EP3600163A1 - Palier lisse en céramique - Google Patents

Palier lisse en céramique

Info

Publication number
EP3600163A1
EP3600163A1 EP18713211.3A EP18713211A EP3600163A1 EP 3600163 A1 EP3600163 A1 EP 3600163A1 EP 18713211 A EP18713211 A EP 18713211A EP 3600163 A1 EP3600163 A1 EP 3600163A1
Authority
EP
European Patent Office
Prior art keywords
ceramic
sliding
sliding partner
partner
porous
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.)
Ceased
Application number
EP18713211.3A
Other languages
German (de)
English (en)
Inventor
Mateusz Maria JUSZCZYK
Michael Götz
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.)
Ceramtec GmbH
Original Assignee
Ceramtec GmbH
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 Ceramtec GmbH filed Critical Ceramtec GmbH
Publication of EP3600163A1 publication Critical patent/EP3600163A1/fr
Ceased legal-status Critical Current

Links

Classifications

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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/107—Refractories by fusion casting
    • C04B35/109—Refractories by fusion casting containing zirconium oxide or zircon (ZrSiO4)
    • 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
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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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    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
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    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/40—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material
    • A61L27/42—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having an inorganic matrix
    • A61L27/427—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having an inorganic matrix of other specific inorganic materials not covered by A61L27/422 or A61L27/425
    • A—HUMAN NECESSITIES
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    • 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
    • A61L27/56—Porous materials, e.g. foams or sponges
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00269—Ceramics or ceramic-like structures based on metal carbides
    • A61F2310/00281—Ceramics or ceramic-like structures based on metal carbides containing silicon carbide
    • 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
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00299—Ceramics or ceramic-like structures based on metal nitrides
    • A61F2310/00317—Ceramics or ceramic-like structures based on metal nitrides containing silicon nitride
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00836—Uses not provided for elsewhere in C04B2111/00 for medical or dental applications
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
    • C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/08—Solids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2316/00—Apparatus in health or amusement
    • F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances

