Patent ID: 8241358

Claim:
A spinal interbody device comprising: a first curved linkage having a first end and a second end, the first and second ends each having a first end surface and a second end surface recessed from the first end surface, each first end surface having a ridge and each second end surface having a groove; and a second curved linkage having a first end and a second end, the first and second ends each having a first end surface and a second end surface recessed from the first end surface, each first end surface having a ridge and each second end surface having a groove; the first end of the first curved linkage and the first end of the second curved linkage pivotally coupled to one another at a first pivot junction defining a first pivot axis and the second end of the first curved linkage and the second end of the second curved linkage pivotally coupled to one another at a second pivot junction defining a second pivot axis to define movement between a collapsed position of the spinal interbody device whereby the first and second curved linkages have a first radial dimension and an expanded position of the spinal interbody device wherein the first and second curved linkages have a second radial dimension that is greater than the first radial dimension; wherein the ridge on the first end surface on the first end of the first curved linkage and the groove on the second end surface on the first end of the second curved linkage extend co-axial with the first pivot axis and co-act to inhibit the expansion of the first curved linkage relative to the second linkage; wherein the groove on the second end surface on the second end of the first linkage and the ridge on the first end surface on the second end of the second curved linkage extend co-axial with the second axis and co-act to inhibit the expansion of the first linkage relative to the second linkage.