Orthopaedic done screw apparatus

Details Orthopaedic done screw apparatus Orthopaedic done screw apparatus

1998-08-06

1999-11-23

Buiz, Michael

Surgery

Instruments

Orthopedic instrumentation

606 61, A61B 1756

Patent

active

059892552

ABSTRACT:
A bone screw apparatus and method of implantation provides a bone screw having an elongated shaft of an oversized length with proximal and distal end portions. The distal end portion of the shaft has a cutting head. The proximal end portion of the shaft is sized and shaped to accept a driver tool, such as a drill chuck. The shaft is externally threaded along a majority of its length. A pair of opposed longitudinally extending circumferentially spaced flat surfaces are provided along the shaft. A removable head with a central opening enables the head to slide along the shaft proximally to distally. A ratcheting mechanism prevents movement of the head along the shaft in but one direction. A central opening of the head is shaped to conform to the shaped surfaces of the shaft, so that the head and shaft can be rotated as a unit by engaging and rotating the head. The tool receptive surface portion of the head includes intersecting external surfaces of the head spaced radially away from the shaft during use.

REFERENCES:
patent: 5100405 (1992-03-01), McLaren
patent: 5250049 (1993-10-01), Michael
patent: 5395371 (1995-03-01), Miller et al.
patent: 5591207 (1997-01-01), Coleman

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