Intramedullary fracture fixation device

摘要

An intramedullary fracture fixation device is provided which includes an intramedullary rod, a lag screw and a lag screw collar. The rod has a proximal end with a transverse bore extending therethrough. The lag screw has a distal end with coarse bone engaging thread elements and a proximal end with screw threads. When in use, the lag screw is substantially axially aligned with the transverse bore of the rod. The lag screw collar has an outer diameter sized to rotatably fit within the transverse bore of the rod. The collar also has an inner diameter and internal screw threads adapted to cooperate with the screw threads of the proximal end of the lag screw. The lag screw collar may have an increased outer diameter at one end thereof which is at least slightly larger than a diameter of the transverse bore of the rod. The device preferably includes a longitudinal bore which extends through the proximal end of the rod so as to open into the transverse bore. The longitudinal bore is preferably angularly offset with respect to a longitudinal axis of the proximal end of the rod. The device also preferably includes a set screw which is adapted to be secured within the longitudinal bore of the rod with a distal end thereof extending at least partially into the transverse bore of the rod so as to engage the collar when the collar is disposed within the transverse bore.