WO1997041809A1 - Intra-bone implant - Google Patents

Intra-bone implant Download PDF

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Publication number
WO1997041809A1
WO1997041809A1 PCT/FR1996/000671 FR9600671W WO9741809A1 WO 1997041809 A1 WO1997041809 A1 WO 1997041809A1 FR 9600671 W FR9600671 W FR 9600671W WO 9741809 A1 WO9741809 A1 WO 9741809A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
implant according
rod
bone
intraosseous implant
Prior art date
Application number
PCT/FR1996/000671
Other languages
French (fr)
Inventor
Fernand Le Coent
Original Assignee
Bmp S.A.
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 Bmp S.A. filed Critical Bmp S.A.
Priority to PCT/FR1996/000671 priority Critical patent/WO1997041809A1/en
Priority to AU58241/96A priority patent/AU5824196A/en
Publication of WO1997041809A1 publication Critical patent/WO1997041809A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0086Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools with shock absorbing means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30721Accessories
    • A61F2/30749Fixation appliances for connecting prostheses to the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3662Femoral shafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/38Joints for elbows or knees
    • A61F2/389Tibial components
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004Material 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
    • A61F2002/30014Material 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 elasticity, stiffness or compressibility
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30112Rounded shapes, e.g. with rounded corners
    • A61F2002/30136Rounded shapes, e.g. with rounded corners undulated or wavy, e.g. serpentine-shaped or zigzag-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/30199Three-dimensional shapes
    • A61F2002/30224Three-dimensional shapes cylindrical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/3082Grooves
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2002/30929Special external or bone-contacting surface, e.g. coating for improving bone ingrowth having at least two superposed coatings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0008Fixation appliances for connecting prostheses to the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0069Three-dimensional shapes cylindrical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014Special 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
    • A61F2250/0018Special 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 elasticity, stiffness or compressibility
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00011Metals or alloys
    • A61F2310/00023Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389The prosthesis being coated or covered with a particular material
    • A61F2310/00592Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Definitions

  • Intraosseous implant Intraosseous implant.
  • the present invention relates to an intraosseous implant for producing dental implants, knee, hip, shoulder or other joints.
  • prostheses known to date such as hip, knee, shoulder or tooth prostheses are prostheses produced by means of rigid rods and machined in various shapes. Therefore, it is impossible to uniformly distribute the functional stresses on the bone structure.
  • most of the replaced organs are naturally organs having mobility with a variable elastic modulus. So, for example, in the root of a tooth, mobility is obtained by a membrane called the desmodont. The infrastructure or the suprastructure should therefore take into account this mobility and the shock absorption which must result from it. Otherwise, because the implant and the bone are not subjected to the same stresses, there is quickly a degeneration of the support bone.
  • Such an intraosseous implant has in particular been proposed in European patent EP-A-370,590 in which a dental implant is described which comprises a basic body capable of receiving an implant rod, a spacer sleeve housed in the the open end of the base body and an intermediate element of elastic material which perfectly surrounds the implant rod concentrically.
  • the shock absorbing element is placed between the implant and the suprastructure outside the bone area. Therefore, there is, when using such an implant, a rupture of the stem of the implant at this shock absorbing element because the stem of the implant tends to work at the torsion causing it to break.
  • the object of the invention is therefore to overcome the aforementioned drawbacks by proposing an intraosseous implant which allows the transmission of forces from the superstructure to the infrastructure without causing any breakage or particular wear of the prosthesis while restoring in the superstructure the mobility and resilience of the replaced natural organ.
  • an intraosseous implant of the type comprising a generally cylindrical base body forming a rod, permanently installed in the bone, a substitution assembly intended to reform the superstructure of the organ to be replaced, this superstructure being formed in one piece with said body or fixed to the latter, characterized in that the basic body forming a rod is formed, from the center of the body towards its periphery, at least three superimposed layers, an internal layer constituting the core of said body made of a metallic or composite material, an intermediate layer, continuous or discontinuous, elastically deformable, intended to reconstitute the resilience of the superstructure of a natural organ by absorbing shock and by distributing the functional stresses on the surface of the bone and an external metallic layer forming an osteo-integrable envelope.
  • the internal layer and the external layer of the base body are interconnected in the vicinity of the superosseous area, to delimit between them a closed space more or less filled by said intermediate layer .
  • FIG. 1 represents a view in longitudinal section of an implant rod of a femoral prosthesis
  • Figure 2 shows a longitudinal sectional view of a dental implant rod
  • FIG. 3 shows a sectional view along A-A of Figure 1;
  • Figures 4 and 5 show partial sectional views of the connection area between layers internal and external of the basic body in the vicinity of the suprosseous zone.
