ヒトつい間板と等価な静的剛性値を持つ人工つい間板の構造検討

抄録

The human intervertebral disc is an essential element in sustaining weight and in permitting mobility of the spine, which is often subject to degeneration, injuries and disease. In this paper, a new artificial intervertebral disc is proposed to reconstruct the stability and the mobility of a human functional spinal unit. The geometry and the structure of the artificial intervertebral disc were designed by the computer simulation at 3D-FEM, as the static compressive and the torsional stiffnesses of this model agree with the stiffnesses of cadaveric lumbar discs. Consequently, the proposed model consists of two bioactive ceramic plates and intervenient substructure made from rubber-like materials. Glass-ceramics containing apatite and wollastonite was chosen as a material for the plates which come into contact with the bone, because this material is able to form a strong chemical bond with the osseous tissue. Elastic materials of medical grade in the substructure between two plates were selected, as the artificial disc has the same static stiffness properties with a cadaveric lumbar disc.