Patent ID: 8419733

Claim:
Apparatus for external fixation of bone fragments, wherein the apparatus comprises: at least two inner frame members including a straight section having an inner surface, an outer surface, and a plurality of pin mounting structures, wherein each pin mounting structure includes an internal mounting surface, an aperture extending from the internal mounting surface to the inner surface, and a threaded surface extending from the internal mounting surface to the outer surface, wherein the internal mounting surface, the aperture, and the threaded surface are aligned coaxially along an axis of the pin mounting structure, and wherein the axes of adjacent pin mounting structures within the plurality are each separated along a length of the straight section by a first separation distance; an outer frame member comprising an arcuate section, an attachment section at each end of the arcuate section, and a straight section extending in a forward direction from an end of each of the attachment sections, wherein each of the attachment sections has an inner surface, an outer surface, and two attachment holes, wherein each attachment hole extends along an axis from the inner surface to the outer surface, wherein the axes of the attachment holes are separated along a width of the attachment section by the first separation distance, wherein each of the straight sections has an inner surface, an outer surface, and a plurality of pin mounting structures, and wherein the outer frame member is attached to each of the at least two inner frame members with the two attachment holes of each attachment section aligned with two adjacent pin mounting structures within a respective inner frame member; at least four attachment bolts, each extending through one of the attachment holes to engage the threaded surface within one of the adjacent pin mounting structures, wherein the inner frame members are each attached to one of the attachment sections of one of the outer frame members using two of the attachment bolts; and at least one pin assembly including a pin holder, a bone pin, and a clamping member, wherein the clamping member engages the threaded surface of a pin mounting structure in the plurality of pin mounting structures to hold the pin holder in place within the internal mounting surface, and wherein the pin holder holds the bone pin.