Patent ID: 7491203

Claim:
An adjustable drill for use in implanting orthopedic compression screws, comprising: a shaft member having a primary drill bit extending proximally from a distal end, a sleeve member having a countersink drill bit extending proximally from a distal end, said sleeve member having a lengthwise sleeve member bore therethrough, said shaft member slidingly disposed in said sleeve member bore in a non-rotatable relationship such that said primary drill bit extends from a distal end of said countersink drill bit and said countersink drill bit encircles said primary drill bit, said shaft member having a plurality of stop recesses for use in selecting a drill depth, and a stop member associated with said sleeve member, said stop member positioned and configured to selectively lock said shaft member and said sleeve member in a fixed relationship to thereby establish a selected drill depth, said stop member comprising a compression sleeve on a proximal end of said sleeve member and a locking collar configured to compress said compression sleeve, said compression sleeve comprising a plurality of adjacent tines, each said tine having a stop tab formed along an inner surface thereof, said locking collar including a bore having an inner thread for engaging a tine thread on said plurality of tines and a frusto-conical tine deformer configured to deform said tines for selective engagement of said stop recesses, said frusto-conical tine deformer being proximal to said cylindrical threaded bore, said collar including a knob for use in threading said collar onto said tine thread, said knob including a knurled surface and diametrically opposed flat portions, to assist in rotating said collar onto said tine thread.