du type précédent caractérisé en ce que ledit fuseau est pourvu d'un revêtement comprenant une première couche métallique et une seconde couche bio-active à base d'hydroxyapatite dont l'épaisseur varie de façon décroissante 35 de la partie proximale à la partie distale du fuseau.5 Selon une caractéristique avantageuse, l'épaisseur minimum de la couche bio-active est comprise entre 50 et 80 microns. For this purpose, the present invention provides a femoral implant of the above type characterized in that said spindle is provided with a coating comprising a first metal layer and a second bioactive layer based on hydroxyapatite whose thickness varies from In an advantageous characteristic, the minimum thickness of the bioactive layer is between 50 and 80 microns.

Selon une autre caractéristique, l'épaisseur maximum de la couche bio-active est comprise entre 100 et 150 microns. According to another characteristic, the maximum thickness of the bioactive layer is between 100 and 150 microns.

Selon une variante spécifique, la couche bio-active présente des reliefs. De préférence, lesdits reliefs sont constitués d'une série de pics délimitant des creux intercalaires. According to a specific variant, the bioactive layer has reliefs. Preferably, said reliefs consist of a series of peaks defining intermediate valleys.

Selon une autre caractéristique avantageuse, la couche 15 métallique est rugueuse. According to another advantageous characteristic, the metal layer is rough.

Selon encore une autre caractéristique, l'épaisseur de la couche métallique est décroissante le long du fuseau. According to yet another characteristic, the thickness of the metal layer is decreasing along the spindle.

20 De préférence, ladite couche métallique est poreuse. Preferably, said metal layer is porous.

Un autre objet de l'invention est un procédé de fabrication d'un implant fémoral tel que défini ci-dessus et caractérisé en ce que ladite couche bio-active est réalisée par dépôt 25 d'hydroxyapatite au moyen d'une torche à plasma. Another object of the invention is a method for manufacturing a femoral implant as defined above and characterized in that said bioactive layer is produced by depositing hydroxyapatite by means of a plasma torch.

Selon une caractéristique avantageuse du procédé de l'invention, l'épaisseur de la couche bio-active est maximale sur les surfaces perpendiculaires à l'axe de la 30 torche plasma. According to an advantageous characteristic of the process of the invention, the thickness of the bioactive layer is maximum on the surfaces perpendicular to the axis of the plasma torch.

L'implant fémoral de l'invention assure un ancrage renforcé et durable de la prothèse. The femoral implant of the invention ensures a reinforced and durable anchoring of the prosthesis.

35 Il peL,ctet, en outre, de réduire les contraintes entre la prothèse et le tissu osseux lors des mouvements multidirectionnels de la hanche.10 On comprendra mieux l'invention à l'aide de la description, faite ci-après à titre purement explicatif, d'un 5 mode de réalisation de l'invention, en référence aux figures annexées : It is also possible to reduce the stress between the prosthesis and the bone tissue during multidirectional movements of the hip. The invention will be better understood from the following description purely for the purpose of explanatory text of an embodiment of the invention, with reference to the appended figures:

la figure 1 illustre une vue latérale d'un mode de réalisation du fuseau utilisé dans l'implant de l'invention, la figure 2 illustre une vue en coupe selon AA du fuseau de la figure 1 la figure 3 représente une vue en coupe selon BB du fuseau de la figure 1. FIG. 1 illustrates a side view of an embodiment of the spindle used in the implant of the invention, FIG. 2 illustrates a sectional view along AA of the spindle of FIG. 1; FIG. 3 represents a sectional view according to FIG. BB of the spindle of Figure 1.

L'invention est décrite dans ce qui précède à titre d'exemple. Il est entendu que l'homme du métier est à même de réaliser différentes variantes de l'invention sans pour autant sortir du cadre du brevet. 20 L'implant de l'invention est représenté partiellement sur la figure 1. Sur cette figure, seul le fuseau 1 destiné à l'ancrage dans les tissus osseux du fémur est illustré. 25 Une tête de liaison avec la hanche qui n'est pas représentée, vient, néanmoins, compléter l'implant en venant se fixer dans le logement 2 d'axe X ménagé à la partie supérieure du fuseau The invention is described in the foregoing by way of example. It is understood that the skilled person is able to realize different variants of the invention without departing from the scope of the patent. The implant of the invention is shown partially in Figure 1. In this figure, only the spindle 1 for anchoring in bone tissue of the femur is illustrated. A connecting head with the hip which is not shown, nevertheless comes to complete the implant by being fixed in the housing 2 of axis X arranged at the upper part of the spindle.

