Expandable corpectomy device

A corpectomy implant device for retaining bone fusion material comprising:

• a first cavity defining member having first opposing side walls spaced apart and integrally connected by a first bottom wall, and having a first end plate secured along a bottom edge of each said first side walls and said first bottom wall;
• a second cavity defining member having second opposing side walls spaced apart and integrally connected by a second bottom wall, and having a second end plate secured along the bottom edge of each said second side walls and said second bottom wall;
• said first and second cavity defining members being constructed and arranged for telescopic engagement to define an open-topped cavity of adjustable length;
• at least one fixation means for securing a first member side wall to a juxtaposed second member side wall;
• and
• a lid constructed and arranged to overlie said cavity and said at least one fixation means, said lid having a first crossplate having an end edge for engaging said first end plate and a second crossplate having an end edge for engaging said second end plate, said first and second crossplate constructed and arranged for telescopic engagement to form an adjustable length substantially equivalent to the length of said open-topped cavity;
• wherein said first crossplate is secured to said second crossplate to close said open-topped cavity;
• whereby bone fusion material is retained within said cavity.