| 摘要 |
An artificial disc having a pair of opposing plates (100b) for seating against opposing vertebral bone surfaces, separated by a wave washer (200a) having a circumferential extent surrounding a central bore. Various wave washer embodiments disclosed include circumferential extents that are ring-shaped, spiral-shaped, straight, bowed, grooved, wavy, thinning, thickening, and slotted. Various central bores disclosed include simple bores and bores that form a curved socket. Various plate embodiments disclosed includeplates having, on inwardly facing surfaces, a flat surface, a circular recess, a ball-shaped protuberance that is mateable with the curvate socket. The wave washers (200a) are disposable between the plates (100b), through various disclosed coupling, so that t he plates (100b) compress, rotate and angulate freely relative to one another, enabling the artificial disc to mimic a healthy natural intervertebral disc.
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