Claims
- 1. An acetabular cup for receiving a substantially spherical hip joint prosthesis head having an outer surface, the cup comprising:
(a) a ceramic component having a socket surface shaped to rotatably receive the outer surface of the head, and (b) a metal backing in which the ceramic component is received, wherein the ceramic component comprises zirconia-toughened alumina, and wherein the ceramic component is interference fit within the metal backing.
- 2. The cup of claim 1, wherein the zirconia-toughened alumina comprises at least 20 mol% zirconia.
- 3. The cup of claim 1, wherein the zirconia-toughened alumina comprises between 5 vol% and 95 vol% zirconia.
- 4. The cup of claim 1, wherein the zirconia-toughened alumina comprises between 18.2 vol% and 29.5 vol% zirconia, and 100% of the zirconia is in the tetragonal phase.
- 5. The cup of claim 1, wherein the zirconia-toughened alumina further comprises a stabilizing agent .
Parent Case Info
[0001] The present application is a continuation-in-part of Ser. No. 09/552,470, filed Apr. 18, 2000, which is a divisional of U.S. Ser. No. 09/248,792, filed Feb. 12, 1999, which is a divisional of U.S. Ser. No. 08/698,635, filed Aug. 16, 1996, now U.S. Pat. No. 5,871,547, which is a continuation-in-part of U.S. Ser. No. 08/609,711, filed Mar. 1, 1996, now abandoned, which are hereby incorporated by reference in their entirety.
Divisions (2)
|
Number |
Date |
Country |
Parent |
09248792 |
Feb 1999 |
US |
Child |
09552470 |
Apr 2000 |
US |
Parent |
08698635 |
Aug 1996 |
US |
Child |
09248792 |
Feb 1999 |
US |
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
09552470 |
Apr 2000 |
US |
Child |
09944808 |
Aug 2001 |
US |
Parent |
08609711 |
Mar 1996 |
US |
Child |
08698635 |
Aug 1996 |
US |