This creation provides a kind of interverbebral disc substitution device, including a upper plate, a lower plate and a liner. Upper plate sets tooling hole, and top sets the first cambered surface and engaging tooth, recessed second cambered surface in bottom, third cambered surface and Ka Gou. Lower plate sets tooling hole, and top sets card slot, and card slot two sides set trip, and bottom sets engaging tooth. Liner top sets the 4th cambered surface, and bottom sets shaft member. When combination, liner is set between what upper plate and lower plate, and upper plate is made to make sliding contact at the top of liner, and liner shaft member can cooperate in what lower plate card slot, fixes liner on what lower plate. It is chronically implanted Hou, causes height to reduce because friction law is gradually worn out, contacts board ditch with lower plate trip and fix, device devitalization function is converted into the intervertebral cages of fixed height, and height is avoided further to decline and lead to other complication.本創作提供一種椎間盤取代裝置，包括一上板、一下板及一襯墊。上板設工具孔，頂部設第一弧面及卡合齒，底部凹設第二弧面、第三弧面與卡溝。下板設工具孔，頂部設卡槽，卡槽兩側設卡榫，底部設卡合齒。襯墊頂部設第四弧面，底部設軸件。組合時，襯墊置於上板與下板間，使上板在襯墊頂部作滑動接觸，襯墊軸件可配合於下板卡槽內，使襯墊卡固於下板之上。長期植入後，因摩擦關係逐漸磨損而造成高度減少，使上板卡溝與下板卡榫接觸而卡固，裝置喪失活動功能，轉換成固定高度之椎間支架，避免高度進一步下降而導致其他併發症。
