| 摘要 |
PROBLEM TO BE SOLVED: To provide an elongate prosthetic spinal disc nucleus to be implanted deeply in a nucleus cavity in a spinal disc space of a human body. SOLUTION: A prosthetic spinal disc nucleus 20 to be implanted in the nucleus cavity of the spinal disc made with a pair of vertebral bodies forming end plates facing each other and an endless annular band comprises: an almost inelastic restricted jacket 24 which has roughly fixed circumference and length, a roughly fixed maximum capacity less than the volume of the nucleus cavity, and a height corresponding to a plain almost orthogonal to the end plates facing each other, and retains an initial buried volume presenting a rough elliptic cross-section due to the end plates facing each other during transplantation; and an amorphous polymer core 22 inserted in the restricted jacket in a fluid state. COPYRIGHT: (C)2008,JPO&INPIT
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