Patent ID: 7846190
Filing Date: 2010-12-07
Classification: A61B,B25B

Abstract:
1. A fixation apparatus for use in fixating bone, the fixation apparatus comprising: (a) a head portion comprising a plurality of outer wall sections at least partially surrounding a central hollow area with the outer wall sections having inner sides facing the central hollow area, the head portion having an inner bottom surface and a top end with the inner bottom surface disposed between the inner sides, and the top end of the head portion defining an opening between the outer wall sections with the inner sides of the outer wall sections tapered inwardly toward the central hollow area from the inner bottom surface to the top end; (b) an expander hub adapted for positioning at least partially within the central hollow area and seated at least partially on the inner bottom surface of the head portion; and (c) the expander hub being rotatable upwardly from the inner bottom surface toward the opening at the top end of the head portion to force at least one of the outer wall sections of the head portion outwardly to lock the fixation apparatus in a desired position.