  • the intraosseous implant, object of the invention comprises a base body 5, generally cylindrical, forming a rod, preferably closed at at least one of its ends, and permanently installed in the bone 4.
  • a blind, generally cylindrical cavity with a rounded bottom in the bone to allow the positioning of the base body 5 of the implant in the bone 4.
  • This base body 5 may be hollow or full depending on the substitution assembly 6 intended to form the superstructure of the member to be replaced.
  • the base body 5 can be formed in one piece with the superstructure to constitute for example a femoral prosthesis or a tibial plateau, but this base body 5 can also, as shown Figure 2, affect the shape of a hollow body having a tapped blind hole open towards the substitution assembly 6 to allow the screwing of the substitution assembly 6, constituted here, in this case, by an implant dental.
  • this internal thread of the implant can be used for other purposes; in particular, it is used at the time of implantation of the base body 5 to allow the fixing of a titanium screw, the head of which comes close to the implant. This screw is intended to protect this tapping during the period of placing in nurse, period during which the bone 4 and the gum 7 are reconstituted.
  • This base body 5 is a laminate produced by superposition of at least three layers, an internal layer 1 constituting the core of said body made of a metallic or composite material, preferably metallic, an intermediate layer 2, continuous or discontinuous, elastically. deformable which constitutes the shock absorbing element of said body and an external layer 3 forming an osteo-integrable envelope.
  • the outer layer 3 is generally made of a very ductile material which can be rehabilitated by bone, for example, a very pure titanium treated with plasma.
  • Metallic materials such as titanium or titanium alloys can also be used for the production of this envelope, combined with a particular surface treatment, for example a treatment based on a bioactive mineral powder, such as a salt. calcium phosphate or hydroxyapatite to promote osteosynthesis and integration of the implant in the bone.
  • This outer layer 3 will therefore be made of metal, this metal possibly having been able to undergo a surface treatment.
  • the outer layer 3 may have at least at its surface undulations as shown in FIG. 1. Depending on the thickness of this envelope 3, these undulations may be present only at the surface of said layer or, on the contrary, spread over the entire thickness of the layer.
  • the profile of the intermediate layer 2 will have to adapt to this particular profile of the external layer 3.
  • These undulations are generally arranged so that reliefs and hollows alternate regularly or irregularly in the lengthwise direction of the base body 5 as shown in FIG. 1. This corrugated profile of the external layer 3 promotes the anchoring of the implant in the bone and the deformation without rupture of said implant.
  • the inner layer 1 is made of a preferably metallic material.
  • the most frequently used metallic materials are titanium and titanium alloys.
  • the intermediate layer 2 must be elastically deformable. Several materials can therefore be selected for its realization based in particular on its design Thus, in the case where this intermediate layer 2 is in the form of a membrane, it will generally be made of rubber or by means of linear or crosslinked elastomers. Crosslinked elastomers will be preferred. By way of example, mention may be made of the following materials: silicone, polyisoprene, polyurethane, high molecular weight polyolefins, etc.
  • This intermediate layer can also consist of a viscoelastic material which at least partially fills the free space between the internal layer 1 and the external layer 3. This intermediate layer 2 can be produced by injecting said viscoelastic material into the free space between the inner layer 1 and the outer layer 3 previously shaped.
  • these layers 1, 2 and 3 can be joined together.
  • the inner layer 1 and the outer layer 3 will for example have, on the surface of their face opposite, means for anchoring the intermediate layer 2.
  • These anchoring means may for example be formed by projecting members of said layers or on the contrary by recesses in said layers, in particular when the intermediate layer 2 is made of a viscoelastic material.
  • These recesses or projections can be obtained by an appropriate surface treatment such as sandblasting, micro-billing or pickling with acid.
  • the thickness of the intermediate layer 2 which can be a continuous or discontinuous layer, can be either constant, as shown in FIG. 1, or variable, as shown in FIG. 2.
  • the thickness of the intermediate layer 2 which can be a continuous or discontinuous layer, can be either constant, as shown in FIG. 1, or variable, as shown in FIG. 2.
  • a distinction will be made between thin portions 2 1 and very thick portions 2 ⁇ , as well as intermediate thickness portions 2 3 .
  • This possibility of being able to play on the section of the intermediate layer 2, as shown in FIG. 2 makes it possible to optimize the distribution of the forces on the envelope 3 and to obtain a variable elastic modulus.
  • the inner layer 1 and the outer layer 3 will delimit a closed or open intermediate space.
  • the generally annular opening of this space is situated above the bone zone to avoid any risk infection.
