Hip joint prosthesis having a 22.22 mm zirconia femoral head and a 12/14 size stem
US5972033A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Aug 28, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00239
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention relates to a ceramic hip joint prosthesis head for use with a trunnion, the trunnion having a frustoconical end comprising a first section having a diameter of about 12 mm which expands inward at a total angle of about 6 degrees to form a second section having a diameter of about 14 mm, wherein each head comprises: PA1 a) a substantially spherical outer diameter of about 22.22 mm, PA1 b) a centerpoint, and PA1 c) a recess which forms a taper wall extending inward from the outer diameter of the head, wherein the taper wall has a shape suitable for taper fitting upon the frustoconical end of the trunnion to produce contact between the taper wall and the first section of the frustoconical end of the trunnion, a perimeter being defined by the deepest contact between the taper wall and the first section of the frustoconical end of the trunnion, the perimeter having a centerpoint,and wherein each head, when taper fit upon the frustoconical end of the trunnion, has a rupture load of at least 46 kN and is characterized by a distance D between a) the centerpoint of the head and b) the centerpoint of the perimeter defined by the deepest contact between the taper wall and the fi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.