Patent ID: 6106292
Filing Date: 2000-08-22
Classification: A61C,Y10T

Abstract:
A dental drill formed of a substantially solid elongate body, the drill comprising:(a) a longitudinal shank having an axially disposed irrigation channel;(b) a working portion having an annular boss, a neck of reduced radius relative to said boss, and a cutting region disposed distally of said neck, said cutting region including at least four axi-symmetric flutes formed upon lateral surfaces thereof, each of said flutes defining co-axial peripheral profiles, each of said flutes separated by substantially co-axial channels, said working portion of said drill having an irrigation channel extending the entire length thereof and having at least one outlet within each of said channels, said one outlet of each channel located proximally to a distal tip of said working portion, said tip comprising a surface formed integrally and continuously with ends of said flutes and channels; and(c) a fluid-tight unidirectional baffle formed between opposing press-fittably complemental surfaces of said shank and working portion, inclusive of said irrigation channels thereof, said baffle defining a one-way interior valve situated within said irrigation channels at an interface thereof, to thereby preclude proximal fluid backflow within said channel of said shank during use of the dental drill.