Patent ID: 9095446
Filing Date: 2015-08-04
Classification: A61B,A61F

Abstract:
1. An expandable interbody fusion device for implantation into the intradiscal space between the opposing vertebral bodies in a spine, comprising: an upper plate having an outer surface configured to contact one vertebral body in a spine, and a hub having a mating surface generally opposite said outer surface, said mating surface including a shaped configuration; a lower plate having an outer surface configured to contact the other opposing vertebral body and an inner support surface, said lower plate having opposing spaced apart sidewalls and opposing spaced apart front and rear endwalls defining therewithin a fully bounded interior cavity, said support surface being within said interior cavity, said hub of said upper plate being received within said interior cavity with said mating surface facing said support surface and with at least a portion of said outer surface of said upper plate overlying a portion of one of said sidewalls, said front endwall or said rear endwall of said lower plate, said rear endwall defining therethrough a channel in communication with said interior cavity, said upper plate being movable in an expansion direction relative to said lower plate toward the one vertebral body; and at least one insert configured to be introduced between said upper plate and said lower plate through said channel into said interior cavity in an insertion direction that is substantially perpendicular to said expansion direction and supported by said support surface therewithin, said at least one insert having a complementary mating feature that upon receipt into said interior cavity provides resilient interlocking engagement between said mating feature and the shaped configuration of the mating surface on said hub.