Definitions

  • the invention relates to the use of a ceramic porous part as sliding partner A in conjunction with a preferably ceramic sliding partner B, which moves against the sliding partner A.
  • the invention preferably relates to the use of the sliding partners in the field of medical technology.
  • Sintered bearings are known in the prior art as a form of plain bearings in which the bearing shell is made of a sintered, porous metal.
  • the pores are filled with lubricants, such. For example oils. Due to the porosity can be large quantities
  • bearings made of sintered metals thus represent at least partially self-lubricating bearings.
  • As sintered metals z.
  • the porous material of the sliding bearing ensures uniformity
  • JP2008150233 discloses a porous sliding partner made of a ceramic material, into the pores of which a lubricating agent or lubricant can be introduced.
  • the ceramic material consists of zirconium oxide.
  • Durazo-Cardenas et al. show a hydrostatic slide bearing made of a ceramic material prepared by the Starch consolidation (SC) process .
  • SC Starch consolidation
  • alumina powder is mixed with starch granules and water and poured into the mold.
  • the starch swells under water absorption and the mass is thus solidified.
  • the starch grains burn and leave pores in the ceramic.
  • a higher static stiffness and a higher torsional rigidity could be achieved.
  • the hydrostatic pressure is better distributed and hydrodynamic effects can be improved.
  • porous structures In general, a variety of methods and methods for making the porous structures are known. These include, for example, slip-based processes in which ceramic porous structures are produced on components or entire porous components by means of a ceramic slurry having organic, structure-determining porosity agents or chemical ingredients.
  • the ceramic slip are called suspensions that a liquid medium, a ceramic starting powder and optionally additional additives.
  • the prior art plain bearings having a hard-hard mating have excellent abrasion resistance and abrasion resistance.
  • noise is generated when the geometry of the journal bearing together with the modulus of elasticity generates and amplifies audible frequencies.
  • the object of the present invention was therefore the provision of ceramic plain bearings of at least two sliding partners, which do not have the disadvantages of the prior art and significantly reduces noise, preferably completely
  • the invention is achieved by the sliding partner A according to claim 1.
  • the sliding partner A is at least partially, preferably completely made of a ceramic foam and has at least one sliding surface, which is at least partially formed from the foamed ceramic. against this sliding surface, a sliding partner B is to move.
  • Preferred embodiments are specified in the subclaims.
  • the sliding bearing consists of a sliding partner B, which moves against the porous sliding partner A and the sliding partner A. Both sliding partners are made in one embodiment of ceramic.
  • the sliding partner B is made of a solid ceramic.
  • the sliding partner B is also at least partially porous, preferably also at least partially made of a ceramic foam.
  • Foamed ceramic parts for the purposes of the present invention are parts made of ceramic, which consist in part, preferably completely made of a ceramic foam.
  • the ceramic foam is made of solid ceramic material which has a significant fraction of pores (usually 20 to 95% by volume) which are isolated
  • ceramic refers to inorganic, nonmetallic sintered materials.
  • the ceramic is preferably selected from sintered metal oxides, carbides or nitrides.
  • Porous means a foamy or spongy, porous material that is pitted, in which pores may contain air. Porous substances are heterogeneous due to the air / liquid contained in the pores. Permeabl refers to a substance permeable to certain substances.
  • the plain bearing consists of at least two parts, the sliding partners A and B, which are arranged to be movable relative to each other.
  • one of the two sliding partners for example, the sliding partner A stationary and the sliding B can be arranged movably to the sliding partner A.
  • the sliding partner B stationary and the sliding partner A are arranged to be movable. In a particular embodiment, both are
  • the sliding partner B is at least partially made of a polished, ceramic material, preferably it is at least partially made solid, so that its sliding surface solid, d. H. with a proportion of ⁇ 10% pores, preferably ⁇ 5% pores, more preferably without pores, with respect to the total area, is formed, particularly preferably, the sliding partner is fully solid.
  • the sliding partner A is at least partially made of a ceramic foam. Its sliding surface is at least partially disposed in the region consisting of the foamed ceramic. It thus has at least one sliding surface, which consists of a ceramic foam and has a porous surface.
  • Full foam part a part which consists of 100% of the volume of ceramic foam. It can be used in medical technology, for example, as a sliding shell, which is in operative connection with a spherical sliding partner B, preferably made of ceramic, with the property as a guide structure for osteoconduction and the
  • Ceramic foam serves as the basis for the sliding surface on which the sliding partner B moves. For refining this sliding surface can also be edited.
  • the sliding surface is made of ceramic foam.
