초록 ▼

An expandable intervertebral implant includes two separate shells having corrugated mating surfaces which resist compression and shifting when the parts are distracted by a special installation tool. The shells include two planar wings which provide a large bearing area against adjacent vertebral en

An expandable intervertebral implant includes two separate shells having corrugated mating surfaces which resist compression and shifting when the parts are distracted by a special installation tool. The shells include two planar wings which provide a large bearing area against adjacent vertebral endplates to prevent the implant from sinking into cancellous bone.

대표청구항 ▼

[ I claim:] [1.]1. An expandable intervertebral fusion implant comprisinga pair of shells adapted to be assembled to form a hollow body, each of said shells comprising an arcuate central portion, a pair of wings extending in opposite directions from opposite edges of said central portion, and a pair

[ I claim:] [1.]1. An expandable intervertebral fusion implant comprisinga pair of shells adapted to be assembled to form a hollow body, each of said shells comprising an arcuate central portion, a pair of wings extending in opposite directions from opposite edges of said central portion, and a pair of parallel side walls extending in a common direction from respective outer edges of the wings, andmeans on the shells for permitting unidirectional expansion of the implant from a retracted initial height to an expanded installed height,wherein each of said wings has a width equal to at least 20% of that of the implant.