ARTIFICIAL JOINT CUP

Abstract

An artificial joint cup (2), in particular a hip joint cup, for implanting in a cavity in a bone. The joint cup (2) is, in particular, substantially in the form of a spherical dome cup, having a convex outer surface (3) and a concave inner surface (4). In addition, the joint cup (2) comprises an outer diameter (OD) and an inner diameter (ID). The ratio of the difference (D) between the outer diameter (OD) and the inner diameter (ID) in relation to the outer diameter (OD) is in a region between 0.5 and 0.07, preferably between 0.3 and 0.075, particularly preferably between 0.2 and 0.1. The joint cup (2) is manufactured from a ceramic material, and the convex outer surface (3) has a micro-structuring.

Claims

1-21. (canceled)

22. An artificial joint cup for implanting in a cavity in a bone having a convex outer surface and a concave inner surface, having an outer diameter and an inner diameter, wherein a ratio of a difference between the outer diameter and the inner diameter, in relation to the outer diameter, lies in a range between 0.5 and 0.07, the joint cup is made of a ceramic material, and the convex outer surface has a macro-structuring.

23. The joint cup as claimed in claim 22, wherein the ratio of the difference between the outer diameter and the inner diameter, in relation to the outer diameter, lies in a range between 0.3 and 0.075.

24. The joint cup as claimed in claim 23, wherein the ratio of the difference between the outer diameter and the inner diameter, in relation to the outer diameter, lies in a range between 0.2 and 0.1.

25. The joint cup as claimed in claim 22, wherein the concave inner surface forms a bearing surface for a joint ball that is to be received in the joint cup.

26. The joint cup as claimed in claim 22, wherein the concave inner surface forms a holding surface for an inner cup that is to be received in the joint cup.

27. The joint cup as claimed in claim 22, wherein the macro-structuring comprises a multiplicity of structure elements which are delimited by depressions and measure from 0.3 mm to 3 mm.

28. The joint cup as claimed in claim 22, wherein the macro-structuring comprises a pore structure with a multiplicity of cavities that measure from 0.03 mm to 3 mm.

29. The joint cup as claimed in claim 22, wherein the macro-structuring is suitable for inward growth of a trabecular structure of a bone.

30. The joint cup as claimed in claim 27, wherein depressions which separate structure elements in one row from each other, are arranged offset relative to each other in relation to depressions which separate structure elements in an adjacent row from each other.

31. The joint cup as claimed in claim 27, wherein depressions which delimit the structure elements are formed by intersecting grooves of mutually opposite pitch.

32. The joint cup as claimed in claim 27, wherein the structure elements are shaped as cubes, pyramids, tetrahedrons, wedges, polyhedrons or have a shape of an acute-angled pitched roof.

33. The joint cup as claimed in claim 27, wherein the depressions form concave surface areas of which the curvature has a radius of curvature of at least 0.1 mm.

34. The joint cup as claimed in claim 22, wherein the ceramic material, from which the joint cup is manufactured, has osteoconductive properties.

35. The joint cup as claimed in claim 33, wherein the ceramic material, from which the joint cup is manufactured, consists of an osteoconductive sintered oxide ceramic.

36. The joint cup as claimed in claim 22, wherein the convex outer surface has an osteoconductive coating.

37. The joint cup as claimed in claim 36, wherein the osteoconductive coating has a micro-structuring.

38. The joint cup as claimed in claim 37, wherein the micro-structuring comprises a pore structure with a multiplicity of cavities that measure from 0.003 mm to 0.3 mm.

39. The joint cup as claimed in claim 36, wherein the osteoconductive coating is additionally osteointegrative.

40. The joint cup as claimed in claim 36, wherein the osteoconductive consists of an osteoconductive metal.

41. The joint cup as claimed in claim 40, wherein the osteoconductive coating consists of platinum or of an element of a second or third transition group.

42. The joint cup as claimed in claim 36, wherein the osteoconductive coating consists of hydroxyapatite or of an osteoconductive sintered oxide ceramic.

43. The joint cup as claimed in claim 36, wherein the ceramic material from which the joint cup is manufactured consists of a sintered oxide ceramic.