  • Such a solution is for example retained for the production of a tibial plateau or in the case of a dental implant as shown in FIG. 2.
  • the opening of this space is located in the area of supragengival junction.
  • the internal layer 1 and the external layer 3 of the base body can be connected together in the vicinity of their free edge to delimit between them a closed space more or less filled by said layer intermediate 2.
  • the intermediate space, delimited by the internal layer 1 and the envelope 3 will only be partially filled by the intermediate layer 2 made of an elastically deformable material so as to provide, in the vicinity of the zone of junction of layers 1 and 3, an empty space.

Abstract

The invention discloses an intra-bone implant. This implant is characterised in that the basic body (5) forming the stem is made up, from the body centre to the periphery, of at least three superimposed layers, an internal layer (1) consituting the core of the said body, made of a metallic or composite material, the intermediate, continuous or discontinuous, elastically deformable, layer (2), to reconstitute the resilience of the superstructure of a natural organ in absorbing shocks and spreading functional stresses over the bone surface, an external metallic layer (3) forming an envelope capable of being integrated to the bone. The invention is useful to effect dental implants, and implants for knee, hip, shoulder and other joints.

Description

Implant intra-osseux. Intraosseous implant.
La présente invention concerne un implant intra-osseux pour la réalisation d'implant dentaire, d'articulation de genou, de hanche, d'épaule ou autre.The present invention relates to an intraosseous implant for producing dental implants, knee, hip, shoulder or other joints.
La plupart des prothèses connues à ce jour, telles que les prothèses de hanche, de genou, d'épaule ou de dent sont des prothèses réalisées au moyen de tiges rigides et usinées dans des formes diverses. De ce fait, il est impossible de répartir uniformément les contraintes fonctionnelles sur la structure de l'os. Or, la plupart des organes remplacés sont à l'état naturel des organes présentant une mobilité avec un module élastique variable. Ainsi, par exemple, dans la racine d'une dent, la mobilité est obtenue par une membrane appelée desmodonte. L'infrastructure ou la suprastructure devraient donc prendre en compte cette mobilité et l'absorption des chocs qui doit en résulter. Dans le cas contraire, du fait que l'implant et l'os ne sont pas soumis aux mêmes contraintes, on constate rapidement une dégénérescence de l'os support.Most prostheses known to date, such as hip, knee, shoulder or tooth prostheses are prostheses produced by means of rigid rods and machined in various shapes. Therefore, it is impossible to uniformly distribute the functional stresses on the bone structure. However, most of the replaced organs are naturally organs having mobility with a variable elastic modulus. So, for example, in the root of a tooth, mobility is obtained by a membrane called the desmodont. The infrastructure or the suprastructure should therefore take into account this mobility and the shock absorption which must result from it. Otherwise, because the implant and the bone are not subjected to the same stresses, there is quickly a degeneration of the support bone.
Certains industriels ont réussi à résoudre partiellement ce problème en proposant des implants susceptibles d'imiter plus ou moins bien la resilience et le module d'élasticité de l'organe naturel. Un tel implant intra-osseux a notamment été proposé dans le brevet européen EP-A-370.590 dans lequel il est décrit un implant dentaire qui comporte un corps de base susceptible de recevoir une tige d'implant, une douille d'écartement logée dans l'extrémité ouverte du corps de base et un élément intermédiaire en matériau élastique qui entoure parfaitement la tige d'implant de manière concentrique. Dans ce brevet, l'élément d'absorption de choc est placé entre l'implant et la suprastructure en dehors de la zone osseuse. De ce fait, on constate, lors de l'utilisation d'un tel implant, une rupture de la tige de l'implant au niveau de cet élément d'absorption de choc car la tige de l'implant a tendance à travailler à la torsion entraînant sa rupture.Some manufacturers have succeeded in partially solving this problem by proposing implants likely to imitate more or less well the resilience and the modulus of elasticity of the natural organ. Such an intraosseous implant has in particular been proposed in European patent EP-A-370,590 in which a dental implant is described which comprises a basic body capable of receiving an implant rod, a spacer sleeve housed in the the open end of the base body and an intermediate element of elastic material which perfectly surrounds the implant rod concentrically. In this patent, the shock absorbing element is placed between the implant and the suprastructure outside the bone area. Therefore, there is, when using such an implant, a rupture of the stem of the implant at this shock absorbing element because the stem of the implant tends to work at the torsion causing it to break.