  • 3 D-Structured Part A part that consists of both a porous area and a significant dense ceramic area.
  • the porous area usually protrudes more than 1 mm into the part.
  • Examples include implants for partial resurfacing, in which the area of the part facing the bone is expansively porous and an area of the part comprises a dense ceramic area.
  • 2D-Textured.it Part A part whose surface is partially or completely defined by a thin, near-surface, porous area in its topology. The porous area protrudes about ⁇ 1 mm deep into the part, so that the volume fraction of the dense ceramic is greater than in the 3D-structured part. Examples of this are ceramic
  • Monoblock pans in which the pelvis facing the back is open-pored, textured and the hip joint ball side facing at least partially made of the porous ceramic material and optionally partially made of dense, polished material preferably ceramic is formed.
  • parts whose cross sections are formed from different structures are possible.
  • These structures may include both porous ceramic foam, as well as dense ceramics, wherein the arrangement of the structures through the
  • the ceramic sliding bearing whose sliding partner A has a sliding surface which consists at least partially of a ceramic foam, ceramic implants, d. H. both human and veterinary implants for pets, pets and pets, more preferably implants for
  • implants which usually have wall thicknesses in the range of 0.3 to 30 mm
  • implants for human medical applications are implants for small and large joints, implants in the field of partial resurfacing, as well as components or parts of implant systems.
  • Implants for small joints may in particular comprise implants for the finger joints, toe joints, elbow joints, hocks and the wrist and other joints.
  • the term includes implants for large joints
  • implants for the hip joint, the knee joint and the shoulder joint are implants for the hip joint, the knee joint and the shoulder joint.
  • partial resurfacing within the meaning of the present invention fall
  • Partial dentures that only compensate for local joint / cartilage defects. Usually these consist of a tribologically optimized, congruent side, which faces the joint space, as well as a side facing the bone, which ensures the anchoring. Partial resurfacing is mainly used for large joints, since less (bone) tissue has to be removed due to the small overall surgical area and, as a result, later revision surgery is significantly facilitated. Ceramic parts of structures according to the invention can also be used as components in implant systems. In this case, the porous area, when it is used facing the bone, favor osseointegration.
  • the sliding bearing is used as a technical sliding bearing in a joint, linear, radial, axial and / or Radiaxlager. Because of his
  • a lubricant also called lubricant, solid lubricant and / or
  • Lubricants are selected in one embodiment from liquids, preferably oils or water or mixtures thereof. In a further embodiment, the
  • Lubricant selected from solid lubricant, preferably, graphite, MoS2, hexagonal boron nitride.
  • the lubricants are selected from suspensions, preferably copper or MoS2 in oils. The lubricants lower the
  • Friction coefficient of the plain bearing The lubricants in the form of liquids or suspensions of liquids and solids can be refilled during articulation.
  • sliding bearing materials are used instead of a lubricant or in addition to the lubricant.
  • the sliding bearing materials provide lubrication in the case of dry running and therefore have the same function as the lubricant.
  • the sliding bearing materials are preferably selected from polytetrafluoroethane (PTFE), polyethylene (PE), polyvinyl chloride (PVC), bronze, brass or aluminum alloys.
  • PTFE polytetrafluoroethane
  • PE polyethylene
  • PVC polyvinyl chloride
  • bronze bronze
  • brass or aluminum alloys The sliding bearing materials are self-lubricating solids that are not refilled.
  • the plastics, such as PE and PVC are applied in a preferred embodiment by plastic infiltration on the articulation surface.
  • the lubricant or the sliding bearing materials are brought in an embodiment prior to assembly in the bearing gap and / or in the, preferably open, porosity.
  • the lubricant is supplied during operation, i. preferably conveys pressure and / or capillary forces from outside to inside.
  • the lubricant is supplied in another embodiment by hydrodynamic pressure and / or distributed.
  • the lubricant corresponds to the surrounding medium, such as oil, water and / or body fluids, such as in the case of
  • the connection to other non-ceramic materials or materials is also possible or improved.
  • This makes it possible to bond structures of the invention, for example, by plastic infiltration or bonding to other materials. It can ceramic and non-ceramic structures are connected, wherein a solid preferably permanent connection with the non-ceramic material is possible through the porous portion of the ceramic structure.
  • This can be a cohesive connection of two parts. This cohesive connection can be generated exclusively by a thermal process. It can also be produced by an additional material such as an adhesive. It is also possible to connect two parts by a combination of thermal process and additional material.
  • the macrostructure of the porous region of the sliding partner A is dominated by the pores, the pore size of the porous region of the part being at least 1 nm, preferably 10 ⁇ m, particularly preferably 50 ⁇ m and particularly preferably 100 ⁇ m.
