Motion preserving spinal disk prosthesis implanted into intervertebral space between vertebral bodies of human spinal column, has foam core with pores, whose pore size from center of core is decreased continuously toward edges of core

摘要

The prosthesis (1) has a foam core for surrounding a flexible jacket (3). The foam core is made of open-pore foam. Free volumes of the foam core is filled with clean-viscous liquid i.e. sodium chloride solution, or non-viscous liquid. The foam core is provided with pores of different sizes. The pore size from the center of the foam core is decreased continuously toward edges of the foam core. A base material is made of polyurethane or polycarbonate urethane. The non-viscous liquid is provided with shear rate-dependant properties.