D'autres implants dits composites ont été mis au point. Ces implants se caractérisent par un module d'élasticité variable sur la longueur de ladite structure de manière à s'adapter à la rigidité correspondante de l'os contigu à ladite structure après l'implantation de cette dernière dans l'os. De tels implants, à base essentiellement de fibres de carbone et d'un liant, ne sont pas biocompatibles en raison des matériaux utilisés. En outre, la présence de fibres provoque une réponse immunitaire très brutale du corps humain qui peut parfois s'avérer dangereuse.Other so-called composite implants have been developed. These implants are characterized by a variable elastic modulus over the length of said structure so as to adapt to the corresponding rigidity of the bone contiguous to said structure after the implantation of the latter in the bone. Such implants, essentially based on carbon fibers and a binder, are not biocompatible because of the materials used. In addition, the presence of fibers provokes a very brutal immune response of the human body which can sometimes prove to be dangerous.
Le but de l'invention est donc de pallier les inconvénients précités en proposant un implant intra-osseux qui permette la transmission des efforts de la superstructure à l'infrastructure sans entraîner de rupture ni d'usure particulières de la prothèse tout en reconstituant dans la superstructure la mobilité et la resilience de l'organe naturel remplacé.The object of the invention is therefore to overcome the aforementioned drawbacks by proposing an intraosseous implant which allows the transmission of forces from the superstructure to the infrastructure without causing any breakage or particular wear of the prosthesis while restoring in the superstructure the mobility and resilience of the replaced natural organ.
L'invention concerne à cet effet un implant intra-osseux, du type comprenant un corps de base généralement cylindrique formant tige, installé à demeure dans l'os, un ensemble de substitution destiné à reformer la superstructure de l'organe à remplacer, cette superstructure étant formée d'une seule pièce avec ledit corps ou fixée à ce dernier, caractérisé en ce que le corps de base formant tige est formé, du centre du corps vers sa périphérie, d'au moins trois couches superposées, une couche interne constituant l'âme dudit corps réalisée en un matériau métallique ou composite, une couche intermédiaire, continue ou discontinue, élastiquement deformable, destinée à reconstituer la resilience de la superstructure d'un organe naturel en absorbant les chocs et en répartissant les contraintes fonctionnelles à la surface de l'os et une couche externe métallique formant une enveloppe ostéo- intégrable.To this end, the invention relates to an intraosseous implant, of the type comprising a generally cylindrical base body forming a rod, permanently installed in the bone, a substitution assembly intended to reform the superstructure of the organ to be replaced, this superstructure being formed in one piece with said body or fixed to the latter, characterized in that the basic body forming a rod is formed, from the center of the body towards its periphery, at least three superimposed layers, an internal layer constituting the core of said body made of a metallic or composite material, an intermediate layer, continuous or discontinuous, elastically deformable, intended to reconstitute the resilience of the superstructure of a natural organ by absorbing shock and by distributing the functional stresses on the surface of the bone and an external metallic layer forming an osteo-integrable envelope.
Selon une forme de réalisation préférée de l'invention, la couche interne et la couche externe du corps de base sont reliées entre elles au voisinage de la zone supra-osseuse, pour délimiter entre elles un espace fermé plus ou moins rempli par ladite couche intermédiaire.According to a preferred embodiment of the invention, the internal layer and the external layer of the base body are interconnected in the vicinity of the superosseous area, to delimit between them a closed space more or less filled by said intermediate layer .
L'invention sera bien comprise à la lecture de la description suivante d'exemples de réalisation, en référence aux dessins annexés dans lesquels :The invention will be clearly understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:
la figure 1 représente une vue en coupe longitudinale d'une tige d'implant d'une prothèse fémorale ;FIG. 1 represents a view in longitudinal section of an implant rod of a femoral prosthesis;
la figure 2 représente une vue en coupe longitudinale d'une tige d'implant dentaire ;Figure 2 shows a longitudinal sectional view of a dental implant rod;
la figure 3 représente une vue en coupe suivant A-A de la figure 1 ;3 shows a sectional view along A-A of Figure 1;
les figures 4 et 5 représentent des vues en coupe partielles de la zone de liaison entre couches interne et externe du corps de base au voisinage de la zone supra-osseuse.Figures 4 and 5 show partial sectional views of the connection area between layers internal and external of the basic body in the vicinity of the suprosseous zone.