  • the maximum size of the pores is 1 mm, preferably 700 ⁇ .
  • the pore sizes are determined by means of microscope images with a resolution of at least 0.2 pixels / ⁇ and preferably with a resolution in the range of 0.2 to 1 pixel / ⁇ by software-based marking and then calculating the equivalent diameter. By suitable choice of pore size, the biological, in particular the osseointegrative properties can be significantly improved.
  • the pores are spherical and / or elongated and / or irregularly shaped.
  • the pores are monomodal in a further embodiment multimodal.
  • the pores are distributed homogeneously over the entire sliding partner.
  • the pores are graded and / or hierarchically distributed, i. there are local or over the entire part extending gradients.
  • the porous region furthermore preferably has a porosity of 20 to 95%, preferably 55 to 85%.
  • the optional existing dense or massive area has a residual porosity of max. 10%, preferably at most 5%, particularly preferably no residual porosity, on.
  • the porosity is preferably present as predominantly open porosity, which forms an interconnecting pore network, wherein at least 60%, particularly preferably at least 85% of the porosity represent open porosities. Due to the interconnecting pore network with the above-mentioned pore sizes, the course of osseointegration is made possible even beyond the near-surface, cut pores into deeper pores.
  • the ingrowth can be up to depths of more than 0.5 mm up to 5 mm. At the same time, the deeper ingrowth can produce a mechanical Gearing of implant and surrounding tissue or bone can be achieved by undercut pores.
  • the open porosity allows a nutrient supply through
  • the modulus of elasticity of the ceramic foam is approximately ⁇ 15%, preferably ⁇ 10%, of the modulus of elasticity of the ceramic solid material.
  • the ceramic material for the sliding partner A according to the invention and / or the sliding bearing can be made of known and commercially available (ceramic) materials.
  • ceramic plain bearing As an implant, the choice of materials of both sliding partners on the assumption that the ceramic material is biocompatible and preferably higher strengths, a lower corrosion behavior and lower ion release rates in the body than calcium phosphates such.
  • the optionally present at least two regions of the ceramic part may consist of the same or a different ceramic material.
  • Preferred ceramic materials including the starting powders for producing the inventive sliding partner A and / or B, are oxide-ceramic materials, for example based on aluminum oxide or zirconium oxide, or non-oxide ceramic materials, based for example on silicon nitride or silicon carbide.
  • oxide-ceramic materials for example based on aluminum oxide or zirconium oxide
  • non-oxide ceramic materials based for example on silicon nitride or silicon carbide.
  • the basic requirement for the material when used as an implant is its biocompatibility, ie it must not cause negative reactions in the body. In the specific case is for the product the biological assessment z. B. according to DIN EN ISO 10993 (as of 2010-04) to meet.
  • the ceramic material is a material of the mixed oxide system Al 2 O 3 -ZrO 2, in particular ZTA ceramics (Zirconia Toughned Alumina), or ceramic composites in which zirconium oxide represents the volume-dominating phase, these systems still having chemical properties depending on the dominating phase
  • Stabilizers or dispersoids are added in the form of other metal oxides or mixed oxides.
  • alumina is the volume dominating phase.
  • a ceramic material consisting of 60 to 98% by volume of an aluminum oxide / chromium oxide mixed crystal as matrix material containing 0.8 to 32.9% by volume of one or more further mixed crystals selected from mixed crystals according to one of the general formulas LaO, 9AI1 1, 76-xCrx019, Me1AI1 1 -xCrx017, Me2AI12-xCrx019,
  • Zirconia consists of more than 10 to 15 mol.% Of one or more of the oxides of cerium, praseodymium and terbium and / or 0.2 to 3.5 mol.% Of yttrium oxide as stabilizing oxides, based on the mixture of zirconium dioxide and stabilizing oxides may contain.
  • dispersed zirconium oxide and optionally further additives or phases wherein the alumina content is at least 65% by volume and the zirconium oxide content is from 10 to 35% by volume, the zirconium oxide, based on the total zirconium oxide content, being from 80 to 99%, preferably from 90 to 99 %, in the tetragonal phase and wherein the stabilization of the tetragonal phase of the zirconium oxide is predominantly not chemically but mechanically, the total content of chemical
  • Stabilizers ⁇ 0.2 mol%, preferably no chemical stabilizers are used.
  • This material preferably contains a further dispersoid phase, the volume fraction of the dispersoids forming the dispersoid phase being up to 10% by volume, preferably 2 to 8% by volume, particularly preferably 3 to 6% by volume.
  • dispersoids according to the invention basically all substances can be used which are chemically stable and during the preparation of the
  • dispersoids suitable according to the invention are strontium aluminate (SrAl12019) or lanthanum aluminate (LaAl1 1018).
