Ratcheting tibial and femoral guide

Details Ratcheting tibial and femoral guide Ratcheting tibial and femoral guide

1995-08-11

1997-03-25

Buiz, Michael Powell

Surgery

Instruments

Orthopedic instrumentation

606 98, 606102, 606 89, A61B 1758

Patent

active

056139713

ABSTRACT:
A bone drill guide having at least a first arm slidable within a bore of the body of the drill guide and a ratchet mechanism for locking the first arm and the first bore. The ratchet mechanism includes teeth on the first arm and a pawl biased along a first axis and having a continuous engagement edge for engaging the teeth of the first arm for any angular orientation of the pawl about the first axis. The continuous engagement edge is a curve in a plane transverse to the first axis for providing a substantially renewable point contact with the teeth. The recess includes side walls tapered towards the engagement edge to allow a narrow contact at the engagement edge and re-enforce face walls to absorb the axial forces of the guide.

REFERENCES:
patent: 4034746 (1977-07-01), Williams
patent: 4254763 (1981-03-01), McCready et al.
patent: 4344420 (1982-08-01), Forder
patent: 5000163 (1991-03-01), Ray et al.
patent: 5163940 (1992-11-01), Bourque
patent: 5312412 (1994-05-01), Whipple
patent: 5350380 (1994-09-01), Goble et al.
patent: 5354300 (1994-10-01), Goble et al.
"PRO-TRAC", Acufex Micosurgical, Inc. Advertisement, one page, date prior to Aug. 11, 1995.
"Restore.TM. ACL Instrument System", DePuy Inc. brochure, 1992.

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