Comme le montrent les figures 1 et 2, l'implant intra- osseux, objet de l'invention, comprend un corps de base 5, généralement cylindrique, formant tige, de préférence fermé à au moins une de ses extrémités, et installé à demeure dans l'os 4. Il peut être ainsi ménagé une cavité borgne généralement cylindrique à fond arrondi dans l'os pour permettre le positionnement du corps de base 5 de 1 ' implant dans l'os 4. Ce corps de base 5 peut être creux ou plein en fonction de l'ensemble de substitution 6 destiné à former la superstructure de l'organe à remplacer. En effet, comme le montre la figure 1, le corps de base 5 peut être formé d'une seule pièce avec la superstructure pour constituer par exemple une prothèse fémorale ou un plateau tibial, mais ce corps de base 5 peut également, comme le montre la figure 2, affecter la forme d'un corps creux présentant un orifice borgne taraudé ouvert en direction de l'ensemble de substitution 6 pour permettre le vissage de l'ensemble de substitution 6, constitué ici, en l'occurrence, par un implant dentaire. Bien évidemment, ce taraudage interne de l'implant pourra être utilisé dans d'autres buts ; en particulier, il est utilisé au moment de l'implantation du corps de base 5 pour permettre la fixation d'une vis en titane dont la tête arrive au ras de l'implant. Cette vis est destinée à protéger ce taraudage pendant la période de mise en nourrice, période pendant laquelle l'os 4 et la gencive 7 se reconstituent.As shown in Figures 1 and 2, the intraosseous implant, object of the invention, comprises a base body 5, generally cylindrical, forming a rod, preferably closed at at least one of its ends, and permanently installed in the bone 4. There may thus be provided a blind, generally cylindrical cavity with a rounded bottom in the bone to allow the positioning of the base body 5 of the implant in the bone 4. This base body 5 may be hollow or full depending on the substitution assembly 6 intended to form the superstructure of the member to be replaced. Indeed, as shown in Figure 1, the base body 5 can be formed in one piece with the superstructure to constitute for example a femoral prosthesis or a tibial plateau, but this base body 5 can also, as shown Figure 2, affect the shape of a hollow body having a tapped blind hole open towards the substitution assembly 6 to allow the screwing of the substitution assembly 6, constituted here, in this case, by an implant dental. Obviously, this internal thread of the implant can be used for other purposes; in particular, it is used at the time of implantation of the base body 5 to allow the fixing of a titanium screw, the head of which comes close to the implant. This screw is intended to protect this tapping during the period of placing in nurse, period during which the bone 4 and the gum 7 are reconstituted.
Ce corps de base 5 est un stratifié réalisé par superposition d'au moins trois couches, une couche interne 1 constituant l'âme dudit corps réalisée en un matériau métallique ou composite, de préférence métallique, une couche intermédiaire 2, continue ou discontinue, élastiquement deformable qui constitue l'élément d'absorption des chocs dudit corps et une couche externe 3 formant une enveloppe ostéo-intégrable. La couche externe 3 est généralement réalisée dans un matériau très ductile et réhabitable par l'os, par exemple, un titane très pur traité au plasma. On peut également utiliser, pour la réalisation de cette enveloppe, des matériaux métalliques tels que du titane ou des alliages de titane combinés à un traitement de surface particulier, par exemple un traitement à base d'une poudre minérale bioactive, telle qu'un sel de phosphate de calcium ou de l'hydroxyapatite pour favoriser l'ostéosynthèse et l'intégration de l'implant dans l'os. La qualité essentielle des matériaux utilisés pour cette enveloppe réside d'une part dans la biocompatibilité des matériaux, d'autre part, dans les caractéristiques de résistance à la fatigue desdits matériaux. Cette couche externe 3 sera donc réalisée en métal, ce métal ayant pu éventuellement subir un traitement de surface. En outre, la couche externe 3 pourra présenter au moins à sa surface des ondulations comme le montre la figure 1. Selon l'épaisseur de cette enveloppe 3, ces ondulations pourront être présentes uniquement en surface de ladite couche ou, au contraire, s'étendre sur toute l'épaisseur de la couche. Dans ce cas, le profil de la couche intermédiaire 2 devra s'adapter à ce profil particulier de la couche externe 3. Ces ondulations sont généralement disposées de telle sorte que reliefs et creux alternent de manière régulière ou irrégulière dans le sens de la longueur du corps de base 5 comme le montre la figure 1. Ce profil ondulé de la couche externe 3 favorise l'ancrage de l'implant dans l'os et la déformation sans rupture dudit implant.This base body 5 is a laminate produced by superposition of at least three layers, an internal layer 1 constituting the core of said body made of a metallic or composite material, preferably metallic, an intermediate layer 2, continuous or discontinuous, elastically. deformable which constitutes the shock absorbing element of said body and an external layer 3 forming an osteo-integrable envelope. The outer layer 3 is generally made of a very ductile material which can be rehabilitated by bone, for example, a very pure titanium treated with plasma. Metallic materials such as titanium or titanium alloys can also be used for the production of this envelope, combined with a particular surface treatment, for example a treatment based on a bioactive mineral powder, such as a salt. calcium phosphate or hydroxyapatite to promote osteosynthesis and integration of the implant in the bone. The essential quality of the materials used for this envelope resides on the one hand in the biocompatibility of the materials, on the other hand, in the characteristics of resistance to fatigue of said materials. This outer layer 3 will therefore be made of metal, this metal possibly having been able to undergo a surface treatment. In addition, the outer layer 3 may have at least at its surface undulations as shown in FIG. 1. Depending on the thickness of this envelope 3, these undulations may be present only at the surface of said layer or, on the contrary, spread over the entire thickness of the layer. In this case, the profile of the intermediate layer 2 will have to adapt to this particular profile of the external layer 3. These undulations are generally arranged so that reliefs and hollows alternate regularly or irregularly in the lengthwise direction of the base body 5 as shown in FIG. 1. This corrugated profile of the external layer 3 promotes the anchoring of the implant in the bone and the deformation without rupture of said implant.
