Patent ID: 7678149

Claim:
An interbody fusion spacer for engagement within an intervertebral space between adjacent vertebrae, comprising: a spacer body formed of bone and defining a spacer height, a spacer width and a spacer length extending along a longitudinal axis, said spacer body including an insertion end and an opposite tool engagement end each arranged along said longitudinal axis, said insertion end and said opposite tool engagement end each comprising a flattened end surface, said spacer body including upper and lower vertebral engaging surfaces and a sidewall including upper and lower flattened portions that define a reduced height of said sidewall and said opposite ends of said spacer body, said vertebral engaging surfaces including surface features defined along said spacer length and structured to facilitate engagement with the adjacent vertebrae to inhibit movement of said spacer body within the intervertebral space, said spacer body defining a chamber extending therethrough and opening onto said vertebral engaging surfaces; and wherein said surface features comprise teeth, and wherein said chamber interrupts at least some of said teeth extending across said spacer width.