Intervertebral disc prosthesis
AssigneeFournitures Hospitalieres Industrie-F.H. Industrie
InventorAlain Aaron
Life of this patent
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Abstract
The invention relates to an intervertebral disc prosthesis comprising two half-shells (7, 10) clasping a compression pad. According to the invention, the central part of one (10) of the two half-shells comprises a shaft (14) which faces the other half-shell (7), while the central part of said second half-shell (7) comprises a stud (13) which faces the first half-shell, said stud having a smaller cross-section than that of the shaft and being inserted therein. The sum of the lengths of the shaft (14) and the stud (13) is greater than the distance between the two half-shells (7, 10), the aforementioned compression pad being disposed between the two half-shells in the space between the shaft and the stud.
Claims20
An intervertebral disc prosthesis comprising:
- two plate-shaped or cup-shaped rigid half-shells, each of the half shells being configured to be fixed to one of two vertebrae adjacent to an intervertebral disc to be replaced, the two rigid half-shells being disposed on respective sides of a compression pad and affixed thereto;
- and
- a first of said two half shells comprising, in a central zone thereof, a hollow shaft oriented toward a second of said two half shells, the second half-shell comprising, in a central zone thereof, a stud oriented toward the first half-shell and penetrating into the hollow shaft, the compression pad including a core portion operatively engaged between and in contact with the hollow shaft and the stud, and an outer ring portion disposed outwardly of the core portion and of the hollow shaft, wherein the outer ring portion comprises a first surface and a second surface opposed to the first surface, the first and second surfaces of the outer ring portion being respectively affixed to inner surfaces of the two half-shells.
An intervertebral disc prosthesis comprising:
- two plate-shaped or cup-shaped rigid half-shells, each of the half shells being configured to be fixed to one of two vertebrae adjacent to an intervertebral disc to be replaced, the two rigid half-shells being disposed on respective sides of a compression pad and affixed thereto;
- and
- a first of said two half shells comprising, in a central zone thereof, a hollow shaft oriented toward a second of said two half shells, the second half-shell comprising, in a central zone thereof, a stud oriented toward the first half-shell and penetrating into the hollow shaft, the compression pad including a core portion operatively engaged between and in contact with the hollow shaft and the stud and an outer ring portion disposed outwardly of the core portion and of the hollow shaft, wherein the outer ring portion comprises a first surface and a second surface opposed to the first surface, the first and second surfaces of the outer ring portion being respectively affixed to inner surfaces of the two half-shells, wherein the core portion of the compression pad comprises a first material and the outer ring portion of the compression pad comprises a second material, the second material being harder than the first material and being a polycarbonate urethane type material.
Dependencies are inferred from the claim text.