La couche interne 1 est quant à elle constituée d'un matériau de préférence métallique. Les matériaux métalliques les plus fréquemment utilisés sont le titane et les alliages de titane.The inner layer 1 is made of a preferably metallic material. The most frequently used metallic materials are titanium and titanium alloys.
La couche intermédiaire 2 doit quant à elle être élastiquement deformable. Plusieurs matériaux peuvent donc être retenus pour sa réalisation en fonction notamment de sa conception. Ainsi, dans le cas où cette couche intermédiaire 2 se présente sous la forme d'une membrane, elle sera généralement réalisée en caoutchouc ou au moyen d'élastomères linéaires ou réticulés. Les élastomères réticulés seront préférés. A titre d'exemple, on peut citer les matériaux suivants : le silicone, le polyisoprène, le polyuréthanne, les polyoléfines à haut poids moléculaire, etc. Cette couche intermédiaire peut également être constituée d'une matière viscoélastique qui remplit au moins partiellement l'espace libre entre la couche interne 1 et la couche externe 3. Cette couche intermédiaire 2 peut être réalisée par injection de ladite matière viscoélastique dans l'espace libre entre la couche interne 1 et la couche externe 3 préalablement conformées. Bien évidemment, ces couches 1, 2 et 3 peuvent être solidarisées entre elles. Pour permettre une liaison des couches entre elles, la couche interne 1 et la couche externe 3 présenteront par exemple à la surface de leur face en regard des moyens d'ancrage de la couche intermédiaire 2. Ces moyens d'ancrage peuvent par exemple être constitués par des organes en saillie desdites couches ou au contraire par des évidements dans lesdites couches, en particulier lorsque la couche intermédiaire 2 est réalisée en un matériau viscoélastique. Ces évidements ou saillies peuvent être obtenus par un traitement de surface approprié tel qu'un sablage, un micro-billage ou un décapage à l'acide.The intermediate layer 2 must be elastically deformable. Several materials can therefore be selected for its realization based in particular on its design Thus, in the case where this intermediate layer 2 is in the form of a membrane, it will generally be made of rubber or by means of linear or crosslinked elastomers. Crosslinked elastomers will be preferred. By way of example, mention may be made of the following materials: silicone, polyisoprene, polyurethane, high molecular weight polyolefins, etc. This intermediate layer can also consist of a viscoelastic material which at least partially fills the free space between the internal layer 1 and the external layer 3. This intermediate layer 2 can be produced by injecting said viscoelastic material into the free space between the inner layer 1 and the outer layer 3 previously shaped. Obviously, these layers 1, 2 and 3 can be joined together. To allow the layers to be bonded together, the inner layer 1 and the outer layer 3 will for example have, on the surface of their face opposite, means for anchoring the intermediate layer 2. These anchoring means may for example be formed by projecting members of said layers or on the contrary by recesses in said layers, in particular when the intermediate layer 2 is made of a viscoelastic material. These recesses or projections can be obtained by an appropriate surface treatment such as sandblasting, micro-billing or pickling with acid.
L'épaisseur de la couche intermédiaire 2, qui peut être une couche continue ou discontinue, peut être soit constante, comme le montre la figure 1, soit variable, comme le montre la figure 2. Ainsi, dans le cas de la figure 2, on distinguera des portions de faible épaisseur 21 et des portions de grande épaisseur 2^, ainsi que des portions d'épaisseur intermédiaire 23. Cette possibilité de pouvoir jouer sur la section de la couche intermédiaire 2, comme le montre la figure 2, permet d'optimiser la répartition des forces sur l'enveloppe 3 et d'obtenir un module élastique variable.The thickness of the intermediate layer 2, which can be a continuous or discontinuous layer, can be either constant, as shown in FIG. 1, or variable, as shown in FIG. 2. Thus, in the case of FIG. 2, a distinction will be made between thin portions 2 1 and very thick portions 2 ^, as well as intermediate thickness portions 2 3 . This possibility of being able to play on the section of the intermediate layer 2, as shown in FIG. 2, makes it possible to optimize the distribution of the forces on the envelope 3 and to obtain a variable elastic modulus.
