US 12,453,589 B2
Self-countersinking bone fastener and method for countersinking a bone fastener used in connection with an orthopedic implant
Sied Janna, Memphis, TN (US); Henry B. Faber, Memphis, TN (US); Nathaniel Kelley Grusin, Germantown, TN (US); and Charles R. Bennett, Memphis, TN (US)
Assigned to SMITH & NEPHEW, INC., Memphis, TN (US); SMITH & NEPHEW ORTHOPAEDICS AG, Zug (CH); and SMITH & NEPHEW ASIA PACIFIC PTE. LIMITED, Singapore (SG)
Appl. No. 18/569,442
Filed by Smith & Nephew, Inc., Memphis, TN (US); Smith & Nephew Orthopaedics AG, Zug (CH); and Smith & Nephew Asia Pacific Pte. Limited, Singapore (SG)
PCT Filed Jun. 15, 2022, PCT No. PCT/US2022/033592
§ 371(c)(1), (2) Date Dec. 12, 2023,
PCT Pub. No. WO2022/271504, PCT Pub. Date Dec. 29, 2022.
Claims priority of provisional application 63/213,531, filed on Jun. 22, 2021.
Prior Publication US 2024/0261009 A1, Aug. 8, 2024
Int. Cl. A61B 17/86 (2006.01); A61B 17/17 (2006.01); A61B 17/72 (2006.01)
CPC A61B 17/8605 (2013.01) [A61B 17/1725 (2013.01); A61B 17/725 (2013.01); A61B 17/8635 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A self-countersinking bone screw comprising:
a distal end portion, an intermediate shaft portion, a neck portion, an enlarged head portion, an external thread, and one or more cutting flutes extending from the enlarged head portion towards the distal end portion;
wherein:
the enlarged head portion includes a distal end, a proximal end, and a concave outer surface extending from the distal end toward the proximal end;
the neck portion includes a distal end and a proximal end, the neck portion configured to provide a transition from the shaft portion to the distal end of the enlarged head portion, the neck portion including a minor outer diameter that tapers from a minor outer diameter of the shaft portion towards the enlarged head portion;
the one or more cutting flutes include a distal end and a proximal end, the distal end of the cutting flute being positioned closer to the distal end portion of the bone screw than the distal end of the neck portion so that, in use, the distal end of the one or more cutting flutes contacts a patient's bone prior to the distal end of the neck portion; and
the neck portion includes an enlarged diameter thread, as measured from the minor outer diameter of an outer surface of the bone screw to a major diameter of the enlarged diameter thread, such that a height of the external thread in the neck portion is greater than a height of the external thread in the shaft portion.