Patent ID: 6319005
Filing Date: 2001-11-20
Classification: A61C,Y10T

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