44. The joint cup as claimed in claim 36, wherein the ceramic material from which the joint cup is made is selected from the group consisting of titanium carbide ceramic, titanium oxycarbide ceramic, titanium nitride ceramic, titanium carbonitride ceramic, titanium aluminum nitride ceramic, titanium aluminum carbonitride ceramic, titanium zirconium nitride ceramic and silicon nitride ceramic.

Description

[0035] Further advantages and individual features of the invention will become clear from the following description of a number of illustrative embodiments and from the figures, in which:

[0036] FIG. 1 shows a plan view of a joint cup according to the invention;

[0037] FIG. 2 shows a section through a joint cup according to FIG. 1;

[0038] FIG. 3 shows a section through an alternative illustrative embodiment of a joint cup according to the invention;

[0039] FIG. 4 shows a plan view of a joint cup according to the invention with spiral-shaped grooves;

[0040] FIG. 5 shows a side view of a joint cup according to FIG. 4;

[0041] FIG. 6 shows a perspective view of a further embodiment of a joint cup according to the invention;

[0042] FIG. 7 shows a detailed view of the surface profile of a joint cup according to FIG. 6;

[0043] FIG. 8 shows a plan view of a further embodiment of a joint cup according to the invention with spiral-shaped grooves running in opposite directions;

[0044] FIG. 9 shows a side view of a joint cup according to FIG. 8;

[0045] FIG. 10 shows a sectional image through a joint cup according to the invention with coating;

[0046] FIG. 11 shows a sectional drawing through an alternative embodiment of a joint cup according to the invention with coating;

[0047] FIG. 12 shows an enlarged detail of part of a sectional drawing through a joint cup according to FIG. 11.

[0048] FIG. 1 shows a plan view of a one-part joint socket 1 with a joint cup according to the invention. Here, the concave bearing surface 4 at the same time also forms the bearing surface 6 for a joint ball that is to be inserted into the joint socket 1.

[0049] FIG. 2 shows a section through a one-part joint socket 1 with a joint cup 2 according to the invention as per FIG. 1. This joint cup is in the form of a spherical dome cup with a convex outer surface 3 and a concave bearing surface 4. The joint cup has an outer diameter (OD) and an inner diameter (ID).

[0050] FIG. 3 shows a section through a multi-part joint socket 1 with a joint cup 2 according to the invention into which an inner cup 5 is inserted. This inner cup 5 is rigidly connected to the concave inner surface 4 of the joint cup 2 and forms a bearing surface 11 for a joint ball that is to be inserted into the joint socket 1.

[0051] FIGS. 4 and 5 show a plan view and a side view of an illustrative embodiment of a joint cup 2 according to the invention. Here, the macro-structuring on the convex outer surface of the cup comprises a multiplicity of structure elements 7 which are delimited by depressions 8, in this case by spiral-shaped grooves.

[0052] FIG. 6 shows a perspective view of an alternative embodiment of a joint socket 2 according to the invention. The surface profile of said joint socket 2 is shown enlarged in FIG. 7. It will be seen that the depressions 9, which separate the structure elements 7 in one row from each other, are arranged offset relative to each other in relation to depressions 10 which separate structure elements 7 in an adjacent row from each other.

[0053] FIGS. 8 and 9 show a plan view and a side view of a further alternative embodiment of a joint socket 2 according to the invention. The depressions 11, which delimit the structure elements 7, are here formed by intersecting grooves with a mutually opposite pitch.

[0054] FIG. 10 shows a part of a section through a joint socket 2 according to the invention with a smooth convex outer surface 3. The joint cup 2 depicted has the shape of a spherical dome cup. The convex outer surface 3 has an osteoconductive coating 12. By contrast, the concave bearing surface 4 is uncoated.

[0055] FIG. 11 shows a part of a section through a further alternative illustrative embodiment of a joint cup 2 according to the invention. In this case, the joint cup has a macro-structured outer surface 3. This outer surface 3 is provided with an osteoconductive coating 12. By contrast, the concave inner surface 4 on the inside of the spherical dome cup is also uncoated here.

[0056] FIG. 12 shows an enlarged detail of part of a section through a joint cup 2 according to the invention as per FIG. 11. It will be seen that an osteoconductive coating 12, which in turn has pores 13, is located on the structure elements 7 of the macro-structuring. By way of these pores, the surface can form a direct functional and structural union with the bone tissue.