Bone screws and methods of use thereof

A fenestrated bone screw, comprising:

• a cylindrical screw body extending from a proximal end to a distal end along a longitudinal axis, the screw body including a first helical thread disposed at a first angular orientation relative to the longitudinal axis of the screw body, wherein the first helical thread forms a maximum screw body diameter;
• a screw head disposed at the proximal end of the screw body, the screw head including a second helical thread extending over an entire exterior surface of the screw head, the second helical thread forming a maximum head diameter, wherein the maximum head diameter is greater than the maximum screw body diameter;
• an interior channel extending longitudinally through the screw head and through at least a portion of the screw body;
• a plurality of radially-disposed delivery channels extending from the interior channel to openings at an exterior surface of the screw body;
• and
• a plurality of straight exterior grooves extending a length longitudinally along an exterior surface of the cylindrical screw body, interrupting portions of the first helical thread on the cylindrical screw body, and containing the openings of the plurality of radially-disposed delivery channels, each straight exterior groove of the plurality of straight exterior grooves extends longitudinally from a first position distal of a transition from the screw head to the cylindrical screw body to a second position proximally adjacent the distal end of the bone screw.

A fenestrated bone screw, comprising:

• a cylindrical screw body extending from a proximal end to a distal end along a longitudinal axis, the screw body including a first helical thread extending from an exterior surface of the screw body and wrapping around the longitudinal axis of the screw body, wherein the first helical thread forms a maximum screw body diameter;
• a screw head disposed at the proximal end of the screw body, the screw head including a second helical thread extending over an entire exterior surface of the screw head and forming a maximum head diameter, wherein the maximum head diameter is greater than the maximum screw body diameter;
• an interior channel extending longitudinally through the screw body from a proximal opening in the proximal end to a distal opening in the distal end;
• a plurality of radially-extending delivery channels disposed between adjacent crests of the first helical thread and extending from the interior channel to openings at the exterior surface of the screw body, wherein diameters of each of the radially-extending delivery channel of the plurality of delivery channels progressively increase from the proximal end of the screw body toward the distal end of the screw body;
• and
• a plurality of straight exterior grooves extending a length longitudinally along an exterior surface of the cylindrical screw body, interrupting portions of the first helical thread on the cylindrical screw body, and containing the openings of the plurality of radially-extending delivery channels, each straight exterior groove of the plurality of straight exterior grooves extends longitudinally from a first position distal of a transition from the screw head to the cylindrical screw body to a second position proximally adjacent the distal end of the bone screw.