Patent ID: 8657857

Claim:
A bone fixation device comprising a screw for mounting in a bone part with an exposed head projecting from the bone; a housing on the head of the screw with a clamp for a fixation rod mounted on a plate extending from each of opposite lateral sides of the housing, each plate being rotatable about a lateral axis relative to the housing and having a support surface extending in a plane parallel to the lateral axis, and each clamp being rotatable on a respective support surface about an axis perpendicular to the lateral axis to provide universal movement relative to the housing; and mechanisms for closing the clamps, for locking each plate against rotation about its lateral axis, and for locking each clamp against rotation about its perpendicular axis, and thereby fix rods in the clamps relative to the device, wherein each clamp has an outer jaw and a movable inner jaw, and wherein the locking mechanism for each clamp comprises an element of the housing for engaging the inner jaw to move it towards the outer jaw and secure a fixation rod therebetween.