De même, en fonction de l'implant à réaliser, la couche interne 1 et la couche externe 3 délimiteront un espace intermédiaire fermé ou ouvert. Ainsi, comme le montre la figure 4, dans le cas où la couche interne 1 et la couche externe 3 délimitent entre elles un espace ouvert, l'ouverture généralement annulaire de cet espace est située au-dessus de la zone osseuse pour éviter tout risque d'infection. Une telle solution est par exemple retenue pour la réalisation d'un plateau tibial ou dans le cas d'un implant dentaire tel que représenté à la figure 2. Là encore, on constatera que l'ouverture de cet espace est située dans la zone de jonction supragengivale. A l'inverse, et conformément à la figure 5, la couche interne 1 et la couche externe 3 du corps de base peuvent être reliées entre elles au voisinage de leur bord libre pour délimiter entre elles un espace fermé plus ou moins rempli par ladite couche intermédiaire 2. Dans ce cas, l'espace intermédiaire, délimité par la couche interne 1 et l'enveloppe 3, ne sera que partiellement rempli par la couche intermédiaire 2 réalisée en une matière élastiquement deformable de manière à ménager, au voisinage de la zone de jonction des couches 1 et 3, un espace vide.Similarly, depending on the implant to be produced, the inner layer 1 and the outer layer 3 will delimit a closed or open intermediate space. Thus, as shown in FIG. 4, in the case where the internal layer 1 and the external layer 3 delimit between them an open space, the generally annular opening of this space is situated above the bone zone to avoid any risk infection. Such a solution is for example retained for the production of a tibial plateau or in the case of a dental implant as shown in FIG. 2. Here again, it will be noted that the opening of this space is located in the area of supragengival junction. Conversely, and in accordance with FIG. 5, the internal layer 1 and the external layer 3 of the base body can be connected together in the vicinity of their free edge to delimit between them a closed space more or less filled by said layer intermediate 2. In this case, the intermediate space, delimited by the internal layer 1 and the envelope 3, will only be partially filled by the intermediate layer 2 made of an elastically deformable material so as to provide, in the vicinity of the zone of junction of layers 1 and 3, an empty space.
Comme le montrent les figures 1, 3 et 5, à partir d'une même solution de base concernant le corps de base de l'implant, il est possible d'élaborer un grand nombre de prothèses. As shown in Figures 1, 3 and 5, from the same basic solution for the basic body of the implant, it is possible to develop a large number of prostheses.

Claims

REVENDICATIONS
1. Implant intra-osseux, du type comprenant un corps de base (5) généralement cylindrique formant tige, installé à demeure dans l'os, un ensemble de substitution (6) destiné à reformer la superstructure de l'organe à remplacer, cette superstructure étant formée d'une seule pièce avec ledit corps (5) ou rapportée sur ce dernier, caractérisé en ce que le corps de base (5) formant tige est formé du centre du corps vers sa périphérie, d'au moins trois couches superposées, une couche interne (1) constituant l'âme dudit corps réalisée en un matériau métallique ou composite, une couche intermédiaire (2), continue ou discontinue, élastiquement deformable, destinée à reconstituer la resilience de la superstructure d'un organe naturel en absorbant les chocs et en répartissant les contraintes fonctionnelles à la surface de l'os et une couche externe (3) métallique formant une enveloppe ostéo- intégrable.1. Intraosseous implant, of the type comprising a basic body (5) generally cylindrical forming a rod, permanently installed in the bone, a replacement assembly (6) intended to reform the superstructure of the organ to be replaced, this superstructure being formed in one piece with said body (5) or attached to the latter, characterized in that the base body (5) forming a rod is formed from the center of the body towards its periphery, of at least three superposed layers , an internal layer (1) constituting the core of said body made of a metallic or composite material, an intermediate layer (2), continuous or discontinuous, elastically deformable, intended to reconstitute the resilience of the superstructure of a natural organ by absorbing the shocks and by distributing the functional stresses on the surface of the bone and an external metallic layer (3) forming an osteo-integrable envelope.
