Expandable corpectomy device
The instant invention is a longitudinally adjustable corpectomy device which fits within the intervertebral distracted channel. A ratchet mechanism allows for an extendable member to adjust to a longer length to accommodate a distracted channel. The ratchet type mechanism allows the members to move in a unidirectional movement to prevent the two members from contracting once expanded.
1. A corpectomy device comprising: a base member formed from a housing having a lower end with first and second side walls spaced apart and extending therefrom, with opposing end walls, at least one end wall having a centrally disposed U-shaped slot extending from the lower end along a length of the opposing end walls, said U-shaped slot having at least one edge having an engaging surface;
a lower endplate securable to an end of said base member, said lower endplate including an extension tab having at least one aperture for receipt of a mounting screw for fastening said lower endplate to bone;
an expansion member having first and second side walls and first and second end walls constructed and arranged to encompass said base member side and end wall and permit telescope expansion thereto, one said side of said expansion member including an aperture placed adjacent to said U-shaped slot;
an upper endplate securable to an end of said expansion member, said upper endplate including an extension tab having at least one aperture for receipt of a mounting screw for fastening said upper endplate to bone;
a biasing ratchet assembly mounted within said base member having at least one engagement prong operatively associated with said engaging surface and said expansion member;
wherein said aperture is sized to receive a pinion tool for use in extending said expansion member in relation to said base member, said engagement prong insertable into said engaging surface to prevent said expansion member from contracting once telescoped.
2. The corpectomy device according to claim 1 wherein said biasing ratchet assembly includes a biasing spring to maintain said prong against said engaging surface.
3. The corpectomy device according to claim 1 wherein said engaging surface are unidirectional teeth.
4. The corpectomy device according to claim 1 , wherein said U-shaped slot is further defined by a non-engaging edge adjacent said engaging surface.