Total hip prosthetic apparatus made of non-porous alumina

Claim 2

A PROSTHETIC APPARATUS DESIGNED TO REPLACE A NATURAL ARTICULATION BETWEEN TWO BONES, COMPRISING A FIRST HEMISPHERICAL PIECE CONSISTING OF NON-POROUS ALUMINA TO BE ATTACHED TO A FIRST BONE BY REOSSIFICATION, A SECOND ELONGATED PIECE TO BE ATTACHED TO A SECOND BONE, COOPERATING SURFACES ON SAID FIRST AND SECOND PIECES BEING FORMED FROM NON-POROUS SMOOTHED AND GROUND ALUMINA, THE SECOND PIECE CONSISTING OF TWO PORTIONS, ONE PORTION OF WHICH IS A METALIC ROD AND THE OTHER PORTION OF WHICH IS A HEAD CONSISTING OF NON-POROUS ALUMINA SECURED TO THE METALLIC ROD, SAID HEAD PROVIDING THE COOPERATING SURFACE OF SAID SECOND PIECE, THE OUTER CONVEX PORTION OF SAID HEMISPHERICAL FIRST PIECE WHICH IS TO COME INTO CONTACT WITH AN OSSEOUS PART OF THE BONE TO WHICH IT MUST BE SECURED BY REOSSIFICATION INCLUDING A PLURALITY OF ANFRACTUOSITIES OF A SIZE SUFFICIENT TO PERMIT INGROWTH OF OSSEOUS CELLS, AND MEANS FOR ANCHORING SAID FIRST PIECE TO SAID FIRST BONE INCLUDING A FIRST ANCHORING PROJECTION EXTENDING FROM SAID OUTER CONVEX POR-

Claim 3

A total prosthetic apparatus of the hip according to claim 1, characterized in that the first and second anchoring projections are provided with anfractuosities analogous to those of the convex face of said first piece.

Claim 4

A total prosthetic apparatus of the hip according to claim 1, wherein at least two dimensions of said anfractuosities are in the order of a millimeter.

Claim 5

A total prosthetic apparatus of the hip, comprising a first hemispherical piece consisting of non-porous alumina to be attached to the hip bone by reossification, a second elongated piece to be attached to the femur, cooperating surfaces on said first and second pieces being formed from non-porous smoothed and ground alumina, the second piece comprising two portions, one portion of which is a metallic rod and the other portion of which is a spherical head consisting of non-porous alumina secured to the metallic rod, said spherical head providing the cooperating surface of said second piece, the outer convex portion of said hemispherical first piece which is to come into contact with the osseous part of the hip bone to which it must be secured by reossification including a plurality of anfractuosities of a size sufficient to permit ingrowth of osseous cells, a first anchoring portion extending from the top of said hemispherical first piece and coaxial therewith, and at least another anchoring portion extending also from said other convex portion and having an axis parallel to the axis of symmetry of the first piece, and adapted to be fitted into an area of the hip bone which is thicker than the area through which the axis of symmetry of the first piece extends.

Claim 6

A total prosthetic apparatus of the hip, comprising a first hemispherical piece consisting of non-porous alumina to be attached to the hip bone by reossification, a second elongated piece to be attached to the femur, cooperating surfaces on said first and second pieces being formed from non-porous smoothed and ground alumina, the second piece comprising two portions, one portion of which is a metallic rod and the other portion of which is a spherical head consisting of non-porous alumina secured to the metallic rod, said spherical head providing the cooperating surface of said second piece, the outer convex portion of said hemispherical first piece which is to come into contact with the osseous part of the hip bone to which it must be secured by reossification including a plurality of anfractuosities of a size sufficient to permit ingrowth of osseous cells, a first anchoring portion extending from the top of said hemispherical first piece and coaxial therewith, and at least another anchoring portion extending also from said other convex portion and having an axis parallel to the axis of symmetry of the first piece, and adapted to be fitted into an area of the hip bone which is thicker than the area through which the axis of symmetry of the first piece extends.

Claim 7

A total prosthetic apparatus of the hip according to claim 4, wherein the anchoring projections are provided with anfractuosities analogous to those of the convex face of said first piece.

Claim 8

A tOtal prosthetic apparatus of the hip according to claim 4, wherein at least two dimensions of said anfractuosities are in the order of a millimeter.