Patent ID: 8273127

Claim:
A spinal fusion device comprising: a single U-shaped load bearing device configured to fit between two adjacent vertebrae and having an open end configured to receive a retention device; a retention device configured to be secured to at least one of the adjacent vertebrae to prevent migration of the load bearing device, wherein the retention device has a height that is less than the height of the fusion bearing device, wherein the retention device is oval-shaped having a front portion and a rear portion that together form a hollow center portion adapted to receive a material to enhance spinal fusion and wherein the U-shaped load bearing device and the retention device fit together to form a generally round profile that fits within a vertebral body; and two or more fastening devices for securing the retention device to at least one of the adjacent vertebrae, wherein the retention device includes bores for receiving the fastening devices, wherein a first bore is generally angled toward the top of the fusion device so that a first fastener is configured to contact an upper vertebral body when inserted through the first bore and wherein a second bore is generally angled toward the bottom of the fusion device so that a second fastener is configured to contact a lower vertebral body when the second fastener is inserted through the second bore.