INTERESTTEBRAL PROTESTIC DISC NUCLEO WITH A SHAPE-SHAPED FEATURE.

摘要

A prosthetic intervertebral disc nucleus (20, 70, 100, 130) for implantation in the nucleus cavity of an intervertebral disc, the nucleus cavity having a height defined by a pair of opposite vertebrae and an outer periphery defined by a ring , comprising the prosthetic intervertebral disc nucleus: a shaped hydrogel core (22, 72, 102, 132), shaped so that in a dehydrated state it has a dehydrated form and shaped so that in a hydrated state it has a hydrated form, facilitating the dehydrated form the introduction of the prosthetic intervertebral disc nucleus through a ring opening, whose hydrogel soul increases in volume and passes from the dehydrated form to the hydrated form when it expands from the dehydrated state to the hydrated state; and a constriction envelope (24, 74, 104, 134) surrounding the hydrogel core, the constriction envelope being flexible but substantially inelastic; characterized in that said dehydrated form of the hydrogel soul is generally different from said hydrated form, said hydrated form being a stylized form.