Expandable implant for inter-vertebral stabilization, and a method of stabilizing vertebrae
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United States of America Patent
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Feb 18, 2003
Issued Date -
N/A
app pub date -
Apr 9, 2001
filing date -
May 11, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An expandable intervertebral implant for stabilizing adjacent vertebrae includes first and second opposed and operatively connected shells. Each one of the shells has a plurality of engaging members that are interdigitated with a corresponding plurality of engaging members of another of the shells. The implant also includes at least one extrusion opening and a cavity for containing osteogenic material. As one shell is moved relative to the other shell with a threaded actuator operatively connecting the shells, a volume of the cavity decreases and osteogenic material is extruded through the extrusion opening. A cross section of the implant at one or both ends thereof has a curvalinear shoulder for improved support of the vertebrae during bony growth and fusion of the vertebrae.
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