Intramedullary nail system including tang-deployment screw with male interface

A device for interconnecting first and second fractured bone segments, the device comprising:

• a nail made of a material, having a proximal end, a distal end, an outer surface, a proximal shaped bore, an axial bore, and a transverse bore;
• one or more extendable nail tangs, each extendable nail tang having a first position substantially within the outer surface of the nail, and a second position penetrating the outer surface of the nail;
• a lag screw for insertion through the transverse bore of the nail, the lag screw having a proximal end, a distal end, and a circumferential outer surface;
• and
• one or more extendable lag screw tangs, each extendable lag screw tang having a first position substantially within the circumferential outer surface of the lag screw, and a second position penetrating the circumferential outer surface of the lag screw;
• a nail actuator screw, the nail actuator screw including:
• a screw drive head with a male shape, a proximal thread, a distal thread, and a screw stop between the proximal thread and the distal thread;
• a coupler, the coupler having a first interface and a second interface, the second interface mating to the drive head of the nail actuator screw;
• wherein rotation of the coupler rotates the nail actuator screw, which in turn cases the one or more extendable nail tangs to move from their first position to their second position;
• and
• wherein the circumferential outer surface of the lag screw further comprises anti-rotation flats, where the anti-rotation flats are planar surfaces having an angle with respect to a centerline axis of the lag screw, creating a taper by virtue of the anti-rotation flats near the distal end of the lag screw being a smaller distance apart than the anti-rotation flats near the proximal end of the screw;
• and
• wherein the angle of the anti-rotation flats with respect to a centerline axis of the lag screw is 0.5 degrees.

A device for interconnecting first and second fractured bone segments, the device comprising:

• a nail made of a material, having a proximal end, a distal end, an outer surface, a proximal shaped bore, an axial bore, and a transverse bore;
• one or more extendable nail tangs, each extendable nail tang having a first position substantially within the outer surface of the nail, and a second position penetrating the outer surface of the nail;
• a lag screw for insertion through the transverse bore of the nail, the lag screw having a proximal end, a distal end, and a circumferential outer surface;
• and
• one or more extendable lag screw tangs, each extendable lag screw tang having a first position substantially within the circumferential outer surface of the lag screw, and a second position penetrating the circumferential outer surface of the lag screw;
• a nail actuator screw, the nail actuator screw including:
• a screw drive head with a male shape, a proximal thread, a distal thread, and a screw stop between the proximal thread and the distal thread;
• a coupler, the coupler having a first interface and a second interface, the second interface mating to the drive head of the nail actuator screw;
• wherein rotation of the coupler rotates the nail actuator screw, which in turn cases the one or more extendable nail tangs to move from their first position to their second position;
• and
• wherein the circumferential outer surface of the lag screw further comprises anti-rotation flats, where the anti-rotation flats are planar surfaces having an angle with respect to a centerline axis of the lag screw, creating a taper by virtue of the anti-rotation flats near the distal end of the lag screw being a smaller distance apart than the anti-rotation flats near the proximal end of the screw;
• and
• wherein the anti-rotation flats are located at 0 degrees, 90 degrees, 180 degrees, and 270 degrees as viewed from the proximal end of the lag screw.