| 摘要 |
The spacer, designed to be inserted between two adjacent vertebrae to re-establish anatomically the correct gap between them, consists of at least one element (2,3) formed from a rigid or slightly resilient vertical wall (4,5) open at the top and bottom to allow it to be filled with bone tissue, and shaped so that it can be inserted between two vertebrae without major mechanical intervention. The upper and lower edges (6,7) of the spacer elements have points (8) or are roughened to ensure that they anchor into the bones of the vertebrae, and their walls are shaped to make the elements broader and deeper at the front than at the back. The spacer elements are made in one piece by machining or moulding e.g. from a titanium alloy with or without a coating, a polymer or other biocompatible radio-transparent material or a polymer with micro-elasticity which promotes bone fusion.
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