30 Le fuseau 1 d'axe longitudinal Y, possède une partie supérieure élargie lb permettant l'impaction au moyen d'un outil de percussion agissant, de préférence, dans la cavité 20 réalisée au sommet et une partie inférieure la à profil 35 effilé, adaptée et destinée à la pénétration forcée dans les tissus osseux à la manière d'un piton. 10 15 La figure 2 représente une vue en coupe selon AA de la partie supérieure lb du fuseau 1. La section du fuseau 1 dans cette zone est sensiblement elliptique. The spindle 1 of longitudinal axis Y has a widened upper portion 1b allowing impaction by means of a percussion tool acting, preferably, in the cavity 20 made at the top and a lower part 1a with a tapered profile. adapted and intended for forced penetration into the bone tissue in the manner of a peak. Figure 2 shows a sectional view along AA of the upper portion 1b of the spindle 1. The spindle section 1 in this area is substantially elliptical.

Le fuseau 1 est pourvu, sur au moins sa partie inférieure, d'un revêtement comprenant une première couche métallique et une seconde couche bio-active 11. Le matériau bio-actif est, de préférence, un composé à 10 base d'hydroxyapatite (HAP). The spindle 1 is provided on at least its lower part with a coating comprising a first metal layer and a second bioactive layer 11. The bioactive material is preferably a hydroxyapatite-based compound ( PAH).

La seconde couche est destinée à se résorber au fur et à mesure de la reconstruction osseuse autour du fuseau. The second layer is intended to be absorbed as bone reconstruction around the spindle.

15 De manière inattendue, il a été trouvé que la résorption osseuse est plus limitée et plus lente dans les zones corticales des tissus entourant le fuseau, c'est à dire en périphérie, que dans les zones médullaires située au coeur de l'os. 20 Il est donc prévu, selon l'invention, que l'épaisseur de la seconde couche varie de façon décroissante de la partie supérieure proximale lb dont la section est la plus grande à la partie inférieure distale la du fuseau où la section est 25 la plus faible. Unexpectedly, it has been found that bone resorption is more limited and slower in the cortical areas of the tissues surrounding the spindle, ie in the periphery, than in the medullary areas located in the heart of the bone. According to the invention, it is therefore provided that the thickness of the second layer decreases in a decreasing manner from the proximal upper portion 1b whose section is greatest to the distal lower portion 1a of the spindle where the section is the weaker.

L'épaisseur minimum de la seconde couche 11 est comprise entre 50 et 80 microns tandis que son épaisseur maximum est comprise entre 100 et 150 microns. 30 La couche bio-active 11 présente des reliefs, en particulier dans la partie inférieure la du fuseau. The minimum thickness of the second layer 11 is between 50 and 80 microns while its maximum thickness is between 100 and 150 microns. The bioactive layer 11 has reliefs, particularly in the lower part of the spindle.

Ces reliefs sont constitués d'une série de pics lla 35 délimitant des creux intercalaires llb, comme représenté sur la figure 3. 15 La couche métallique 10 est réalisée avec un matériau présentant une rugosité permettant l'accrochage de la seconde couche puis, après résorption, du tissu osseux environnant et, le cas échéant, également une porosité 5 interne. These reliefs consist of a series of peaks lla 35 delimiting interfering recesses llb, as shown in FIG. 3. The metal layer 10 is made of a material having a roughness allowing the second layer to be hooked and, after resorption , surrounding bone tissue and, if appropriate, also internal porosity.

L'épaisseur de la couche métallique 10 est aussi décroissante le long du fuseau 1 en direction de son 10 extrémité effilée. The thickness of the metal layer 10 is also decreasing along the spindle 1 towards its tapered end.

