Rotationally ratcheting bone screw

Details Rotationally ratcheting bone screw Rotationally ratcheting bone screw

1998-03-23

1999-12-07

Buiz, Michael

Surgery

Instruments

Orthopedic instrumentation

A61B 1756, A61B 1758, A61F 230

Patent

active

059975385

ABSTRACT:
A rotationally ratcheting bone screw including a body having a distal end formed with an engagement tip for engaging bone tissue, and a shaft formed with a unidirectional stop. The bone screw further includes a fastening element formed with an opening complementally configured to receive the shaft and responsive to relative rotation between the shaft and fastening element to axially advance along the shaft. The fastening element includes a rotationally sensitive ratchet element to cooperate with the stop and inhibit relative counter-rotation between the shaft and the fastening element.

REFERENCES:
patent: 676678 (1901-06-01), Ellifrits
patent: 829216 (1906-08-01), Jones
patent: 1085041 (1914-01-01), Haughey
patent: 1547983 (1925-07-01), Weaver
patent: 5167664 (1992-12-01), Hodorek
patent: 5628752 (1997-05-01), Asnis et al.
patent: 5713708 (1998-02-01), Van DerDrift et al.

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