Ratcheting bone screw

Details Ratcheting bone screw Ratcheting bone screw

1991-12-02

1992-12-01

Isabella, David

Surgery

Instruments

Orthopedic instrumentation

623 16, A61F 504

Patent

active

051676648

ABSTRACT:
A two piece bone screw having a separate head and shaft adapted for slidable engagement relative to one another. The head and shaft include a plurality of teeth which mutually engage to permit the head to shift relative to the shaft in only one direction. Therefore, under load, the head is shifted downwardly along the shaft to shorten the length of the screw in a ratcheting manner.

REFERENCES:
patent: Re33348 (1990-09-01), Lower
patent: 3990438 (1976-11-01), Pritchard
patent: 4456005 (1984-06-01), Lichty
patent: 4611581 (1986-09-01), Steffee
patent: 4759670 (1988-07-01), Linder et al.
patent: 4796612 (1989-01-01), Reese
patent: 5085660 (1992-02-01), Lin

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