La couche bio-active 11 du revêtement du fuseau 1 de l'invention est réalisée par un dépôt d'hydroxyapatite au moyen d'une torche à plasma. L'épaisseur de la couche bio-active 11 est maximale sur les surfaces perpendiculaires à l'axe de la torche plasma. Les zones d'épaisseur plus importante peuvent correspondre aux pics lia. 20 10 15 20 25 30 35 The bioactive layer 11 of the spindle coating 1 of the invention is produced by a hydroxyapatite deposit by means of a plasma torch. The thickness of the bioactive layer 11 is maximum on the surfaces perpendicular to the axis of the plasma torch. Areas of greater thickness may correspond to peaks 11a. 20 10 15 20 25 30 35

Claims (10)

REVENDICATIONS 1. Implant fémoral comprenant un fuseau (1) destiné, d'une part, à l'ancrage par impaction dans une zone osseuse du fémur et, d'autre part, à la fixation d'une tête de liaison avec la hanche, caractérisé en ce que ledit fuseau (1) est pourvu d'un revêtement comprenant une première couche métallique (10) et une seconde couche bio-active (11) à base d'hydroxyapatite dont l'épaisseur varie de façon décroissante de la partie proximale (lb) à la partie distale (la) du fuseau. Femoral implant comprising a spindle (1) intended, on the one hand, for impaction anchoring in a bone zone of the femur and, on the other hand, for fixing a connecting head with the hip, characterized in that said spindle (1) is provided with a coating comprising a first metal layer (10) and a second bioactive layer (11) based on hydroxyapatite, the thickness of which varies decreasingly from the proximal portion ( lb) at the distal end (la) of the spindle. 2. Implant fémoral selon la revendication 1, caractérisé en ce que l'épaisseur minimum de la couche bio-active (11) est comprise entre 50 et 80 microns. 2. femoral implant according to claim 1, characterized in that the minimum thickness of the bio-active layer (11) is between 50 and 80 microns. 3. Implant fémoral selon l'une des revendications précédentes, caractérisé en ce que l'épaisseur maximum de la couche bio-active (11) est comprise entre 100 et 150 microns. 3. femoral implant according to one of the preceding claims, characterized in that the maximum thickness of the bio-active layer (11) is between 100 and 150 microns. 4. Implant fémoral selon l'une des revendications précédentes, caractérisé en ce que la couche bioactive (11) présente des reliefs (lla). 4. femoral implant according to one of the preceding claims, characterized in that the bioactive layer (11) has reliefs (lla). 5. Implant fémoral selon la revendication 4, caractérisé en ce que lesdits reliefs sont constitués d'une série de pics (lla) délimitant des creux intercalaires (lib). 5. femoral implant according to claim 4, characterized in that said reliefs consist of a series of peaks (11a) delimiting inter-valleys (lib). 6. Implant fémoral selon l'une des revendications précédentes, caractérisé en ce que la couche métallique (10) est rugueuse. Femoral implant according to one of the preceding claims, characterized in that the metal layer (10) is rough. 7. Implant fémoral selon l'une quelconque des revendications précédentes, caractérisé en ce que l'épaisseur de la couche métallique est décroissante le long du fuseau. 10 7. femoral implant according to any one of the preceding claims, characterized in that the thickness of the metal layer is decreasing along the spindle. 10 8. Implant fémoral selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche métallique est poreuse. 8. femoral implant according to any one of the preceding claims, characterized in that said metal layer is porous. 9. Procédé de fabrication d'un implant fémoral selon l'une des revendications précédentes, caractérisé en ce que ladite couche bio- active (11) est réalisée par dépôt d'hydroxyapatite au moyen d'une torche à plasma. 9. A method of manufacturing a femoral implant according to one of the preceding claims, characterized in that said bioactive layer (11) is produced by deposition of hydroxyapatite by means of a plasma torch. 10.Procédé de fabrication d'un implant fémoral selon la revendication 9, caractérisé en ce que l'épaisseur de la couche bio- active (il) est maximale sur les surfaces perpendiculaires à l'axe de la torche plasma. 10. A method of manufacturing a femoral implant according to claim 9, characterized in that the thickness of the bioactive layer (II) is maximum on the surfaces perpendicular to the axis of the plasma torch.
FR0800014A 2008-01-02 2008-01-02 FEMORAL IMPLANT Expired - Fee Related FR2925857B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19543530C1 (en) * 1995-11-22 1997-05-07 Eska Implants Gmbh & Co Bone replacement implant
FR2851456A1 (en) * 2003-02-26 2004-08-27 Groupe Lepine Femoral prosthesis implant has axes of neck and shank at an angle of 130 degrees and porous metal coating on shank with thickness decreasing towards tip

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19543530C1 (en) * 1995-11-22 1997-05-07 Eska Implants Gmbh & Co Bone replacement implant
FR2851456A1 (en) * 2003-02-26 2004-08-27 Groupe Lepine Femoral prosthesis implant has axes of neck and shank at an angle of 130 degrees and porous metal coating on shank with thickness decreasing towards tip

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