Artificial spinal disc
US4759769A · kind A · utility
1,086Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1987 |
| Grant date | Jul 26, 1988 |
| Priority date | — |
| Expiry date | Jun 22, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2220/0075
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An artificial disc for a human spine. The disc has upper and lower members hinged together at their rear portions and biased apart at their fronts by stiff coil springs. Rear stop surfaces limit the opening movement of the members. Vertically projecting tabs at the front and side of each member are rigidly screwed to the adjacent vertebrae. Tolerances in the hinge allow limited side to side rocking. The disc and screws are made of titanium alloy or cobalt chrome alloy. In a modified version a hinge pin is replaced by cables tying the members together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.