  • Ceramic composites in which zirconium oxide is the volume dominating phase is a ceramic material, zirconia ceramic matrix and at least one secondary phase dispersed therein, the zirconia matrix occupying at least 51% by volume of the composite and the Secondary phase represents a proportion of 1 to 49 vol .-% of the composite material, wherein the zirconium oxide, based on the total zirconium oxide content of 90 to 99%, preferably 95 to 99% in the tetragonal phase is present, and wherein as chemical stabilizers Y203, Ce02, Gd203, Sm203 and / or Er203 are included, wherein the total content of chemical stabilizers ⁇ 12 mol% based on the Zirkonoxidgehalt and wherein the secondary phase is selected from one or more of the following compounds: Strontiumhexaaluminataluminat
  • the mean particle size (D50) of the ceramic starting powder can be determined by
  • Laser diffraction can be determined and is according to the invention preferably in the range of 0.01 to 50 ⁇ , more preferably in the range of 0.1 to 5 ⁇ .
  • the grain size in the sintered microstructure in a similar range of 0.01 to 50 ⁇ or particularly preferably in the range 0.1 to 5 ⁇ , in the structure determined by means of line-cut method according to DIN EN ISO 13383-1 (2016-1 1).
  • the ceramic part according to the invention consists in one embodiment at least of a porous region and optionally a dense region, wherein the porous region consisting of a ceramic foam, preferably a density in the range of 0.5 to 2.5 g / cm 3 , especially preferably 0.8 to 1, 8 g / cm 3 .
  • the strength of the porous portion of the member is preferably in the range of 5 to 300 MPa, more preferably in the range of 20 to 150 MPa.
  • the thermal conductivity of the ceramic part is preferably ⁇ 10 W / Km and thus lies in a similar range as the thermal conductivity of the natural tissue. As a result, an altered cold / hot sensation is reduced by the use of an implant for the user or patient, preferably completely prevented.
  • This material behavior of a part of the invention allows machining methods z. Drilling, nailing, screwing, rasping, cutting. This makes it possible to fix a part according to the invention by means of fastening means such as screws, nails, pins, etc. These fasteners can be in the area passing through the porous
  • Ceramic foam is formed, are introduced without the part undergoes damage that affects the use. This has the consequence that the part of the invention when used as an implant, in particular the porous area of the ceramic foam, promotes not only the ingrowth of the natural tissue, but also before and during the operation for
  • Fixation contributes, d. H. a connection with the body or other implant material is possible.
  • the ceramic part of the present invention or its porous region is preferably screwable, d. H. screws can be inserted, nailable, d. H. the hammering or pressing of nails is made possible and drivable, d. H. it can be introduced holes, whereby more positive and / or non-positive connections (eg., By pins), and sewing are possible.
  • the mentioned fixing means may have a diameter of up to 5 mm, preferably up to 3 mm.
  • the ceramic part or its porous area, which does not include the sliding surface. are also adhesive and can be welded (Bone Welding®).
  • the porosity of the part according to the invention or of its porous region is advantageous, since the implant can be infiltrated with the process material (> 0.5 mm deep) and then mechanically beyond a chemical bond For example, it is toothed connected to this. As a result, too
  • connections to other materials such as non-ceramic materials such as plastics and metals possible.
  • the different joining methods of the different ones Materials may be performed within applications, such as during use during operation or detached therefrom, beforehand in fabricating a component or part of a system.
  • the ceramic-specific wetting behavior is improved because the pores lead to a rough surface.
  • the porous sliding partner has a lower rigidity due to the porosity. This can be done a mechanical damping.
  • the plain bearing has a lower density and is therefore suitable for use in lightweight applications
  • the permeable, (open) pore structure reduces the adhesion force between both sliding partners.
  • the bearings Due to the porosity, the bearings have the ability, with and without

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  • Animal Behavior & Ethology (AREA)
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  • Transplantation (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Orthopedic Medicine & Surgery (AREA)
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  • Prostheses (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

L'invention concerne un élément associé de glissement en céramique pour un palier lisse qui se compose au moins partiellement, de préférence entièrement, d'une mousse en céramique. L'élément associé de glissement en céramique comprend au moins une surface de glissement sur laquelle peut se déplacer un élément associé de glissement, la surface de glissement se composant au moins partiellement, de préférence entièrement, d'une mousse en céramique.
EP18713211.3A 2017-03-28 2018-03-22 Palier lisse en céramique Ceased EP3600163A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017205173 2017-03-28
PCT/EP2018/057327 WO2018177890A1 (fr) 2017-03-28 2018-03-22 Palier lisse en céramique

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EP3600163A1 true EP3600163A1 (fr) 2020-02-05

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EP18713211.3A Ceased EP3600163A1 (fr) 2017-03-28 2018-03-22 Palier lisse en céramique

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US (1) US20200061238A1 (fr)
EP (1) EP3600163A1 (fr)
CN (1) CN110461276B (fr)
WO (1) WO2018177890A1 (fr)

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