Intervertebral disc prosthesis
US6682562B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2003 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Jan 10, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00029
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention concerns an intervertebral disc prosthesis comprising an upper plate (2) and a lower plate (3) anchored respectively on the upper end-plate and the lower end-plate of the vertebral bodies of the vertebrae lying above and below a spine, a central core (4) placed between the two plates (2, 3) which have an upper spherical cap (13) and a lower spherical cap (14) co-operating respectively with the spherical impressions (9) arranged in said upper and lower plates, and an annular element (5) made of viscoelastic material which is centred about the core (4) and is urged into contact with protuberances (12) provided on each internal surface (8) of the upper plate (2) and of the lower plate (3) so as to limit and control the bending, inclining and rotating movements of the upper plate (2) and of the lower plate (3) relative to each other and about the core (4), and ensure the positioning stability of the core (4) between the two plates (2, 3) and prevent fibrous deposits from penetrating inside the prosthesis (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.