2. Implant intra-osseux selon la revendication 1, caractérisé en ce que la couche interne (1) et la couche externe (3) du corps de base sont reliées entre elles au voisinage de la zone supra-osseuse pour délimiter entre elles un espace fermé plus ou moins rempli par ladite couche intermédiaire (2).2. intraosseous implant according to claim 1, characterized in that the internal layer (1) and the external layer (3) of the base body are interconnected in the vicinity of the suprosseous zone to delimit between them a space closed more or less filled by said intermediate layer (2).
3. Implant intra-osseux selon la revendication 1, caractérisé en ce que la couche interne (1) et la couche externe (3) délimitent entre elles un espace ouvert dont l'ouverture de forme généralement annulaire, est située au- dessus de la zone osseuse.3. Intraosseous implant according to claim 1, characterized in that the internal layer (1) and the external layer (3) delimit between them an open space whose opening of generally annular shape, is located above the bone area.
4. Implant intra-osseux selon l'une des revendications 1 à 3, caractérisé en ce que la couche intermédiaire (2) est composée d'une matière viscoélastique qui remplit au moins partiellement l'espace libre entre la couche interne (1) et la couche externe (3).4. Intraosseous implant according to one of claims 1 to 3, characterized in that the intermediate layer (2) is composed of a viscoelastic material which fills at least partially the free space between the inner layer (1) and the outer layer (3).
5. Implant intra-osseux selon l'une des revendications 1 à 4, caractérisée en ce que la couche intermédiaire (2) est une membrane en caoutchouc ou en élastomère simple ou réticulé.5. Intraosseous implant according to one of claims 1 to 4, characterized in that the intermediate layer (2) is a rubber or simple or crosslinked elastomer membrane.
6. Implant intra-osseux selon l'une des revendications 1 à 5, caractérisé en ce que la couche externe (3) présente au moins à sa surface des ondulations favorisant l'ancrage de l'implant dans l'os (4) et sa déformation.6. intraosseous implant according to one of claims 1 to 5, characterized in that the external layer (3) has at least on its surface undulations favoring the anchoring of the implant in the bone (4) and its deformation.
7. Implant intra-osseux selon l'une des revendications 1 à 6, caractérisé en ce que la couche interne (1) et la couche externe (3) présentent à la surface de leurs faces en regard des moyens d'ancrage de la couche intermédiaire (2).7. intraosseous implant according to one of claims 1 to 6, characterized in that the internal layer (1) and the external layer (3) have on the surface of their faces opposite means for anchoring the layer intermediate (2).
8. Implant intra-osseux selon l'une des revendications 1 à 7, caractérisé en ce que l'épaisseur de la couche intermédiaire (2) est variable pour optimiser la répartition des forces le long de la couche externe (3).8. Intraosseous implant according to one of claims 1 to 7, characterized in that the thickness of the intermediate layer (2) is variable to optimize the distribution of forces along the outer layer (3).
9. Implant intra-osseux selon l'une des revendications 1 à 8, caractérisé en ce que le corps de base (5) formant tige est une tige d'implant fémoral.9. intraosseous implant according to one of claims 1 to 8, characterized in that the base body (5) forming a rod is a femoral implant rod.
10. Implant intra-osseux selon l'une des revendications 1 à 9, caractérisé en ce que le corps de base (5) formant tige est une tige d'implant dentaire.10. Intraosseous implant according to one of claims 1 to 9, characterized in that the base body (5) forming a rod is a dental implant rod.
11. Implant intra-osseux selon l'une des revendications 1 à 10, caractérisé en ce que le corps de base (5) formant tige est une tige de support d'un plateau tibial. 11. intraosseous implant according to one of claims 1 to 10, characterized in that the base body (5) forming a rod is a support rod for a tibial plateau.
PCT/FR1996/000671 1996-05-03 1996-05-03 Intra-bone implant WO1997041809A1 (en)

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CN106983583A (en) * 2017-04-27 2017-07-28 北京爱康宜诚医疗器材有限公司 Bone prosthesis
CN116747051A (en) * 2023-08-22 2023-09-15 北京大学第三医院(北京大学第三临床医学院) Bone implant

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US9901424B2 (en) 2009-11-24 2018-02-27 Zimmer Dental, Inc. Porous implant device with improved core
US10687919B2 (en) 2009-11-24 2020-06-23 Zimmer Dental, Inc. Porous implant device with improved core
CN106983583A (en) * 2017-04-27 2017-07-28 北京爱康宜诚医疗器材有限公司 Bone prosthesis
CN116747051A (en) * 2023-08-22 2023-09-15 北京大学第三医院(北京大学第三临床医学院) Bone implant
CN116747051B (en) * 2023-08-22 2023-11-24 北京大学第三医院(北京大学第三临床医学院) Bone implant

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