Anterior expandable spinal fusion cage system
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United States of America Patent
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-
Nov 23, 2004
Grant Date -
N/A
app pub date -
Apr 18, 2000
filing date -
Apr 18, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fenestrated, hollow intervertebral cage containing a packed, harvested bone graft for fusing adjacent vertebrae together while maintaining or correcting the angular alignment and balance of the spine. Use of the device for an anterior interbody fusion results in a fused bone segment having a predetermined fixed angular orientation. The apparatus has a cage unit adjustably coupled to an expansion cap, and an adjustable wedge to support the adjacent vertebrae with facing surfaces at a predetermined angle relative to each other. A connecting bolt may be threaded or fixed to the rear of the cage unit. In certain embodiments, the cage unit and expansion cap are interlocking. Also in certain embodiments, especially utilizing round cages, the expansion cap may also include upper and lower horizontal bone-supporting surfaces and an anterior recess for receiving fasteners. A pair of independently adjustable cage units can be fixedly intercoupled by a link.
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