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ENTIRELY CERAMIC ACETABULUM HAVING A POROUS REAR OUTER SURFACE

20170239055 · 2017-08-24

    Inventors

    Cpc classification

    International classification

    Abstract

    The invention relates to an acetabulum (1) for a hip prosthesis, comprising an inner cavity (2) and a rear outer surface (3) facing the bone. In order to be able to implant the acetabulum (1) without using cement, at least some areas of the outer surface (3) are porous and osseointegrative, and the acetabulum (1) is made exclusively of a ceramic material.

    Claims

    1. An acetabulum for a hip joint prosthesis with an inner cavity and a rear outer surface facing the bone, wherein the outer surface is designed to be porous and osseointegrative at least in places, and the acetabulum consists solely of a ceramic material.

    2. A method for producing the porous osseointegrative outer surface of the acetabulum according to claim 1, wherein the acetabulum is produced from a sintered molded article and the porous osseointegrative layer is applied to the outer surface at least in places.

    3. The method according to claim 2, wherein the porous outer surface is produced by application of a ceramic slurry and place-holders (pore-formers) in the green state and burning off the place-holders during sintering.

    4. The method according to claim 2, wherein the porous outer surface is produced by foaming of a ceramic slurry in the green state and subsequent sintering.

    5. The method according to claim 2, wherein the porous outer layer is produced by joining of a dense molded article to a porous ceramic molded body in the sintered state.

    6. The method according to claim 5, wherein the porous molded body is produced by foaming of ceramic slurries and sinters or infiltration of a porous substrate material with slurry and sinters.

    7. The method according to claim 5, wherein the joining is carried out by soldering or gluing.

    8. The method according to claim 2, wherein the porous outer surface is produced by 2c-injection molding (dense phase and porous or pore-forming phase) and sintering.

    9. The method according to claim 2, wherein the porous outer surface acquires additional functionality through further coating, such as higher integration speed or antibacterial effects.

    10. The method according to claim 9, wherein the porous rear face is coated with bioglasses, hydroxylapatite, functionalized proteins, or hydrogels.

    Description

    [0016] FIG. 1 shows an acetabulum 1 with an inner cavity 2 and a rear outer surface 3 facing the bone. According to the invention the outer surface 3 is designed to be porous and osseointegrative at least in places. The acetabulum 1 consists solely of a ceramic or a ceramic material.