Annular ceramic insert for endoprosthetics

Abstract

The invention relates to a ceramic insert (1) for sliding pairs in endoprosthetics. Said insert (1) has an outer face and an inner face; on the inner face, a hemispherical sliding area (2) is formed for accommodating a spherical sliding partner. In order to be able to reduce the thickness of the metal shell plus the insert such that the pelvic bone does not have to be milled as deep down, according to the invention, the insert (1) is designed as a ring or in an annular form.

Claims

1. A ceramic insert for sliding pairs in endoprosthetics, wherein the insert has an outer face and an inner face, and a hemispherical sliding area is formed on the inner face for accommodating a spherical sliding partner, wherein the insert is designed as a ring or in an annular form.

2. The insert according to claim 1, wherein insert has a width (B) of 5 to 20 mm.

3. The insert according to claim 1, wherein the inner face transitions via radii into the outer face.

4. The insert according to claim 1, wherein the hemispherical sliding area covers the entire inner face.

5. The insert according to claim 1, wherein arranged on the outer face, at least in sub-areas, is a clamping surface that is embodied conically or cylindrically.

6. An application of an insert according to claim 1 in hip, shoulder, toe, or knee endoprosthetics.

7. A hip endoprosthetic comprising the ceramic insert according to claim 1.

8. A shoulder endoprosthetic comprising the ceramic insert according to claim 1.

9. A toe endoprosthetic comprising the ceramic insert according to claim 1.

10. A knee endoprosthetic comprising the ceramic insert according to claim 1.

Description

[0019] Advantageous embodiments of the inventive ceramic insert are described in the figures.

[0020] FIGS. 1a and 1b depict an inventive annular ceramic insert 1. FIG. 1a illustrates this insert 1 in one view and FIG. 1b illustrates it in section along the line A-A according to FIG. 1a. The insert 1 has an inner annular segment of a sphere, also called a hemispherical sliding area 2. In a hip prosthesis, the prosthetic head articulates thereon (see FIG. 2). Arranged on the outer face of the insert is a circumferential clamping surface 3 with which the insert may be anchored in a metal shell 4. The width of the insert B is between 5 and 20 mm. R identifies the axis of rotation. An annular embodiment results in an insert that deviates from the rotational symmetry in sub-areas.

[0021] FIG. 2 illustrates the insert 1 according to the invention inserted into a metal shell 4. A prosthesis head 5 has been inserted into the insert 1.

[0022] FIG. 3 is a sectional depiction of an insert 1 according to the invention inserted into a metal shell 4 and having an inner annular segment of a sphere or hemispherical sliding area 2. Reference number 3 identifies a preferably circumferential clamping surface. There may also be interruptions in the clamping surface.

[0023] A ring in this application shall be construed to be a body that is formed from one surface F (see FIG. 1b) that rotates around an axis of rotation R. The width B or the ring shall be construed to mean its extension along the axis of rotation R. Annular shall be construed to mean a ring that is embodied deviating from rotational symmetry in sub-areas.